JPH0315224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic non-uniform scale drawing method in which complex figures are deformed and drawn in an easy-to-understand manner using a drawing device using a CAD system.

Prior Art Conventionally, when drawings are generally performed using a drafting device using a CAD system, the drawings are drawn at a uniform scale in both the X and Y directions, dimension lines and dimension assistance lines are written for each line segment, and dimension numbers are also written. etc. are printed. However, according to this method, if the figure has a partially complex and minute shape as shown in FIG. In the enclosed area, the dimension lines overlap, making it difficult to distinguish which part of the figure is being measured. Also, if the same figure as shown in Figure 3 is drawn based on JIS, the drawing will be done as shown in Figure 4, so the dimension extension lines will be long and it will be difficult to see which part of the figure is measuring. In addition to being difficult to distinguish, the dimension extension lines require an extremely large space relative to the figures, resulting in problems such as the overall drawing becoming unbalanced.

For this purpose, enlarging the whole drawing or a part of it and drafting it requires large drawing paper and increases the number of drawings, which makes drawing management complicated and requires NC equipment in the next step. When inputting data, etc., it is necessary to refer to a plurality of drawings while inputting information, which has the drawback of being prone to errors.

Purpose In view of the above points, the present invention provides a method for making dimension lines, dimension extension lines, and dimension numbers easy to see even in the case of figures having complex and minute shapes, without increasing the overall size of the drawing. It is an object of the present invention to provide an automatic non-uniform scale drawing method that enlarges or reduces a figure non-uniformly (that is, the magnification of each side composing the figure is different) according to the shape of the figure. .

Overview The purpose of this is to use a drafting device that uses a CAD system to read graphic shape information on the same scale as the actual object input into the CAD system computer, and display it in the X and Y directions based on the read graphic shape information. Calculate the number of required dimension numbers, and multiply the calculated number by the height of the dimension numbers to make the dimension numbers easier to read + the value of the dimension number interval to make the dimension numbers easier to see, respectively, and calculate the values in the X and Y directions, respectively. determine the size of the paper to be used by comparing these values with the lengths of the short and long sides of the paper, and calculate the dimension number spacing obtained from the figure shape information and the dimension numbers that make the above dimension numbers easier to read. From the height + the value of the interval between the dimension numbers to make it easier to see the dimension numbers above, the number of the dimension numbers above, and the length of the short side or long side of the paper,
Calculate an appropriate magnification of the dimension number interval obtained from the figure shape information so that the figure to be drawn will fit within the paper, and calculate the dimension number interval, the magnification, and the dimension number height + that makes it easier to see the dimension number. The length of each line segment of the figure to be drawn is calculated from the value of the dimension number interval that makes the dimension numbers easier to see, and the figure is drawn by controlling the drafting device based on the length of each line segment. This problem is solved by a non-uniform scale automatic drafting method characterized by the following.

Embodiment The present invention will be described in detail below based on an embodiment shown in the drawings.

FIG. 1 is a flowchart showing a method of calculating non-uniform scale within a computer of a CAD system.

First, the shape information of the figure on the same scale as the actual object that is input into the computer of the CAD system, that is, each line segment that defines the figure shape (each side that makes up the figure)
Read the xy coordinates of both end points and the center coordinates and radius of the circle and arc. Based on the read information, the number of dimension numbers that need to be displayed in the x and y directions (x
For line segments that are not horizontal or perpendicular to the axis or y-axis, the angle is displayed, so the number also includes the dimension number for angle display)
Calculate Nx and Ny. A constant a is added to the calculated Nx and Ny.
Multiply by to calculate a・Nx and a・Ny. constant a
is the value of the height of the dimension numbers plus the value of the gap between the dimension numbers in order to make the dimension numbers easier to see.

Next, among the output paper sizes input in advance, the calculated a, Nx, a, and Ny are compared with the short side Lx ₁ and long side Ly ₁ of A4 paper, and Lx ₁
If ≧a・Nx and Ly ₁ ≧a・Ny, it is determined that drawing is possible on A4 paper, and if not, a similar comparative judgment is made for A3 paper. If it is determined that it is not possible to draw on A3 paper, a similar comparison will be made on A2 paper. If it is determined that it is impossible to draw on A2 paper, the calculation is terminated as an exception figure.

Here, if it is determined that it is possible to draw on A4 paper among A4 to A2 paper, as shown in Fig. 2, L ₁ =Lx ₁ -a・Nx ...(1) L ₂ =Ly ₁ - a・Ny ……(2) is calculated, and if L ₁ <L ₂ , Lx ₁ = _Nx 〓 ⁱ⁼² (a+b×(Δx _i ) ^c ) ……(3), and L ₁ ≧L In the case of ₂ , the value of the magnification b is calculated from Ly ₁ = _Nx 〓 ⁱ⁼² (a+b×(Δy _i ) ^c ) (4). At this time Δx _i , Δy _i
indicates the difference in coordinates from the i-th dimension number to the i-1th dimension number, and c is a numerical value that is arbitrarily set so that short line segments are relatively long and long line segments are enlarged to be relatively short. Therefore, it is better to use the value of 1/2 (c=1/2) because the scale curve is more appropriate and the calculation is simpler.

This magnification b allows A4 paper to be used to the maximum extent as a drawing area.

Here _, from the constant a, the magnification b, and the difference in the coordinates of adjacent dimension numbers Δx _{i and} Δy i when the scale is equal to that of the actual object, ΔX _i = a + b × (Δx _i ) ^c ……(5) ΔY _i = a + b × ( Δy _i ) ^c ... (6) By performing the calculation of c=1/2, the distance values Δx i and Δy _i in the case of uniform scale from the real object are changed to the values ΔX i and Δy _i due to the non-uniform scale of the present _invention . Convert to ΔY _i and this ΔX _i ,
Define a new figure shape based on ΔY _i . That is, the length of each line segment of the figure to be drawn is defined.
Similarly, the center coordinates of circles and arcs are ΔX _i , ΔY _i
The value of is set, the arc is defined as a circle, and the diameter is calculated as ΔX _i from equation (5), with the actual diameter value as Δx _i .

When the same figure as the figure in Figure 3 is drawn at a non-uniform scale using the method described above, the drawing is done as shown in Figure 5, and the complex and minute shape of the figure is drawn with each dimension line and dimension. It is now very easy to understand with numbers, and each circular hole is marked with the symbol "1", and the symbol "No. 1》2-M3" is displayed below, making it easier to understand the circle indicated by the symbol "1". It is shown that there are two holes with a diameter of 3 mm, preferably a reduced drawing of uniform scale so that the overall shape of the figure to be drawn can be easily seen (see Figure 5C). is also written.

FIGS. 6 and 7 show drawings of figures of other shapes drawn at non-uniform scales using the method of the present invention, and in the case of FIG. 6, there is an arc-shaped notch,
This is drawn by a circle indicated by the symbol "15", and the symbol "15" is drawn by the display "No. 15》1-D6.1".
Although it is shown that there is one circular arc with a diameter of 6.1 mm, it can be easily recognized that it is an arc-shaped notch from the uniformly scaled whole scale diagram attached. Also, in the case of Figure 7, there is an arcuate notch, but in this case, the corresponding circle does not overlap the outline of the drawing due to the drawing, but the circle is The arcuate notch can be easily recognized.

Effects of the Invention As described above, according to the present invention, from the shape of the figure to be drawn, the number of dimension lines for each line segment of the figure in the X direction and Y direction, and the size of the dimension number to be printed, Determine the dimensions of the paper to be used, calculate the length of each line segment as an enlarged or reduced length so that the dimension lines and dimension numbers of each line segment are appropriately spaced from each other, and calculate the calculated non-uniform scale length. By controlling the drawing device based on the length of each line segment, the figures to be drawn are drawn at non-uniform scales, so that line segments with large dimensions are reduced and lines with small dimensions are enlarged to form the figure. Since the whole is displayed on a non-uniform scale and the length of each line segment is selected to be at least sufficiently larger than the height of the dimension number, the dimension lines and dimension numbers are spaced appropriately from each other, and the complex and Minute shapes are enlarged, and extension lines are not required, so the entire shape is easy to see, and each dimension number is located close to the part to be indicated, so it can be read accurately and quickly. Furthermore, since the minimum necessary paper size can be selected, drawing management becomes easy, which is extremely effective.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing an embodiment of the present invention, Fig. 2 is a flowchart showing a magnification calculation method, and Figs. 3 and 4 show an example of a figure drawn at a uniform scale by a conventional method. Figure 5 shows the same figure as the figure in Figure 3 drawn at a non-uniform scale according to the present invention, and Figures 6 and 7 show examples of other figures drawn according to the method of the present invention. FIG.

Claims (1)

[Claims] 1. Read the figure shape information of the same scale as the real thing input into the computer of the CAD system, calculate the number of dimension numbers that need to be displayed in the X direction and the Y direction based on the read figure shape information, respectively,
Multiply the calculated number by the height of the dimension numbers to make the dimension numbers easy to read + the value of the dimension number interval to make the dimension numbers easy to see, respectively, to find the values in the X direction and Y direction, and combine these values with the short side and length of the paper. The size of the paper to be used is determined by comparing the lengths of each side, and the dimension number spacing obtained from the above figure shape information and the dimension number height that makes the above dimension numbers easy to read + the dimension number spacing that makes the above dimension numbers easy to see Based on the value of , the number of dimension numbers above, and the length of the short side or long side of the paper, calculate the appropriate magnification of the interval between dimension numbers obtained from the figure shape information so that the figure to be drawn will fit within the paper. Each line segment of a figure is calculated from the dimension number interval obtained from the figure shape information, the magnification, the dimension number height that makes the above dimension numbers easier to see, and the value of the dimension number interval that makes the above dimension numbers easier to see. 1. A non-uniform scale automatic drawing method, characterized in that a figure is drawn by calculating the length of each line segment and controlling a drawing device based on the length of each line segment.