作者dryman (dryman)
看板NTUMEB96
标题Re: [讨论] 陈达仁机动程式
时间Wed Dec 3 00:35:40 2008
中文OpenGL教学网站：
http://0rz.tw/9304Q
英文：（资源较丰富，有些地方有点冗，不够精简）
http://nehe.gamedev.net/
画一个三角形和正方形的OpenGL程式码
我想大部分人都是跳一页之後就直接end吧XD
稍微讲解一下：
这篇程式码只用到三个函数：IntGL, DrawGLScene, ResizeGLScene
这三个我有用颜色标起来（
淡蓝）
前面的都只是在load标头档
IntGL, ResizeGLScene也都是别人写好的，照抄就行
真正在画图的就是DrawGLScene那几行（才24行而已）
摘录一下：
GLvoid DrawGLScene(GLvoid)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //清除颜色、深度
glLoadIdentity(); // Reset The View
glTranslatef(-1.5f,0.0f,-6.0f); //把画图座标移到()里的位置
glBegin(GL_POLYGON); //画三角形
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glEnd(); //三角形结束
glTranslatef(3.0f,0.0f,0.0f); //把画图座标移到()里的位置
glBegin(GL_QUADS); //画矩形
glVertex3f(-1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glEnd(); //矩形结束
glFlush();
}
其实没那麽复杂啦
套件很多但也不是像MATLAB那样，大家可以试着用这写写看
以下附全部的原始码：
#include <stdio.h> // Header File For Standard Input / Output
#include <stdarg.h> // Header File For Variable Argument Routines
#include <string.h> // Header File For String Management
#include <stdlib.h>
#include <OpenGL/gl.h> // Header File For The OpenGL32 Library
#include <OpenGL/glu.h> // Header File For The GLu32 Library
#include <GLUT/glut.h> // Header File For The GLUT Library
#include <math.h>
// Constants -----------------------------------------------------------------
#define kWindowWidth 400
#define kWindowHeight 300
// Function Prototypes -------------------------------------------------------
GLvoid
InitGL(GLvoid);
GLvoid
DrawGLScene(GLvoid);
GLvoid
ReSizeGLScene(int Width, int Height);
// Main ----------------------------------------------------------------------
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize (kWindowWidth, kWindowHeight);
glutInitWindowPosition (100, 100);
glutCreateWindow (argv[0]);
InitGL();
glutDisplayFunc(
DrawGLScene);
glutReshapeFunc(
ReSizeGLScene);
glutMainLoop();
return 0;
}
// Init ----------------------------------------------------------------------
GLvoid
InitGL(GLvoid)
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
glDepthFunc(GL_LESS); // The Type Of Depth Test To Do
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
glMatrixMode(GL_PROJECTION);
glLoadIdentity(); // Reset The Projection Matrix
gluPerspective(45.0f,(GLfloat)kWindowWidth/(GLfloat)kWindowHeight,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
glMatrixMode(GL_MODELVIEW);
}
// DrawGLScene ---------------------------------------------------------------
GLvoid
DrawGLScene(GLvoid)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); // Reset The View
glTranslatef(-1.5f,0.0f,-6.0f);
glBegin(GL_POLYGON);
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glEnd();
glTranslatef(3.0f,0.0f,0.0f);
glBegin(GL_QUADS);
glVertex3f(-1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glEnd();
glFlush();
}
// ReSizeGLScene ------------------------------------------------------------
GLvoid
ReSizeGLScene(int Width, int Height)
{
glViewport (0, 0, (GLsizei) Width, (GLsizei) Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (GLfloat) Width / (GLfloat) Height, 0.1, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
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