标签:style blog http color com width
#include <GL/glut.h>
typedef GLfloat point2d[2]; // a point data type
void triangle( point2d a, point2d b, point2d c) // display a triangle
{
glBegin(GL_TRIANGLES);
glVertex2fv(a);
glVertex2fv(b);
glVertex2fv(c);
glEnd();
}
void display(void)
{
point2d v[3] = {{-1.0, -0.58}, {1.0, -0.58}, {0.0, 1.15}}; //initial triangle vertices
glClear(GL_COLOR_BUFFER_BIT); // Clear display window
glColor3f(0.0,0.0,1.0); // Set fill color to blue
glViewport(0, 0, 300, 400); // Set left viewport
triangle(v[0], v[1], v[2]);
glColor3f(1.0,0.0,0.0); // Set fill color to red
glViewport(300, 0, 300, 400); // Set right viewport
glRotatef(90.0, 0.0, 0.0, 1.0); // Rotate about z axis
triangle(v[0], v[1], v[2]); // Display blue triangle
glFlush();
}
void init()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-2.0, 2.0, -2.0, 2.0);
glMatrixMode(GL_MODELVIEW);
glClearColor(1.0, 1.0, 1.0,1.0);
}
void main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(600, 400);
glutCreateWindow("Triangle");
glutDisplayFunc(display);
init();
glutMainLoop();
}
标签:style blog http color com width
原文地址:http://www.cnblogs.com/opengl/p/3790445.html