TW201112062A - Drawing apparatus and program - Google Patents

Abstract

The disclosed rendering device can render smooth curves and rapidly comply with user input. On the basis of an inputted plurality of point sequences, interpolated points are generated and rendered on the screen of a display device (16) by the rendering device (10). The rendering device (10) is provided with a point sequence data acquisition unit (31), which acquires coordinates of each sample point configuring the inputted point sequence; an interpolation/smoothing processing unit (33), which, when the acquired number of sample points meets the aforementioned predetermined number in an interpolation/smoothing function that can calculate interpolated values on the basis of a predetermined number of sample points when said predetermined number of sample points exists, applies the aforementioned interpolation/smoothing function to the coordinates of said predetermined number of sample points, generating interpolated coordinates; and a rendering processing (35) means, which renders points at locations corresponding to coordinates interpolated on the screen of the display device (16).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swaying device and a drawing program for making a drawing based on input from a digital pen or the like. [Prior Art] There has been known a technique for obtaining positional information (coordinate values) of a digital pen on a tablet based on electromagnetic induction between a tablet pen and a tablet. A drawing device that applies such a technique to correspond to the movement of a pen and draws on the face of the display device has been proposed. For example, Patent Document 1 discloses a technique for correcting a line width desired by a user, and Patent Document 2 discloses a technique for displaying a natural brush drawing; Patent Document 3 discloses an implementation. The technique of mapping the pen pressure value. [Prior Art Document] (Patent Document) Patent Document 1: Japanese Laid-Open Patent Publication No. 2008-181515. Patent Document 2: Japanese Laid-Open Patent Publication No. Hei 2-4-13941 No. 1. Patent Document 3: Japanese Laid-Open Patent Publication No. 2002-196878. [Non-Patent Document] Non-Patent Document 1: "Based on the C language spline function (spHne function), data analysis CG, differential equation" Sakai Akira, Guan Ye Jingyou, Yoshimura and Mei 'Alpine Wenxiong, Tokyo Electric University Publishing Bureau Issued in 201112062. Non-Patent Document 2: "Bernstein-Bezier Methods for Computer-Aided Design for Free-Form Curves and Surface" William J. Gordon, Richard F. Riesen Feld, Journal of the Association for Computing Machinery, V〇l. 21, no.2 , April 1974, issued in April 1974. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] Further, the position information on the tablet is given a coordinate value for a point constituting a point, that is, it is given in the form of a discrete value. Thus, it is a necessary technique to smoothly connect the interpolation techniques between discrete values. As such an interpolation technique, a spline function (for example, a non-patent document) is well known. For example, in the B-spline function (B_Spiine), the number of b-spline functions b (K-1) is applied to: Between the discrete point columns, i, K(x) (K-1) times spline function S(x) = Σ ai Bi- κ (χ) More specifically, for the given five- -(Xi'yi)(i=0, l'-.., N-1), αα satisfying the condition of yi=S(Xi). Alkali into ♦ π κ丨„ 'The sentence decided "丨, It is necessary to determine the point sequence to be input. Therefore, in the interpolation of the application B spring function, there will be a problem of poor traceability, that is, a problem that is drawn and formed, and which takes a lot of time. In the depiction, the coefficient is 箅 and the meditation e-line is used to connect the point s that has been interpolated by using the spline function. That is, the interpolated 201112062 point is also discrete on the display screen. Therefore, a straight line is used to further connect the points. Therefore, there is also a problem that it is difficult to reproduce a smooth curve. The present invention has an object of providing a drawing device and a drawing program, which can Further, the present invention has an object of providing a drawing device and a drawing program capable of drawing a smooth curve. [Means for Solving the Problem] The object of the present invention is to provide a drawing device according to the present invention. In the meantime, the drawing device generates an interpolated point based on the input plurality of dots, and draws the image on the screen of the display device. The drawing device is characterized by: a coordinate value obtaining means for acquiring The coordinate value of each sampling point of the input point sequence; the interpolation and smoothing means, when the number of sampling points obtained by the coordinate value obtaining means reaches a predetermined number in the interpolation and smoothing function, The interpolation and smoothing function is applied to the coordinate value of the sampling point of the predetermined number, and the interpolated coordinate value 'the characteristic of the predetermined number is generated in the case where the predetermined number of sampling points exist, the foregoing The interpolation and smoothing function is capable of calculating the interpolated value based on the predetermined number of sampling points; and the drawing means for drawing the dot on the surface of the display device In the preferred embodiment, the drawing means is configured to be shaped as follows: the interpolated and smoothed means are generated and interpolated. The position of the coordinate value is superimposed on the dot matrix of the surface of 201112062 that has been drawn on the display device, thereby drawing. In a preferred embodiment, the interpolated coordinate value is responded to. The points of the positions are partially overlapped. In another preferred embodiment, the points which are in response to the positions of the interpolated coordinate values are overlapped with transparency. In the example, the drawing device is configured such that the coordinate value obtaining means acquires a value indicating a writing pressure in a sampling point for configuring the input point sequence; and the interpolation and smoothing means The interpolation and smoothing function is adapted to represent the value of the pen pressure in the sampling point, and calculate a value indicating the interpolated pen pressure; the drawing means is performed on the interpolated coordinate value The position, which depicts the size corresponds to a value representing the inside by insertion through the pressure of the pen point. In a further preferred embodiment, the interpolation and smoothing means calculates the interpolated coordinates based on the obtained coordinate values and performs the operation of the following mathematical formula t as a multiplication accumulation of the B-spline function. Value (x(t), γ(1)), [Math 1] N-1 X (1)=Σ χ,Β^ K (t) i=0 N-1 Y (t) =Σ YiBi K (t) i=0 (where Xi and Yi are each the input point, the X-station and the Y-station of the i-th point, and Bi, K(t), which is the B_spline function of (K1) times; The parameter t ' is taken in the following range for the !th coordinate value: ^ St < i + l (i = 〇, 1, ..., meaning 2)). 201112062 In another preferred embodiment, the above interpolation and smoothing means performs the following mathematical expression 2 calculation based on the obtained coordinate value as a multiplication accumulation of the B-spline function, J. Iida, The coordinates (X(1), Y(t)) inserted in the work and the value p(1) indicating the pen grinding,

[Mathematical formula 2J N-1 X(1)=Σ X丨Β|·, κ(1) Ν-1 ΥιΒ,.

γ (t) =Σ Ρ (t) ΙΗ =Σ

(where m, each is the input point, the i-th point...the Y-mark and the Y-coordinate and the value of the pen pressure...i K(1), which is (four) times the Β spline function; again, the parameter t, for the For a coordinate value, it is within the following range: is t < i + 1 (i = 〇.....) 〃 again, in the preferred embodiment, when the specified input sampling point of the specified range of memory At other sampling points, the coordinate value obtaining means is configured to remove the input sampling point from the acquired sampling point. Further, in a preferred embodiment, when the point of the interpolated coordinate value is indicated In the predetermined range, when there is a point indicating another interpolated coordinate value, the "description means" is configured to remove the point indicating the interpolated coordinate value from the drawing object. The purpose is based on providing a rendering program, 201112062. The drawing program is used to generate an interpolated point based on the input plural point in a computer having an input device and a display device. .4 on the screen of the display device, the characteristics of this depiction program The computer functions as the following means: a coordinate value obtaining means for obtaining a coordinate value for each sampling point of the input point sequence; and an interpolation and smoothing means for obtaining the means based on the coordinate value When the number of sampling points obtained reaches a predetermined number in the interpolation and smoothing function, an interpolation and smoothing function is applied to the coordinate value of the predetermined number of sampling points to generate an interpolated coordinate value. The feature of the predetermined number is that when the predetermined number of sampling points are present, the interpolation and smoothing function can calculate the interpolated value based on the predetermined number of sampling points; The point is drawn on the screen of the display device at a position corresponding to the interpolated coordinate value response. In a preferred embodiment, the drawing means is configured to be interpolated and smoothed by the aforementioned interpolation. The point generated by the means and the position of the interpolated coordinate value response is superimposed on the dot column already drawn on the surface of the display device, thereby drawing. In the embodiment, the point of the position of the interpolated coordinate value response is partially overlapped. In another preferred embodiment, the interpolated coordinate value is compared with the foregoing In another preferred embodiment, the drawing device is configured as the following 201112062 form: the coordinate value obtaining means obtains the "forms the aforementioned input point column" The value of the pen pressure in the sampling point; the interpolation and smoothing means, wherein the _, the smoothing function is applied to the value of the pen pressure in the sampling point, and is calculated to represent the interpolated pen pressure The value of the above-described drawing means that a point whose size corresponds to the value indicating the interpolated pen pressure is drawn at the position indicated by the interpolated coordinate value. [Effect of the Invention] According to the present invention According to the invention, a drawing device and a drawing program can be provided which can quickly track the user's input. Further, according to the present invention, it is possible to provide a drawing device and a drawing program which can draw a smooth curve. [Embodiment] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a block diagram showing the configuration of the drawing device of the embodiment. As shown in Fig. 1, the drawing device i of the present embodiment includes cpu 11, ROM 12, RAM 13, input unit 丨4, auxiliary memory device 丨5, display device 16, and tablet 1 7. The CPU 11' performs various processes such as control of the entire drawing device 1 and acquisition of coordinates of a point at which a point pen is input to the dot column of the tablet 17 using a digital pen (stylus pen) 18, based on the acquired coordinate value. The calculation processing of the coordinate value of the drawing point is displayed on the screen of the display device 16 or the like. 201112062 ROM 12 'The storage is executed by the CPU !!, and the following various processing programs are specified, for example, the coordinate value of the point of the point of the dot column of the king tablet 17 is calculated using the digital pen 8 The coordinates of the coordinates of the target point (the object to be continued) are not displayed on the screen of the display device 16 or the like. Alternatively, the above program may be stored in the auxiliary memory device 15 t. , remembers the program that was read from the 12, or the data generated during the process. As will be described later, in the present embodiment, various data of 1 or less are stored in the RAM 13: coordinates indicating the point at which the digit pen 18 is input to the dot column of the tablet η, the coordinate value of the point generated during the interpolation process, and Draw the coordinates of the point, etc. The input unit 14 includes a keyboard, a mouse, and the like. The auxiliary memory device 15 is constituted by, for example, a hard disk device or an SSD (s〇uds (10) Drive, a solid state drive). Further, in the present embodiment, the CPU u also includes a Gpu (graphics processing unh), a force energy such as a calculation process of the coordinate value of the point to be drawn based on the obtained coordinate value, and a screen displayed on the display device 16. Drawing processing, etc. Of course, it can also be independent of cpu u and has a GPU. As shown in Fig. 2, the tablet 7 is arranged to overlap with the display device 16. However, it is not limited to this state, and the digit 17' can also be separated from the display: set 16 configuration. The tablet 17' can obtain the plane coordinates (χ coordinates and γ coordinates) in which the digital pens 18 are located, based on electromagnetic induction with the digital pen (tip pen) 18. In addition, the method of obtaining the coordinates is not limited to electromagnetic induction, and the method of reading the coordinates by using the resistive film method, the ultrasonic method, or the combination of the optical detector and the image processing can be used. In addition, the actual (four) utiw pays the value of the pen pressure on the digital board caused by the digital pen 18 . This allows the value of the pressure sensitive element built into the pen to be obtained by the electromagnetic transfer action, and the pressure sensing film or the like disposed in the tablet 17 can also be used. Therefore, in the embodiment, when the digital pen 18 is moved on the tablet 17 (on the display device 而) and characters or graphics are drawn, the input on the display device 16 is displayed based on the number (4) 执Graphics and so on. In addition, the inscription of the digital pen 18, the movement of the 5, can also be replaced by a mouse operation or the like. [Summary of Processing] Fig. 3 is a functional block diagram of the performance device of the present embodiment. Fig. 4 is a flow chart showing an example of the main flow executed in the drawing device of the embodiment. As shown in Fig. 3, the striking device 1A includes a point-of-sales acquisition unit 31, an interpolation processing unit 32, a pre-rendering processing unit 34, and a green processing unit 35. The various data generated by the dot data acquisition unit 31, the interpolation processing unit 32, and the pre-render processing unit 34 are stored in the memory unit ★ the point data acquisition unit 31, and receive the digital pen 17 from the tablet 17 The three-dimensional data of the position (x coordinate, γ coordinate) and the value of the dust generate point data and memorize it to the memory unit 36. The interpolation processing unit 32 includes interpolation: the smoothing processing unit 33, based on the coordinate value of the point indicated by the point data, executes the lamp interpolation processing to generate a series of interpolated coordinate value groups and memorizes them to the memory = unit%. The drawing pre-processing unit 34 discards the coordinate value of the point to be drawn based on the set of the center values stored in the memory unit %. The rendering processing unit 3$ displays a complex point on the screen of the display device 16 based on the calculated coordinate value ' (point 201112062 column). Further, the coordinate values and the like calculated in the respective components are stored in the memory unit 36 for use in subsequent processing. In the present embodiment, the functions of the point data acquisition unit 3, the interpolation processing unit 32, the pre-rendering processing unit 34, and the rendering processing unit 35 are mainly realized by cpu η. Further, the memory unit 36 corresponds to, for example, the RAM port 3 and the auxiliary memory device 15. Further, when the Gpu is separately provided in addition to the CPUU, part of the functions of the point data acquisition unit 3, the interpolation processing unit 32, the pre-rendering processing unit 34, and the rendering processing unit 35 can be replaced by Gpu. As shown in Fig. 4, in the drawing device 1 of the present embodiment, when the power is turned on or the instruction indicating the start of drawing is given from the input unit 14, the main flow is started, and the steps 402 to 405 described later are executed repeatedly. The CPU 11 executes an initialization process (initialization process), which includes clearing the data in the RAM 13 or the screen of the display device 16 (step 4: once initialization processing (step 4〇1), . . . bundle, CPU 11 ( In particular, the point data acquisition unit 3 1) executes the point data acquisition processing (step 4〇2). Fig. 5 is a flowchart showing an example of the point data acquisition processing of the present embodiment. Acquisition Process] As shown in Fig. 5, the dot data acquisition unit 31 obtains a three-dimensional coordinate value (Χή' Υή, 卜) from the tablet 17, which indicates the digital pen 8 on the tablet 17 at the current time I. The position (the position of the sampling point) and the pen pressure (step 50 Ό ' '(xTi, Υίί) indicates the position of the digital pen 18, and h indicates the size of the pen pressure applied to the tablet 17 by the digital pen 18. If the previous obtained coordinate Value (coordinate value called at the moment) Χτμ, ^, Ρτμ) is the same as the obtained 12 201112062 coordinate value (XTi, YTi, Ρτ〇) (the judgment result of step 5〇2 is 々Ο, then return to step 501. When it is judged as N in step 5〇2. The distance between the adjacent points is calculated (step 503). In the present embodiment, the coordinate values (XTi, YTi, pTi) obtained in step 5〇 are taken as the kth set of coordinate values (^, ^, Pk). Calculate the distance between the S Hai position (Xk ' and the position (xk·, γ, ·,) in the (k_i) group coordinate value (Xkm) stored in the memory unit %. Also 'because of the position of the sampling point, It is taken every almost fixed sampling period Δt: the distance it is obtained from, so it can be assumed that the sampling period ^ is used as the speed of the early time. Example> If Euclidean is used (Eu^ _) The distance is calculated as the distance 'the distance d (velocity v), as calculated by the following formula: d = ((Xk-Xk-i) 2 + (Yk-Yk.1) 2) W2 is not limited to Euclidean distance, you can also use other distances such as Metropolitan distance. ... point data obtained 胄 31, coordinate value %, Yk, Pk) as point data The portion (the data constituting the point of the dot row) is stored in the memory unit 36 (step 504). Next, the point data obtaining unit 31 determines that the point adjacent to ', pk) is the coordinate value (Xk i, Whether or not the point of Yk i,hi) is within a predetermined distance (step 5G5). Here, it is determined whether the distance d: d is below the predetermined threshold value ^. When it is determined in step 5〇5 When Yes, the CPU 11 removes the coordinate value (heart, l from the point data order) obtained this time (step 506). That is to say, the partial processing of the dot column is performed. When it is judged as N〇 in step 505, or step 5〇6 is executed, the point data acquisition processing is ended. Ding 13 201112062 [Interpolation processing] Once the point data acquisition processing ((4) 402) is completed, cpu丄 [, the interpolation processing is performed (step 4〇3). Fig. 6 is a flow chart showing an example of the interpolation processing of the embodiment. The CPU U (interpolation processing unit 32) performs a moving average process on the point data by referring to the point data. In the present embodiment, interpolation processing is performed. p 32 ' is used as the coordinate value (8), Yk, Pk of the kth point, and the coordinate value (xk' Yk, pk) from the coordinate value % 3, ^ 3, ^ 3) of the (fourth) point to the kth point is calculated. The average value of the ) is taken as the coordinate value (Xk, Yk, pk) of the new kth point. That is, the coordinate values of the 'new kth point are each taken as the following value.

Xk ~ ( Xk-3 + Xk.2 + Xk_, + Xk ) / 4 Yk = ( Yk-3 +Yk_2 + Yk-丨 + Yk)/4

Pk = (pk.3 + Pk-2 + Pk 丨 + Pk)/4 The moving average m processing will reduce the range of variation of the point column, that is, the processing for smoothing. Omit this processing. The interpolation processing unit 32 determines that the number of points that have been acquired is equal to or greater than the predetermined value (step 6G2), and is equal to or greater than the value (step call: interpolation, smoothing processing (step 603) In the present embodiment, the number of points after the η lamp 3rd spline function (spHne) processing is 4 or more, that is, Z. In step 602, it is determined that Yese is in step 6.

When it is broken to Yes, it is executed; ί thousand & k T is inserted, and the processing is performed (step 603). Fig. 7 is a flow chart showing an example of interpolation and smoothing processing in the present embodiment.第 斤 不 , , , , , , , , , , , , 在内 在内 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 The node is calculated and added (step 7〇2), and the added node operation function value is used (step 7G3). In particular, in the present embodiment, ===: from the "subdivided, parameterized value, and the B-spline function [Β-spline function] right (IC-1) next to the mathematical formula of β Definition. Bi. K(x) = (qi + K_qi)MK(x :屮, Μκ( here: qi, qi + i, 3 ' in qi, qi+i ..... The spline function is written as "κ(χ), ,..., qi+κ), q'+κ) 'for the following mathematical formula

Qi + κ (qi S q,+, ^..... For the difference between the order of q, the node of ~~ + is taken [Math 3] MK (lq) = (q — x)

And because: [Math 4J (x-q) q) - (- 1 q Β - spline function Bi.K (x) writing can be expressed as follows: 15 201112062 [Math 5]

Day (1)=(_1) (qi+K-qi) I

q j=〇 p (K -1) times of the spline function § (χ) Sun Jiang r chooses the B-spline function Bi κ (χ) as a basis for linear combination, which can be expressed as the following formula. [Math 6] S (χ) = α0Βο. κ (χ) +〇f Ν-1 =Σ Of , Β !=0 Ν'1 ΒΝ-1· Κ (X) Βι·κ (X) + ·. ( κ (X ) & (10) spline function, for example, for the given capital, : °), (Χΐ, :,,..., (Χ..., by calculating the satisfaction of Na (four), 1.... .Nl) The coefficient ^ is obtained. y 'where A, α means, A α [Math 7], y is the following A:

B, BB (X 0), (X !), Β 1. Κ Β^.κ (Χ 0), (χ ι). • _ · • · , βν. , βν. (x ), κ (χ«η ), · · · I βν_ BN-1. K (Xih) a- ^0 y = «Ν-, ^ _ As above, if the B_-like column is used, the stimulus _ and the function ' can be obtained by determining The number of points that have been entered is a few. However, stand. It is also thought that the interpolation process cannot be performed as long as all the 16 201112062 point columns have not been determined. [Interpolation operation of the B-spline function of the present embodiment] In the present embodiment, the B-spline function is applied to a basis function of a so-called Bezier curve, which is to be given n pieces of data. The point, which is used as a control point for determining the shape of the curve, is disclosed in Non-Patent Document 2, for example. For example, in the present embodiment, the following three values can be obtained for the three-dimensional coordinate values (X, ·, Yi, Pi) obtained in the point data acquisition processing of the present invention. [Math 8] N-1 X (t) = Σ Χ, Β, K (t) i = 0 N-1 Y (t) = Σ Υ, Β, K (t) i = 0 N-1 Ρ ( Ο =Σ Ρ,Β^ K (t) i=0 ' Yi 'Pi ' is the value of the X coordinate, Y coordinate and pen pressure of the i-th point in the point column input by the user, respectively, and Bi. K(t) is a K-order ((K-1) times) B-spline function. Also 'parameter t, for the ^th coordinate value, its value is in the following range: t<i +l(i = 0, 1.....Ν·2). From the obtained X(t), γ(1), and the coordinate value represented by "((1), Y(t) 'P(t))), It becomes the coordinate value after interpolation. In this embodiment, the number of the letter 17 201112062 is expressed by the media variable of the parameter t + i + i, the interpolated coordinate value, and the new ^ ^ ® Ih /- B ^ ^ 'coordinate value) is paid with the B-spline function, so at the stage where the B-spline function & post-column is obtained, the data point of the H-th calculation amount (10) data [ ^仃Interpolation operation 'In this embodiment, the dragon has been inserted, and the 闵 益 & 仃 仃 次 次 次 次 次 次 次 次 次 次 次 次 次 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃 仃Order 'At the time when the seatpost value γ0, P.)~(x3, Y3, D is sent to the seat at the h value (χ〇3), the interpolation, the second step 602, 6 are performed, and the monthlyization is performed. Processing (in the subsequent processing, 4 points are also used (coordinate values (Χμ, γ. 1, ρ, , 7Γ using 4 number processing, r(1) (Xi'Yi, Pi)) to execute the spline function: The value of the coordinates broadcasted by the internals. The interpolated seatpost value is stored in the memory section 36. Below the value, it will be interpolated by 4 points (the coordinate value (in Ρ〇)). Point, ('1 point table is not (X), y_i, Pj). [Pre-Drawing Process] Once the interpolation process (step 4〇3) is called, the pre-rendering process is executed (step PU11 (pre-draw processing) Displayed on the screen of the display device, two steps: "", the letter of the machine t is a column of n points (constructed by the object to be drawn). The figure shows the example of the description of the embodiment of the present invention. Flowchart. If the first 曰 曰 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (χΗ出,以The start point and the end point are calibrated (the step is called because the start point and the end point in the 18 201112062 coordinates of the inserted point are necessarily drawn, so the above 2 · point is marked in step 801. Then, the pre-processing unit 34 is drawn. Refer to the position (Xj, yj) in the θth coordinate (χ, y_i' P_i) to calculate the first coordinate hi, force],

The distance between the positions (Xj -1, y』_ 1 ) in Pj · 1). Here, for example, the Euclidean distance can be calculated: Next, the 'pre-processing unit 34 determines whether the distance d is equal to or less than a predetermined threshold dth (step 8〇3), wherein the threshold value corresponds to the latest pen It is determined by the pressure value, the resolution of the display device, and the like. When it is judged as Yes in the step 8〇3, the coordinate value (Xj, yj, pj) is removed from the drawing target point ten (step 804). That is, the partial discarding process of the dot column is performed. The above steps 8〇3, 8〇4 are the same as steps 5〇5 and 5〇6 of Fig. 5. When it is judged as Yes in the step, or after the end of step 8〇4, the pre-processing unit is drawn, and the correspondence between the pen pressure value Pj and the point (d〇t) of the point to be drawn is performed (step 8〇5). Fig. 9 is a view showing an example of a pen pressure and a point correspondence table in the present embodiment. As shown in Fig. 9, the 'individual application pattern towel, for each range of prescribed pen pressure values', is associated with a table d indicating the value d of the point size indicating the point to be drawn, for example, in the auxiliary memory device. 15. In the pre-stroke processing 34, the table is copied to the RAM 13. In the table 9 of the present embodiment, the range of the pen m is linearly changed from the value indicating the dot size. For example, 'in the 256 stage (1 to 256) 'If the pen pressure value is b', the value of the point size is "1" (reference symbol 9〇1), and if the pen pressure value is 33 to 64, it indicates The value of the point size is "2" (reference character i 9〇2). Of course, it is not limited to such a linear case', and the value of the point 2011 1912062 may be changed non-linearly. Further, the pen pressure and the point size are of course not limited to the correspondence shown in Fig. 9. Further, since the drawing element to which the anti-aliasing process has been applied is used, the pen pressure and the dot size (pixel cluster) do not necessarily correspond explicitly. The drawing pre-processing unit 34 refers to the table in the RAM 13 and calibrates the value D indicating the point size corresponding to the pen pressure value Pj. Thereby, the target point data (Xj, yj, D) composed of the values Xj and y representing the position and the value D indicating the point size can be obtained. The obtained drawing target point data (Xj, heart, is stored in the memory unit 36. The pre-rendering processing unit 34 repeats the processing of steps 802 to 805 until the end point. Thereby, it is possible to obtain an appropriate interval between them. The data of the dth point is determined, and the distance is determined by the latest pen pressure value or the resolution of the display device, etc. [Drawing process] Next, the drawing process (step 405 of Fig. 4) will be described. In the embodiment, the drawing process reads the point of the drawing target point at the position (Xj, yj) indicated by the drawing target point, and draws a point of the large J indicated by D. Between the drawing target points, instead of connecting with lines having a certain width, a plurality of drawing object points are drawn at the most appropriate intervals on the face to express a curve or a straight line. In addition, in the present embodiment, the pre-rendering process is repeatedly executed. Thus, the drawing target point data generated in each pre-rendering process is used as a point having a predetermined transparency. Overlapping and not appearing on the screen to achieve the specified color density. For example, the color density (transparency) depicted on the object point of the drawing is 2011. The color density (transparency) depicted on the object is predetermined. Since the point size D corresponds to each other, the drawing target point is drawn in accordance with the size of each of the pen pressures. Further, it is also possible to overlap the selected part of the drawing target point without overlapping all the drawing target points. Fig. 10 is a view schematically showing the drawing process of the present embodiment. For example, 'the point column 1 to 1 of the drawing point can be obtained by inputting to the four point columns Pi 3 to Pi of the tablet i 7 . Similarly, the point columns 11〇2, 11〇3 of the drawing target points can be obtained from the four dot columns ^ 2 pi + 丨, Ρ_-ι~Pi+2, Pi 卩... (not shown). 1104. In the present embodiment, the curve 1010 displayed on the screen of the display device 16 is formed by superimposing the dot rows 1001 to 1004. For example, the field 1013 of the curve 1〇1〇, the dot column 1〇〇1 to 1 〇〇3 overlaps, while field 1014 'lines point to his field ( For example, the overlap of 1002 to 1004. It should be understood that the fields 1011, 1〇12, and 1015) are similarly overlapped with the dot array and other dot arrays shown in the figure. Further, this embodiment In the process of repeating steps 4〇2~4〇4, the four points of the input are generated, and the point column of the object point is sequentially generated. In the case of 疋, the input of the point column can be almost completely (that is, Referring to the action of the digital pen), the curve formed by the object to be drawn is reproduced almost instantaneously in accordance with the thickness of the pen pressure. The first " diagram indicates that the user moves the pen 18 on the tablet 17, and the result A diagram of an example of a list of points f obtained by the point sequence obtaining unit 31. Further, the graph 12 is not displayed in the graph of the processing of the present embodiment, and is displayed on the surface of the display device 16 in the 21 201112062 interpolation processing unit 32 for interpolation and smoothing, and then in the pre-processing portion μ. The dot column is appropriately discarded in part, and the drawing target point 35 superimposes and displays the drawing target point to reach a predetermined color density. As a result, the movement of the digital pen 18 is reproduced by the curve. According to the present embodiment, when there are already a number of input points (sampling points) necessary for performing interpolation, an interpolation and smoothing function capable of calculating the interpolated values based on the necessary number is used to calculate The coordinate value used to form the point of the interpolated point sequence. Thereby, it is not necessary to wait until all the point lists have been obtained before starting the processing, and the calculation can be performed at the stage of obtaining the sampling points necessary for the interpolation. Further, according to the present embodiment, the above-described point sequence (based on the interpolated coordinate value obtained based on the operation performed at the stage where the number of sampling points necessary for performing interpolation is obtained) is obtained. The drawing is superimposed on the dot matrix already displayed on the screen of the display device. By borrowing &, the adjacent points do not need to be connected by a straight line, but a smooth curve can be reproduced. [Others] The present invention is not limited to the above embodiments, and various changes can be made in the scope of the invention as set forth in the appended claims, and such modifications are of course included in the scope of the invention. For example, in the embodiment, the position is obtained as a point sequence in a state in which the digital pen is in contact with the tablet, but the present invention is not limited thereto, and the digital pen is close to but not in contact with the tablet. It is also possible to obtain the position of the digital pen as a point. This embodiment can be realized by performing position detection according to the electromagnetic induction transmission between the digital board I?22 201112062 and the digital pen (inflammation pen) 18. In the case of the description, the coordinate values d, Yk, and D are obtained according to the plane coordinates (X coordinate, Y coordinate) where the digital pen is located and the pen pressure, but the digital pen can be detected in addition to the pen pressure. The slope is Ak, and the coordinate value (Xk ' Yk ' Pk ' Ak) is obtained. At this time, the inclination value of the digital pen a can be obtained as follows, similarly to the mathematical expression of Mathematical Formula 8, and the inclination value after interpolation can be obtained as follows. A(t)= Σ Α;Β,. K(t) Furthermore, by using the slope value and the element to be drawn (for example, the size of the point can be the same as the pen pressure, or other colors such as color or dot density) Correspondence is made, and the depiction corresponding to the inclination of the digital pen is realized. Alternatively, the coordinate value (Xk, Yfc, Ak) may be obtained by using the inclination of the digital pen instead of the pen pressure. Further, in the above embodiment, the shape of the point to be drawn may be a circle or a groove. Of course, as long as the size can be determined corresponding to the pen pressure, 4 is another shape. Further, in the above-described embodiment, the value obtained by parameterizing the coordinate value corresponding to the distance d is multiplied and added to the B-spline function, and the interpolated coordinates are calculated to realize interpolation and smoothing. ‘However, the usable = interpolation and smoothing functions are not limited to the above functions, for example, the Shangss function is also applied. When the Gaussian function & day is used, if it is written in the same manner as the mathematical expression of Mathematical Formula 8, it can express the following mathematical expression. In addition, the parameters determining the shape of the Gaussian function are preferably sequentially considering the pen pressure ρ or 23 201112062 distance d and the like. X(t)=I XiG(t) Y(1)-Σ YiCi(t) Ρ(ί)=Σ PiG(t) /, to 疋-type function, can also use functions other than Gaussian function. Further, in the embodiment described above, as shown in Mathematical Formula 8, the interpolated coordinate values are calculated using the following mathematical formula. X(1)=Σ ΧΑ, κ(1) γ(1)=Σ YjBi, K(t) P(1)=Σ PiBj,K(t) According to these mathematical formulas, since the input point (sampling point) is used as the control point, the interpolated coordinates are used. The point sequence formed by the value does not pass through the sampling point. Yu Yu, as a better implementation, in order to make the note speed faster and the point column appear intermittent (when the distance d between the points forming the point column is large), the interpolation point column closer to the sampling point can also be calculated. Alternatively, the interpolated and smoothed coordinate values can be calculated using the following mathematical formula. X(t)=w(d) Σ XjBj. K(t) Y(t)=w(d) Σ YiBj. K(t) P(t)=w(d) Σ PjBj. K(t) , w(d) ' is a weighted value of the function value of speed (distance). Further, in the above-described embodiment, in the pre-drawing process, if the distance between the adjacent points is within a predetermined distance, the partial discarding process of the dot-column is performed (step 5 (Μ, 5 05), but this step may also be performed. [Brief Description of the Drawings] Fig. 1 is a block diagram showing the configuration of the drawing device of the embodiment. Fig. 2 is a perspective view showing the appearance of the drawing device according to the embodiment of the present invention. The functional block diagram of the drawing device of the present embodiment. Fig. 4 is a flow chart showing an example of the main flow executed by the drawing device of the embodiment. Fig. 5 is a view showing the point data obtaining process of the present embodiment. Fig. 6 is a flow chart showing an example of interpolation processing in the present embodiment. Fig. 7 is a flowchart showing an example of interpolation and smoothing processing in the present embodiment. Fig. 9 is a view showing an example of a pen pressure and a point correspondence table according to the present embodiment. Fig. 1 is a view schematically showing a drawing process of the embodiment. Fig. 11 is a view showing an example of the dot data of the embodiment. Fig. 1 is a view showing an example of a curve displayed on the face of the display device according to the process of the present embodiment. 25 201112062 [ Explanation of main component symbols] 10 Drawing device 18 Digital pen 11 CPU 31 Point data acquisition unit 12 ROM 32 Interpolation processing unit 13 RAM 33 Interpolation and smoothing processing unit 14 Input unit 34 Pre-processing unit 15 Sub-memory device 35 Processing unit 16 display device 36 memory unit 17 tablet 26

Claims (1)

201112062 VII. Patent application scope: 1. A drawing device that generates an interpolated point based on a plurality of input points and draws it on a screen of a display device. The drawing device is characterized by: a coordinate value obtaining means And obtaining a coordinate value for each sampling point of the input point sequence; the interpolation and smoothing means, the number of sampling points obtained by the coordinate value obtaining means reaches a predetermined number in the interpolation and smoothing function When the interpolation and smoothing function is applied to the coordinate value of the predetermined number of sampling points, the interpolated coordinate value is generated, wherein the characteristic of the predetermined number is in the sampling point where the predetermined number exists In the case of the interpolation and smoothing function, the interpolated value 丨 and the drawing means can be calculated based on the predetermined number of sampling points, and the point is drawn on the pupil surface of the display device and interpolated as described above. The position of the coordinate value response. 2. The drawing device according to claim 2, wherein the drawing means is configured to be responsive to the interpolated and smoothed handcuffs and the interpolated coordinate values. The point of the position is superimposed on the dot column already drawn on the screen of the aforementioned display device, thereby performing the tracing session. 3. As described in the scope of application of the patent application, the above description 27 201112062 means, in the form of the following: in the point of the position of the above-mentioned interpolated coordinate value response Prescribed - partially overlapping. 4. The drawing device according to claim 2, wherein the drawing means is configured to provide a position at which a position corresponding to the interpolated coordinate value is responded to. The transparency overlaps. The drawing device according to any one of the items of the present invention, wherein the drawing device is configured as follows: the coordinate value obtaining means acquires and indicates that the input is configured The value of the pen pressure in the sampling point of the point sequence; the interpolation and smoothing means are applied, and the interpolation and smoothing function is applied to the value indicating the pen pressure in the sampling point, and is calculated to represent the interpolation The value of the pen pressure; the foregoing drawing means, at the position indicated by the interpolated coordinate value, the size is corresponding to the value indicating the interpolated pen pressure. The drawing device according to any one of the items, wherein the internal # and the smoothing means perform the following mathematical expression 9 as a B_spline function based on the acquired coordinate value. The multiplication and accumulation are added, and the interpolated coordinate values (χ(1), Y(t)) are calculated, [Math. 9] 28 201112062 N-1 Χ(°-Σ x, B, K(t) i=0 N, 1 y (1)=Σ YiBi κ (1) i=0 (where Xi ' Yi ' is the input point, i The χ coordinate and the Y coordinate of the point, and Βι, κ(1), is the (four) second B_spline function; in addition, the parameter t ' is taken in the following range for the ith coordinate value: i $t<i+ l (i = 〇, 1, ..., n_2). 7. The device according to claim 5, wherein the interpolation and smoothing means are performed based on the obtained coordinate values. The operation of Mathematical Formula 10 is used to multiply and accumulate the 4 B-spline function, and the interpolated coordinate values (X(1), Y(t)) and the value of the pen pressure p(t) are calculated, [Math 10 N-1 X (1)=Σ xiBi. K (t) ρ Ν-·Σΐ=οΝ-Σ .ϋ =0 BB p The X coordinate and the Υ coordinate and the value of the pen pressure, and Bi K(t/ is ( The second B-spline function; again, the parameter t, for the second coordinate value, is in the following range: iSt<i+l(i = 〇, i.... 29 201112062 8 In the drawing device of any one of the above-mentioned claims, wherein the coordinate value obtaining means is configured to be used when the sampling point of the sampling point of the input is present at other sampling points The sampling point of the above input Removed from the obtained sampling point. 9. If the performance device described in any of the items in items i to 8 of the patent application is within the specified range of the point indicating the interpolated coordinate value, When the point of the other interpolated coordinate value is used, the drawing means is configured to remove the coordinate (four) point indicating the passage of the internal number from the drawing object. In a computer including an input device and a display device, an interpolated point is generated based on the input plural point and drawn on the top surface of the display device, and the drawing program is characterized in that the above-described brain is used as the following various means And functioning: a coordinate value obtaining means for obtaining a coordinate value for each sampling point of the input point sequence; and an interpolation and smoothing means for taking the number of sampling points of 2 according to the coordinate value obtaining means When inserting or smoothing a predetermined number in the function, the interpolation and smoothing function is applied to the coordinates t of the predetermined number of sampling points to generate an interpolated coordinate value, wherein the specified number of features When the predetermined number of sampling points are present, the interpolation and smoothing function can calculate the interpolated value based on the predetermined number of sampling points; and, L 201112062 &, 's hand'^ In addition, it draws a point on the screen of the display device at a position corresponding to the aforementioned interpolated coordinate value response. 11 · The drawing program described in the 10th patent scope 帛10, the "the above-mentioned drawing means" is configured as the following form: ι by the interpolation and smoothing means and the interpolated coordinates The point of the position of the value response is superimposed on the dot sequence already drawn on the screen of the display device, thereby drawing. 12·如U利|& Wai! In the drawing program described in item i, the drawing means I is configured to overlap a predetermined portion of the point of the position of the interpolated coordinate value response. 13. A drawing program as described in claim 12, wherein the drawing means is configured to adjust the position of the coordinate value with the interpolated coordinate value. Transparency overlaps on a °4. For example, please refer to the ^^, u Λ ... 巧^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The value acquisition means obtains the value of the pen pressure in the sampling point of the point column of the table; the heart constitutes the interpolation and smoothing means, and the interpolation is used to indicate the value of the pen in the sampling point. , ~, 'monthly function is appropriate' to indicate the value of the pen pressure inserted by the 2011 3112062; the above description means, at the position indicated by the interpolated coordinate value, the size is drawn Corresponding to 32 indicating the value of the aforementioned interpolated pen pressure