To determine the coordinates of a control point, you can use the relative coordinate function known as polar. The polar function is defined as (polar p0 angle distance), where p0 represents the coordinate of the reference point, angle is the angle between the line connecting the target point and p0 with the horizontal axis, and distance is the length from the reference point to the target point. For instance, if the angle between the line connecting p1 and p0 and the horizontal axis is 90 degrees, and the distance is 0.5 units, then the expression (polar p0 90 0.5) would return the coordinates of p1. For points like p28, p27, and o43, you can directly call the Get-CPP-LL function to retrieve their coordinates. When it comes to drawing standard parts in a CAD file, these elements are typically inserted as blocks. Therefore, before starting the drawing process, you need to create a block first. The following code creates a block named mBlock: (setq blockName (Get-Blockname "Luoding-KaiCaoPantou")) (setq mBlock (apa-addblock mBlock blockName)). Once the block is created, all drawing operations should be performed within the block space. The next two commands draw a line and an arc inside the newly created block mBlock: (apa-addLine mBlock p24 p10); draws a line, and (apa-addArc mBlock o4 r (angle o4 p28) (angle o4 p27)); draws an arc. The Get-Blockname function is a custom function used to generate a valid block name, while the apa-addLine and apa-addArc functions are part of the AP-API (Artful Programming API), a specialized development toolkit that combines programming techniques with artistic design. This API allows for more efficient and flexible creation of drawings in CAD environments. By using these functions and following the block-based approach, you can streamline your drawing workflow, improve consistency, and maintain better organization in complex CAD projects. Whether you're working on simple shapes or intricate designs, leveraging such tools can significantly enhance both productivity and accuracy. Commercial Plywood,Birch Plywood,Construction Plywood,Waterproof Pp Plastic Plywood RILICO , https://www.rilico.com