cpPolyShapeInit
时间: 2024-05-05 08:16:39 浏览: 7
cpPolyShapeInit is a function in the Chipmunk physics engine that initializes a polygon shape. The function takes in a pointer to a cpPolyShape structure, a pointer to a cpBody structure, an integer value for the number of vertices in the polygon, and an array of cpVect structures representing the vertices of the polygon.
The function calculates the centroid of the polygon and sets the body, friction, elasticity, and collision type properties of the cpPolyShape structure.
Here is an example of how to use cpPolyShapeInit to create a square polygon shape:
```
cpVect verts[] = {
cpv(-10, -10),
cpv(-10, 10),
cpv(10, 10),
cpv(10, -10)
};
cpPolyShape polyShape;
cpPolyShapeInit(&polyShape, body, 4, verts);
```
This creates a square polygon shape with a body pointer of "body" and four vertices at (-10,-10), (-10,10), (10,10), and (10,-10).