我想在 opengl 中选择 2d 对象,但不知道如何。我希望它像 3d 中的 gluPickMatrix 一样。这是我尝试过的:
void initDraw2D(){
GLuint buff[BUFSIZE];
GLint hits, view[4];
glSelectBuffer(BUFSIZE, buff);
glGetIntegerv(GL_VIEWPORT, view);
glRenderMode(GL_SELECT);
glInitNames();
glPushName(0);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPickMatrix(mouseX, view[3] - mouseY, 1.0, 1.0, view);
glMatrixMode(GL_MODELVIEW);
Draw();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
hits = glRenderMode(GL_RENDER);
if (onSelect){
processHits(hits, buff);
onSelect = false;
}
Draw();
glutPostRedisplay();
}
但是当我点击它时它不会选择。