Draw-a-triangle--square.rar_square openGL_triangle

#include <windows.h> // Must have for Windows platform builds #include <gl/gl.h> // Microsoft OpenGL headers (version 1.1 by themselves) #include <gl/glu.h> // OpenGL Utilities #include <gl/glut.h>" // Glut (Free-Glut on Windows) /////////////////////////////////////////////////////////// // Called to draw scene void RenderScene(void) { // Clear the window with current clearing color glClear(GL_COLOR_BUFFER_BIT); // 清除屏幕及深度缓存 glLoadIdentity(); // 重置当前的模型观察矩阵 glTranslatef(-1.5f,0.0f,-6.0f); // 左移 1.5 单位，并移入屏幕 6.0 glBegin(GL_TRIANGLES); // 绘制三角形 glVertex3f( 0.0f, 1.0f, 0.0f); // 上顶点 glVertex3f(-1.0f,-1.0f, 0.0f); // 左下 glVertex3f( 1.0f,-1.0f, 0.0f); // 右下 glEnd(); glTranslatef(3.0f,0.0f,0.0f); // 右移3单位 glBegin(GL_QUADS); // 绘制正方形 glVertex3f(-1.0f, 1.0f, 0.0f); // 左上 glVertex3f( 1.0f, 1.0f, 0.0f); // 右上 glVertex3f( 1.0f,-1.0f, 0.0f); // 左下 glVertex3f(-1.0f,-1.0f, 0.0f); // 右下 glEnd(); // 正方形绘制结束 // Flush drawing commands glFlush(); } /////////////////////////////////////////////////////////// // Called by GLUT library when the window has chanaged size void ChangeSize(int width, int height) { if (height==0) // Prevent A Divide By Zero By { height=1; // Making Height Equal One } glViewport(0,0,width,height); // Reset The Current Viewport glMatrixMode(GL_PROJECTION); // Select The Projection Matrix glLoadIdentity(); // Reset The Projection Matrix // Calculate The Aspect Ratio Of The Window gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix glLoadIdentity(); // Reset The Modelview Matrix } /////////////////////////////////////////////////////////// // Setup the rendering state void SetupRC(void) { glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background } /////////////////////////////////////////////////////////// // Main program entry point int main(int argc, char* argv[]) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA); glutCreateWindow("Simple"); glutDisplayFunc(RenderScene); glutReshapeFunc(ChangeSize); SetupRC(); glutMainLoop(); return 0; }