使用c-free软件编写opengl，可实现鼠标在屏幕上按住拖动可显示彩色矩形，squareMotion，初学小白，实测可用。-C-free software is written using opengl, can be achieved by dragging the mouse on the screen, press and hold to display the colored rectangles, squareMotion, novice white, found availabl