[Original] sets the image center to rotate around (OpenGL | es)

Suppose you want to draw a 32*32 image at the point (x, y) and rotate it in the center of the image, use the following CodeThen you can rotate glfloat vertices [] = {-imagewidth/2,-imageheight/2, imagewidth/2,-imageheight/2,-imagewidth/2, imageheight/2, imagewidth/2, imageheight/2}; // rotate around the center at the bottom /glfloat vertices [] /// {//-imagewidth/2, 0.0, // imagewidth/2, 0.0, //-imagewidth/2, imageheight, // imagewidth/2, imageheight //}; glloadidentity (); glcolor4f (1.0f, 1.0f, 1.0f, 1.0f); glpushmatrix (); gltranslatef (X, Y, 0.0f); glrotatef (angle, 0.0f, 0.0f, 1.0f); glscalef (XScale, yscale, 1.0f); glvertexpointer (2, gl_float, 0, vertices); gltexcoordpointer (2, gl_float, 0, coordinates); gldrawarrays (gl_triangle_strip, 0, 4); glpopmatrix, for example, you can use the positive and negative symbols of Angle in glrotatef (angle, 0.0f, 0.0f, 1.0f) to change from clockwise to counterclockwise.