圖形學(xué) 用OpenGL實現(xiàn)平移旋轉(zhuǎn)縮放

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一、試驗?zāi)康模?/p>

1.了解OpenGL下簡單圖形的平移、旋轉(zhuǎn)、縮放變換的編程的基本思想；

2.把握OpenGL下簡單圖形的平移、旋轉(zhuǎn)、縮放變換的編程的基本步驟；二、試驗原理：

在OpenGL中，可以使用下面三個函數(shù)便捷地實現(xiàn)簡單圖形平移、旋轉(zhuǎn)、縮放變換的功能：

glRotatef(theta,,vy,vz);glTranslatef(dx,dy,dz);glScalef(sx，sy，sz);三、試驗內(nèi)容：

//1.cpp:Definestheentrypointfortheconsoleapplication.//

#include\#include\#include\

voiddisplay(){

glClear(GL_COLOR_BUFFER_BIT);//Cleartheframebuffer

glColor3f(0.0,1.0,1.0);//Setcurrentcolortogreen

glBegin(GL_POLYGON);//DrawthetriangleglVertex2f(0.0,-0.2);

glVertex2f(0.2,0.0);

glVertex2f(0.0,0.0);glEnd();glFlush();}voiddsp(){

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BI

T);//Cleartheframebuffer

glColor3f(0.0,1.0,1.0);//Setcurrentcolortogreendisplay();

////平移

glPushMatrix();

glTranslatef(0.5,0.5,0.0);

display();

glPopMatrix();

////縮放

glPushMatrix();glScalef(0.5,0.5,0.0);

display();glPopMatrix();

////旋轉(zhuǎn)

glPushMatrix();glRotatef(60,0.0,0.0,1.0);display();glPopMatrix();}

voidinit(){

glClearColor(0.0,0.0,0.0,0.0);//Settheclearcolortoblack//SpecifytheboundariesoftheviewingwindowglMatrixMode(GL_PROJECTION);glLoadIdentity();

gluOrtho2D(-1.0,1.0,-1.0,1.0);//Theparaare:(left,right,

bottom,top)

glMatrixMode(GL_MODELVIEW);}

intmain(intargc,char*argv[]){

glutInit(

glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEP

TH);}原圖：

glutCreateWindow(\glutDisplayFunc(dsp);init();

glutMainLoop