简单的 OpenGL 镂空多边形示例 EP_OpenGL_003

• 下载源代码 - 103.5 KB
• 下载演示程序 - 9.11 KB

引言

这个程序来自“OpenGL 编程指南（第三版）”。它是一个在多边形中使用点阵（线条模式）的示例。我还添加了另一个我自己创建的点阵模式。这个模式是我的首字母缩写，即 EP（Ercan Polat）。

Using the Code

请确保安装 GLUT 库。如果您不知道如何安装，请访问 我的第一篇文章。安装 Glut.h 文件后，只需编译代码并执行即可。

// StipplingPolygons.cpp : Defines the entry point for the console application.
// Ercan Polat: 02/04/2008
// Note: This program is an example of "OpenGL Programming Guide (Third Edition)". I did
// add a stippling part with my initials (EP). 
// Project Description: This project creates a simple OpenGl window using GLUT library.
// The program is an example of stipple patterns used on rectangle polygons.

#include "stdafx.h"
#include <GL/glut.h>

// function that creates the stipple patterns and rectangular polygons.
void display(void)
{
    // Stipple pattern of my initials (EP)
GLubyte myInitial[] = {
    0xff, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01,
    0xff, 0x01, 0xff, 0x01, 0x00, 0x01, 0x01, 0x01,
    0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01,
    0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01,
    0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01,
    0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01,
    0x00, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01,
    0xff, 0x00, 0xFF, 0x01, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,};

    // A stipple pattern of a fly
GLubyte fly[] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60,
    0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20,
    0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
    0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22,
    0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
    0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
    0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
    0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC,
    0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
    0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0,
    0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0,
    0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,
    0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08,
    0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08,
    0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};

    // Another stipple pattern
GLubyte halftone[] = {
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
    0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55};

    // Clear the Color Buffer
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);        	// Set the color to white 
    // draw one solid, unstippled rectangle
    glRectf(25.0, 25.0, 125.0, 125.0);
    glEnable(GL_POLYGON_STIPPLE);          	// Enable POLYGON STIPPLE
    glPolygonStipple(fly);                   	// Pass the stipple array 
    glRectf (125.0, 25.0, 225.0, 125.0);   	// draw the first rectangle 
					// with the first stipple
    glPolygonStipple(halftone);              	// pass the second stipple array
    glRectf(225.0, 25.0, 325.0, 125.0);    	// draw the rectangle
    
    // My own code starts here
    glColor3f(1.0, 0.0,0.0);            	// Set change the color to red  
    glPolygonStipple(myInitial);        	// Pass the stipple my initial (EP) 
    glRectf(25.0, 125.0, 325.0, 225.0); 	// Draw a bigger rectangle
    glDisable(GL_POLYGON_STIPPLE);      	// Disable the POLYGON STIPPLE
    glFlush();
}
void init (void)
{
    glClearColor(0.0, 0.0, 0.0, 0.0);    	// Clear the background set it to black
    glShadeModel(GL_FLAT);                 	// set the shading model to FLAT
}
// Function that resets the window, each time when the window size is changed
void reshape(int w, int h)
{
    glViewport (0, 0, (GLsizei) w, (GLsizei) h);    
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);
}
// Main entry point of the program
int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); 
    glutInitWindowSize(350, 250);    // set up the window size
    glutCreateWindow(argv[0]);       // create the window
    init();                          // initialize the window
    glutDisplayFunc(display);        // call the display to draw the rectangles
    glutReshapeFunc(reshape);        // call the reshape function 
				// (each time when the window size is changed)
    glutMainLoop();
    return 0;
}  

历史

• 2008年2月5日：初始发布