52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
// A simple introductory program; its main window contains a static picture
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// of a triangle, whose three vertices are red, green and blue. The program
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// illustrates viewing with default viewing parameters only.
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#ifdef __APPLE_CC__
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#include <GLUT/glut.h>
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#else
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#include <GL/glut.h>
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#endif
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// Clears the current window and draws a triangle.
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void display() {
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// Set every pixel in the frame buffer to the current clear color.
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glClear(GL_COLOR_BUFFER_BIT);
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// Drawing is done by specifying a sequence of vertices. The way these
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// vertices are connected (or not connected) depends on the argument to
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// glBegin. GL_POLYGON constructs a filled polygon.
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glBegin(GL_POLYGON);
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glColor3f(1, 0, 0); glVertex3f(-0.6, -0.75, 0.5);
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glColor3f(0, 1, 0); glVertex3f(0.6, -0.75, 0);
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glColor3f(0, 0, 1); glVertex3f(0, 0.75, 0);
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glEnd();
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// Flush drawing command buffer to make drawing happen as soon as possible.
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glFlush();
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}
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// Initializes GLUT, the display mode, and main window; registers callbacks;
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// enters the main event loop.
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int main(int argc, char** argv) {
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// Use a single buffered window in RGB mode (as opposed to a double-buffered
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// window or color-index mode).
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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// Position window at (80,80)-(480,380) and give it a title.
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glutInitWindowPosition(80, 80);
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glutInitWindowSize(400, 300);
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glutCreateWindow("A Simple Triangle");
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// Tell GLUT that whenever the main window needs to be repainted that it
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// should call the function display().
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glutDisplayFunc(display);
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// Tell GLUT to start reading and processing events. This function
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// never returns; the program only exits when the user closes the main
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// window or kills the process.
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glutMainLoop();
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} |