JPH06175777A - Method and device for generating brush-written style - Google Patents

Abstract

PURPOSE:To form a drawing locus approximating the handwriting of a brush-written style, a thick pen-written style, or the like by drawing the locus while not only gradually reducing the line width in the drawing position corresponding to an accelerated handwriting position but also gradually increasing the line width in the handwriting position corresponding to a decelerated handwriting position. CONSTITUTION:A speed information calculating part 4 receives coordinate position information from a coordinate detecting part 2 and reads the time of coordinate position information input from a time output part 3 and calculates the going direction of an input pen, the going speed, the acceleration as the variation of the going speed, the degree of change of the going direction, the pen start point, and the pen end point basing on coordinate position data of at least two points having time information. A drawing locus determining part 5 determines the line width of the locus of the pen in accordance with the calculation result of the speed information calculating part 4 and determines a brush-written style shape to be added to stroke start and end point parts and generates brush-written style locus forming information. A drawing locus display part 6 displays the drawing locus on a display device based on this information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing locus display method and apparatus for displaying a drawing locus that is electronically input using a pen input tablet or other online input device.

[0002]

2. Description of the Related Art In recent years, with the widespread use of facsimiles and electronic files, it has become common to electronically input, store, and communicate images, but as means for inputting characters and figures by handwriting. , A method of reading something written on paper or the like with an optical scanner or a method of directly electronically inputting using an input device such as a pen input tablet.

Generally, a user of an electronic drawing apparatus tends to prefer bold and powerful drawing from the viewpoint of drawing visibility and appearance. In fact, when transmitting handwritten characters or graphics by facsimile or the like, an image drawn using a bold-face writing instrument such as a felt-tip pen is often used instead of a thin-type writing instrument such as a pencil or a ballpoint pen.

Against the background of such user demands, a drawing locus display device has been developed which is capable of displaying an input drawing locus in bold type even in a device for direct electronic input with a pen. A conventional drawing locus display device of this type is configured as shown in FIG. 3, and includes an online input detection unit 31, a display attribute setting unit 32, and a drawing locus display unit 33. Here, the online input detection unit 31 detects the position and time of input data of an online input device, and the display attribute setting unit 3
2 is to set the display attribute of the trajectory to be drawn according to the input by the user. The drawing trajectory display unit 33 controls the display line width and the display shape according to the display attributes of the trajectory set by the display attribute setting unit 32.

In the conventional drawing locus display device constructed as described above, the user first asks the display attribute setting section 32 to draw a line width or end shape (drawing start and drawing end) before actual drawing. Set display attributes such as rounding or making a part square. On the other hand, in the drawing operation, first, the online input detection unit 31 detects the position and time of the data consisting of each point input by the online input device, and the drawing trajectory display unit 33 detects the online input detection unit 31. Based on the coordinate data of each point
A drawing trajectory is generated and displayed according to the display attributes set by the display attribute setting unit 32. In this way, even in the conventional drawing locus display device, it is possible to generate a drawing locus as if it were drawn by a bold writing instrument by adding width and shape to the handwriting of the thin character actually drawn by the operator.

[0006]

However, in the above-mentioned conventional method, the drawing shape is determined based on the display attribute designated in advance by the operator. In addition, components such as characters and figures that are input online, for example, in the case of pen input, from the time when the pen touches the input tablet (hereinafter referred to as "pen down") to the time when the pen leaves the input tablet (hereinafter referred to as "pen The line width or the shape near the start and end points can only be controlled in a constant unit of a series of coordinate points (hereinafter referred to as "up") (hereinafter referred to as "stroke"), and the line width changes slightly during the stroke. It was not possible to change the drawing shape in various ways.

Therefore, in the above-described conventional method, even if the operator draws with a brush stroke, for example, with a brush stroke, it is not possible to form a brush stroke corresponding to the brush stroke, and the operator's personality is adjusted. I couldn't draw brushstrokes. The present invention has been made in view of such circumstances, and finely controls the drawing display shape such as the line width during stroke or the vicinity of the start point and the end point, and draws that approximates the handwriting of a writing brush or a bold pen type. An object of the present invention is to provide a writing brush writing method and a writing brush writing apparatus that can form a trajectory.

[0008]

In order to achieve the above object, the invention of claim 1 detects the contact position and time of a coordinate indicator on an input board, and based on the detected contact position and time. The step of obtaining the velocity on the handwriting of the coordinate indicator and the line width of the drawing area corresponding to the accelerated handwriting area are temporarily reduced, and the line width of the drawing area corresponding to the decelerated handwriting area is temporarily increased. And a step of drawing.

According to a second aspect of the invention, in addition to the method for forming a brush body according to the first aspect, based on the detected contact position and time,
The step of obtaining the moving speed at the starting point and the subsequent pen moving direction in the handwriting of the coordinate indicator, and drawing the brush shape at the starting point, which is determined according to the obtained moving direction and the moving speed at the starting point, at the drawing position corresponding to the starting point The method for forming a brush body is characterized by adding the step of

According to a third aspect of the present invention, the moving speed and acceleration at the end point in the handwriting of the coordinate indicator are based on the contact position and time detected by the brush forming method according to the second aspect.
And a step of obtaining a change in the moving direction in the handwriting before the end point, and drawing a brush shape at the end point, which is determined according to the moving speed and acceleration at the obtained end point and the change in the moving direction before the end point, at a drawing position corresponding to the end point. And a step of adding a writing brush.

According to a fourth aspect of the present invention, there is provided a first means for detecting the contact position and time of the coordinate indicator on the input board, and the velocity of the coordinate indicator on the handwriting based on the detected contact position and time. An arithmetic means, and a first drawing control means for temporarily reducing the line width of the drawing portion corresponding to the accelerated handwriting portion and temporarily increasing the line width of the drawing portion corresponding to the decelerated handwriting portion, And a writing brush forming device.

According to a fifth aspect of the present invention, in the writing brush forming apparatus according to the fourth aspect, the moving speed at the starting point in the handwriting of the coordinate indicator and the subsequent pen moving direction are further determined based on the detected contact position and time. A brush having a second calculation means to be obtained and a second drawing control means to draw a brush shape at a starting point, which is determined according to the obtained moving direction and a moving speed at the starting point, at a drawing position corresponding to the starting point. It is a body forming device.

According to a sixth aspect of the present invention, based on the contact position and time further detected by the brush forming apparatus according to the fifth aspect, the moving speed and acceleration at the end point in the handwriting of the coordinate indicator, and the front side of the end point. The third calculation means for obtaining the change in the moving direction of the handwriting, the moving speed and acceleration at the obtained end point, and the brush shape at the end point, which is determined according to the change in the moving direction in front of the end point, are set as the drawing position at the end point corresponding position A writing brush forming apparatus further comprising a third drawing control means for drawing.

[0014]

The function of the invention relating to the method for forming a brush body according to claims 4, 5 and 6 will be described. The operation of the invention according to the method for forming a brush body according to claims 1, 2, and 3 is basically the same as the operation of the invention for a brush body forming apparatus according to claims 4, 5, and 6, respectively. , Their explanations are omitted.

Each structure of the invention of claim 4 operates as follows. The first detection means detects the contact position and time of the coordinate indicator on the input board. The speed of the coordinate indicator on the handwriting is calculated based on the contact position and the time detected by the first calculation means. The first drawing control means temporarily reduces the line width of the drawing portion corresponding to the accelerated handwriting portion and temporarily increases the line width of the drawing portion corresponding to the decelerated writing portion. Thus, the invention according to claim 4 has an effect that the handwriting drawn by the pen is fleshed out based on the moving speed information of the coordinate indicator to form a drawing locus approximate to the writing brush.

According to a fifth aspect of the present invention, a second computing means and a second drawing control means are further added to the invention of the writing brush forming apparatus according to the fourth aspect, and the contact position detected by the second computing means is Based on the time, the moving speed at the starting point in the handwriting of the coordinate indicator and the subsequent pen moving direction are obtained. Further, the second drawing control means draws the brush shape at the starting point, which is determined according to the calculated moving direction and the moving speed at the starting point, at the drawing position at the position corresponding to the starting point. Thereby, in addition to the effect of claim 4, the invention of claim 5 increases or decreases the drawing line width based on new speed information of the moving speed at the starting point in the handwriting of the coordinate indicator and the subsequent pen moving direction. In addition, a shape similar to a writing brush is added to the drawing start point portion, and the pen locus is formed into a drawing locus similar to the writing brush.

According to a sixth aspect of the present invention, a third computing means and a third drawing control means are added to the invention of the writing brush forming apparatus according to the fifth aspect. The third computing means detects the contact position. Based on the time and the time, the moving speed and acceleration at the end point of the handwriting of the coordinate indicator and the change in the moving direction of the handwriting before the end point are obtained. The third drawing control means draws the brush shape at the end point, which is determined according to the change in the moving speed and acceleration at the obtained end point, and the change in the moving direction before that, at the drawing position at the position corresponding to the end point. As a result, the invention of claim 6 is newly added to the operation of claim 5 in addition to the movement speed and acceleration at the end point of the handwriting of the coordinate indicator and the change of the moving direction of the handwriting before the end point. Based on the speed information, it is possible to increase / decrease the drawing line width and to form the writing brush shape for the drawing starting point portion, and to add the writing brush shape to the drawing ending point portion. Therefore, there is an effect that the pen locus can be formed into a drawing locus that further approximates the writing brush.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a basic configuration diagram of a writing brush forming apparatus in one embodiment of the present invention. This writing brush type forming device
The drawing input unit 1, the coordinate detection unit 2, the time output unit 3, the speed information calculation unit 4, the drawing locus determination unit 5, and the drawing locus display unit 6 are provided.

The drawing input section 1 is for the operator to input a character or the like as image data by pointing. The drawing input unit 1 is usually composed of a coordinate indicator such as a stylus pen and a tablet which is an input board, but the input system may be any system such as electromagnetic induction, electrostatic induction, and optical encoder. . The coordinate detection unit 2
The coordinate of the position on the input board designated by the coordinate indicator is detected and the information is output to the speed information calculation unit 4. For example, when a combination of a pen and a tablet is used as an input device, the operator When the user traces on the input tablet with the pen, the signal generated by the detection point on the tablet is received, and the XY coordinate position of each detection point is calculated.
For convenience of explanation, the drawing input unit 1 and the coordinate information detection unit 2 are configured separately, but they may be configured integrally.

The time output unit 3 outputs the time to the speed information calculation unit 3. The speed information calculation unit 4 receives the coordinate position information from the coordinate detection unit 2, reads the time when the coordinate position information is input from the time output unit 3, and reads the coordinate position data of at least two points having the time information. Based on, the advancing direction of the input pen, advancing speed, acceleration which is the amount of change in advancing speed, degree of change in advancing direction and pen start point
Calculate the pen end point. The speed information calculation unit 4 includes a calculation unit that calculates the traveling direction and the like, and a storage unit that temporarily stores the calculated data and time data.

The drawing trajectory determination unit 5 determines the line width of the trajectory of the pen in correspondence with the calculation result of the speed information calculation unit 4,
Further, the brush body shape to be added to the stroke start point portion and the stroke end point portion is determined, and the brush body trajectory formation information is generated according to the determination. The drawing locus determination unit 5 includes a deciding element portion for performing the above-described determination and a brush body shape to be added to the start point portion and the end point portion, such as a splash body, a body body, a stopper body, a right brush body, and a left brush body. It is configured to have a memory element unit that stores the shape of the writing brush. In addition, when adding the writing brush shape to the stroke start point portion and the stroke end point portion, a similar writing brush shape that matches the line width of the intermediate portion is used so that an unnatural step is not generated in the drawing trajectory due to the addition. Further, the behavior of the pen before pen-up is performed by tracing back the pen behavior starting from that point after the detection of pen-up is made. The pen behavior before pen-up is to be calculated by reading the pen behavior data stored in the storage unit of the speed information calculation unit 4.

The drawing locus display unit 6 displays the drawing locus on the display based on the writing body locus formation information of the drawing locus determination unit 5. Next, the operation of the device of the present invention having the above configuration will be described based on the flowcharts of FIGS. Here, a combination of a pen and a tablet is used as an online input device, and the pen traveling direction is expressed in five ways: horizontal right, vertically downward, diagonally lower left, and diagonally lower right.

FIG. 2 is a flow chart showing the overall basic operation of the apparatus of this embodiment. When the operator traces on the tablet with a pen, a plurality of detection elements arranged on the input board of the drawing input unit 1 detect it and output the detection signal to the coordinate detection unit 2. The coordinate detection unit 2 detects a coordinate position (sequence of coordinate points) based on the detection signal (S1). Next, the speed information calculation unit 4 determines the time when the detection signal is input based on the time information of the time output unit 3, and based on the coordinate position information of two or more points to which the time is added, the speed information is calculated. (Pen advancing direction, advancing speed, acceleration, degree of change of advancing direction), pen start point, and pen end point are calculated (S2).

Next, according to the calculation result of the speed information calculation unit 4, the drawing trajectory determination unit 5 causes the stroke start point processing (S
3), stroke center portion processing (S4), and stroke end point processing (S5) are sequentially performed. Below, FIG.
The details of each of the subroutines of step S3, step S4, and step S5 will be described with reference to the flowcharts of FIG.

The contents of the stroke start point processing in step S3 are as follows. In step S21, it is determined whether or not the initial movement speed (pen movement amount) within a certain time after pen down is less than or equal to a threshold value, and if it exceeds the threshold value, without performing the brush forming process at the stroke start point. Return (S21; NO). On the other hand, if the initial velocity within a certain time after pen down is below the threshold value (S21; YE
S), determine whether the pen movement direction is the horizontal right direction, Y
In the case of ES, for example, a process of adding a "horizontal right body" having a shape like a circle in FIG. 6a is performed to the stroke start point (S23).

If the pen moving direction is other than the right horizontal direction in step S22, the operation proceeds to step S24 to determine whether the pen moving direction is the vertical downward direction. Then, when the moving direction is the vertical downward direction (S24; YES), the vertical downward corresponding start point image processing is performed (S25). On the other hand, if NO in step S24, the flow advances to step S26 to determine whether or not the pen movement direction is diagonally downward left. Then, when the pen movement direction is the diagonally lower left direction, the processing for adding the starting point shape image for the diagonally lower left direction is performed (S27).

Further, in the case of NO at step S26,
The operation proceeds to step S28, and when the pen movement direction is the diagonally lower right direction (S28; YES), a process of adding a shape image corresponding to the diagonally lower right direction is performed (S29). Then, the processing operation proceeds to the next stroke center processing (S4). The contents of the stroll center processing in step S4 are as follows.

In step S31, it is determined whether or not the pen is up, and if the pen is not up (S31; N).
O) advances to step S32 to determine whether the pen movement speed is equal to or higher than a threshold value (S32). If the pen movement speed is equal to or higher than the threshold value (S32; YES) and the movement speed is increased (S33; YES), the drawing line width is gradually narrowed (S34). On the other hand, when the pen movement speed is decreasing (S35; YES),
The drawing line width is gradually thickened (S36). FIG. 6b illustrates the drawing shape when the drawing line width is gradually narrowed and FIG. 6b is the drawing shape when the drawing line width is gradually thickened.

If NO in step S32 and if the operation in step S36 is completed, the process returns to step S31. When the pen-up is confirmed in step S31, the operation proceeds to stroke end point processing (S5). The details of the stroke end point processing in step S5 are as follows. When the pen is lifted up from the input board by the operator, the drawing locus forming unit 5 reads out the data stored in the storage unit of the speed information calculating unit 4 and judges the behavior information immediately before (before) the pen-up based on the data. . That is, it is determined whether the degree of change in the moving direction of the pen and the moving speed are equal to or more than a preset threshold value, and whether the moving speed increase amount (acceleration) immediately before pen-up is equal to or more than the threshold value. If it is determined that both are above the threshold value (S41; YE
S), a process of adding a "splash body" to the stroke end point is performed (S42).

On the other hand, if NO in step S41, the process proceeds to step S43 in which the pen moving direction before pen-up is horizontal right, the closing value of the pen moving speed is small, and the speed decrease degree (negative acceleration) is If both are large and YES, the drawing locus forming unit 5 adds a "horizontal direction binding body" to the stroke end point (S44). Similarly to the above, if NO in step S43, in step S45, it is determined whether the traveling direction before pen-up is vertical down, the closing value of the moving speed is small, or the degree of decrease of the moving speed is large.
In this case, the "vertical direction stopper" is added (S46).

On the other hand, in the case of NO at step S45, the movement direction before pen-up is the diagonally lower left direction (S47;
If the final value of the moving speed is large and the degree of decrease in the moving speed is small (S48), the "lower left direction paying body" is added (S49). On the other hand, when the final value of the moving speed is small and the degree of decrease of the moving speed is large (S50; YES), a "left direction stopper" is added (S51).

If NO in step S47, the process proceeds to step S52, and when the moving direction is diagonally lower right (S52; YES), the final value of the moving speed is large and the degree of decrease of the moving speed is small. At this time (S53), a "right direction paying body" is added (S54). On the other hand, N in step S53
When it is O, the process proceeds to step S55, and when the final value of the moving speed is small and the degree of decrease of the moving speed is large, a "bottom rightward direction stopper" is added (S56).

With the above, the drawing forming operation is completed. Here, some shape examples of the above various drawing bodies are shown in FIG.
It is illustrated in a to e. a round part is "horizontal right direction body", c round part is "diagonal left lower direction paying body", d round part is "diagonal right lower direction binding body", e round part is "vertical downward direction binding body" The body ". Note that the subject of the present invention is that the handwriting brush typeface, etc. is formed by actually reflecting the pen behavior made by the operator. Action is shown to clarify the subject of the present invention. Therefore, the above flow chart is not intended to eliminate the processing for adding a brush shape that is not described in the flow chart, but in reality, by adding more detailed processing, it becomes closer to a handwritten writing style. Drawing is formed.

In the above description, the numerical values of the pen movement direction, the speed, the speed change degree (acceleration change) and the direction change degree have been described using expressions such as “within threshold”, “large”, and “small”. The numerical values themselves do not directly affect the subject matter of the present invention, and may be set appropriately in consideration of the ease of drawing by the operator.

[0035]

As described above, according to the present invention, the contact position and time of the input pen on the tablet are detected, and the pen movement direction, the movement speed, the degree of increase or decrease of the movement speed, and the change of the movement direction are detected from the information. Calculate the degree. And
The line width can be adjusted according to the above data, and the brush body shape can be added to the stroke start point and the stroke end point.

Therefore, according to the drawing forming method and apparatus of the present invention, the pointing locus which the operator freely draws by his / her own brush stroke is approximated to a writing brush or a bold pen font by corresponding to the brush stroke. It is possible to form a drawing trajectory that reflects the individuality of the operator, which was impossible with the conventional drawing method,
That is, it is possible to create a handwritten brush typeface, a pen typeface, and the like.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a writing brush forming apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a basic operation of the writing brush writing system of the embodiment of the present invention.

FIG. 3 is a flowchart showing the contents of a subroutine operation of the flowchart of FIG.

FIG. 4 is a flowchart showing the contents of a subroutine operation of the flowchart of FIG.

5 is a flowchart showing the contents of a subroutine operation of the flowchart of FIG.

FIG. 6 illustrates an example of a writing brush typeface.

FIG. 7 is a configuration diagram of a conventional writing brush writing apparatus.

[Explanation of symbols]

 1 Drawing Input Section 2 Coordinate Detection Section 3 Time Output Section 4 Velocity Information Calculation Section 5 Drawing Trajectory Forming Section 6 Drawing Trajectory Display Section 31 Online Input Detection Section 32 Display Attribute Setting Section 33 Drawing Trajectory Display Section

Claims (6)

[Claims] 1. A step of detecting a contact position and a time of a coordinate indicator on an input board, a step of obtaining a velocity of the coordinate indicator on a handwriting based on the detected contact position and a time, and a handwriting point being accelerated. And the line width of the drawing location corresponding to the decelerated handwriting location is temporarily increased, and the drawing is performed. 2. The writing brush forming method according to claim 1, further comprising: a step of obtaining a moving speed at a starting point in a handwriting of the coordinate indicator and a pen moving direction thereafter, based on the detected contact position and time. And a step of drawing a starting-point writing brush shape, which is determined according to the moving direction and the moving speed at the starting point, at a drawing position corresponding to the starting point, the writing brush forming method. 3. The brush body forming method according to claim 2, further based on the detected contact position and time, the movement speed and acceleration at the end point in the handwriting of the coordinate indicator, and the movement direction in the handwriting before the end point. It is characterized by including a step of obtaining a change, and a step of drawing a brush shape at an end point, which is determined according to a change in moving speed and acceleration at the obtained end point, and a change in a moving direction before that, at a drawing position at a position corresponding to the end point. And a method for forming a brush body. 4. A detecting means for detecting the contact position and time of the coordinate indicator on the input board, a first calculating means for obtaining the speed of the coordinate indicator on the handwriting based on the detected contact position and time, and acceleration. A first drawing control means for temporarily reducing the line width of the drawing portion corresponding to the written handwriting portion and temporarily increasing the line width of the drawing portion corresponding to the decelerated handwriting portion. A brush forming device. 5. The brush-body forming device according to claim 4, further comprising: a second speed for determining a moving speed at a starting point in the handwriting of the coordinate indicator and a subsequent pen moving direction based on the detected contact position and time. A writing brush characterized by comprising: a computing unit; and a second drawing control unit that draws a brush shape at a starting point, which is determined according to the obtained moving direction and a moving speed at the starting point, at a drawing position at a position corresponding to the starting point. Forming equipment. 6. The brush body forming apparatus according to claim 5, further based on the detected contact position and time, the movement speed and acceleration at the end point in the handwriting of the coordinate indicator, and the movement direction in the handwriting before the end point. A third calculation means for obtaining the change, and a third drawing for drawing the brush shape at the end point, which is determined according to the change in the moving speed and acceleration at the obtained end point, and the change in the moving direction in front of it, at the drawing position corresponding to the end point. A brush body forming apparatus comprising: a control unit.