自己怎样用手机建网站,最吃香的男生十大手艺,哪里有做ppt的网站,如何做外贸网店1.视景体 正交投影
人眼看世界#xff0c;有一个可见范围。范围内可见#xff0c;范围外不可见。视景体就是这么一个概念。 #xff08;上图仅学习记录用#xff09;
在OGL中#xff0c;有两种投影方式#xff0c;对应两种视景体。第一种#xff0c;正交投影#xf…1.视景体 正交投影
人眼看世界有一个可见范围。范围内可见范围外不可见。视景体就是这么一个概念。 上图仅学习记录用
在OGL中有两种投影方式对应两种视景体。第一种正交投影第二种透视投影更符合人眼。 正交投影 透视投影可见从视觉效果上透视投影更符合人眼 正交投影代码 #include GL/gl.h
#include GL/glu.h
#include GL/glut.h// Rotation amounts
static GLfloat xRot 0.0f;
static GLfloat yRot 0.0f;void ChangeSize(GLsizei w, GLsizei h) {GLfloat nRange 100.0f;if (h 0) h 1;glViewport(0, 0, w, h); //视口是一个矩形区域它定义了OpenGL窗口中可以显示图形的区域glMatrixMode(GL_PROJECTION); //下面对堆栈的操作是对 投影堆栈glLoadIdentity();//保持视景体的 纵横比 为w/hif (w h)glOrtho (-nRange, nRange, -nRange*h/w, nRange*h/w, -nRange*2.0f, nRange*2.0f);elseglOrtho (-nRange*w/h, nRange*w/h, -nRange, nRange, -nRange*2.0f, nRange*2.0f);glMatrixMode(GL_MODELVIEW); //再把堆栈由 投影栈 转换为 变换栈glLoadIdentity();
}//先不看这个灯光什么的初始化
void SetupRC() {// Light values and coordinatesGLfloat whiteLight[] { 0.45f, 0.45f, 0.45f, 1.0f };GLfloat sourceLight[] { 0.25f, 0.25f, 0.25f, 1.0f };GLfloat lightPos[] { -50.f, 25.0f, 250.0f, 0.0f };glEnable(GL_DEPTH_TEST); // Hidden surface removal glFrontFace(GL_CCW); // Counter clock-wise polygons face outglEnable(GL_CULL_FACE); // Do not calculate inside of jet// Enable lightingglEnable(GL_LIGHTING);// Setup and enable light 0glLightModelfv(GL_LIGHT_MODEL_AMBIENT,whiteLight);glLightfv(GL_LIGHT0,GL_AMBIENT,sourceLight);glLightfv(GL_LIGHT0,GL_DIFFUSE,sourceLight);glLightfv(GL_LIGHT0,GL_POSITION,lightPos);glEnable(GL_LIGHT0);// Enable color trackingglEnable(GL_COLOR_MATERIAL);// Set Material properties to follow glColor valuesglColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);// Black blue backgroundglClearColor(0.0f, 0.0f, 0.0f, 1.0f );
}void SpecialKeys(int key, int x, int y) {if (key GLUT_KEY_UP) xRot - 5.0f;if (key GLUT_KEY_DOWN) xRot 5.0f;if (key GLUT_KEY_LEFT) yRot - 5.0f;if (key GLUT_KEY_RIGHT) yRot 5.0f;xRot (GLfloat)((const int)xRot % 360);yRot (GLfloat)((const int)yRot % 360);// Refresh the WindowglutPostRedisplay();
}void RenderScene(void) {float fZ,bZ;// Clear the window with current clearing colorglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);fZ 100.0f;bZ -100.0f;// Save the matrix state and do the rotationsglPushMatrix();glRotatef(xRot, 1.0f, 0.0f, 0.0f);glRotatef(yRot, 0.0f, 1.0f, 0.0f);// Set material color, RedglColor3f(1.0f, 0.0f, 0.0f);// Front FaceglBegin(GL_QUADS);// Pointing straight out ZglNormal3f(0.0f, 0.0f, 1.0f);// Left PanelglVertex3f(-50.0f, 50.0f, fZ);glVertex3f(-50.0f, -50.0f, fZ);glVertex3f(-35.0f, -50.0f, fZ);glVertex3f(-35.0f,50.0f,fZ);// Right PanelglVertex3f(50.0f, 50.0f, fZ);glVertex3f(35.0f, 50.0f, fZ);glVertex3f(35.0f, -50.0f, fZ);glVertex3f(50.0f,-50.0f,fZ);// Top PanelglVertex3f(-35.0f, 50.0f, fZ);glVertex3f(-35.0f, 35.0f, fZ);glVertex3f(35.0f, 35.0f, fZ);glVertex3f(35.0f, 50.0f,fZ);// Bottom PanelglVertex3f(-35.0f, -35.0f, fZ);glVertex3f(-35.0f, -50.0f, fZ);glVertex3f(35.0f, -50.0f, fZ);glVertex3f(35.0f, -35.0f,fZ);// Top length section// Normal points up Y axisglNormal3f(0.0f, 1.0f, 0.0f);glVertex3f(-50.0f, 50.0f, fZ);glVertex3f(50.0f, 50.0f, fZ);glVertex3f(50.0f, 50.0f, bZ);glVertex3f(-50.0f,50.0f,bZ);// Bottom sectionglNormal3f(0.0f, -1.0f, 0.0f);glVertex3f(-50.0f, -50.0f, fZ);glVertex3f(-50.0f, -50.0f, bZ);glVertex3f(50.0f, -50.0f, bZ);glVertex3f(50.0f, -50.0f, fZ);// Left sectionglNormal3f(1.0f, 0.0f, 0.0f);glVertex3f(50.0f, 50.0f, fZ);glVertex3f(50.0f, -50.0f, fZ);glVertex3f(50.0f, -50.0f, bZ);glVertex3f(50.0f, 50.0f, bZ);// Right SectionglNormal3f(-1.0f, 0.0f, 0.0f);glVertex3f(-50.0f, 50.0f, fZ);glVertex3f(-50.0f, 50.0f, bZ);glVertex3f(-50.0f, -50.0f, bZ);glVertex3f(-50.0f, -50.0f, fZ);glEnd();glFrontFace(GL_CW); // clock-wise polygons face outglBegin(GL_QUADS);// Back section// Pointing straight out ZglNormal3f(0.0f, 0.0f, -1.0f);// Left PanelglVertex3f(-50.0f, 50.0f, bZ);glVertex3f(-50.0f, -50.0f, bZ);glVertex3f(-35.0f, -50.0f, bZ);glVertex3f(-35.0f,50.0f,bZ);// Right PanelglVertex3f(50.0f, 50.0f, bZ);glVertex3f(35.0f, 50.0f, bZ);glVertex3f(35.0f, -50.0f, bZ);glVertex3f(50.0f,-50.0f,bZ);// Top PanelglVertex3f(-35.0f, 50.0f, bZ);glVertex3f(-35.0f, 35.0f, bZ);glVertex3f(35.0f, 35.0f, bZ);glVertex3f(35.0f, 50.0f,bZ);// Bottom PanelglVertex3f(-35.0f, -35.0f, bZ);glVertex3f(-35.0f, -50.0f, bZ);glVertex3f(35.0f, -50.0f, bZ);glVertex3f(35.0f, -35.0f,bZ);// Insides /glColor3f(0.75f, 0.75f, 0.75f);// Normal points up Y axisglNormal3f(0.0f, 1.0f, 0.0f);glVertex3f(-35.0f, 35.0f, fZ);glVertex3f(35.0f, 35.0f, fZ);glVertex3f(35.0f, 35.0f, bZ);glVertex3f(-35.0f,35.0f,bZ);// Bottom sectionglNormal3f(0.0f, 1.0f, 0.0f);glVertex3f(-35.0f, -35.0f, fZ);glVertex3f(-35.0f, -35.0f, bZ);glVertex3f(35.0f, -35.0f, bZ);glVertex3f(35.0f, -35.0f, fZ);// Left sectionglNormal3f(1.0f, 0.0f, 0.0f);glVertex3f(-35.0f, 35.0f, fZ);glVertex3f(-35.0f, 35.0f, bZ);glVertex3f(-35.0f, -35.0f, bZ);glVertex3f(-35.0f, -35.0f, fZ);// Right SectionglNormal3f(-1.0f, 0.0f, 0.0f);glVertex3f(35.0f, 35.0f, fZ);glVertex3f(35.0f, -35.0f, fZ);glVertex3f(35.0f, -35.0f, bZ);glVertex3f(35.0f, 35.0f, bZ);glEnd();glFrontFace(GL_CCW); // Counter clock-wise polygons face out// Restore the matrix stateglPopMatrix();// Buffer swapglutSwapBuffers();
}int main(int argc, char *argv[]) {glutInit(argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); //需要动画使用的是双缓冲glutInitWindowSize(800, 600);glutCreateWindow(Orthographic Projection);//回调函数glutReshapeFunc(ChangeSize); //改变窗口大小glutSpecialFunc(SpecialKeys); //敲击特殊键glutDisplayFunc(RenderScene); //显示//初始化函数SetupRC();glutMainLoop();return 0;
}透视投影替换代码 2.几个代码示例主要目的弄明白 变换栈
1三个球绕红球转
效果 #include GL/gl.h
#include GL/glu.h
#include GL/glut.h// Rotation amounts
static float xRot 0.0f;void RenderScene(void) {// Angle of revolution around the nucleusstatic float fElect1 0.0f;// Clear the window with current clearing colorglClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Reset the modelview matrixglMatrixMode(GL_MODELVIEW);glLoadIdentity();glTranslatef(0.0f, 0.0f, -100.0f); //AglColor3ub(255, 0, 0);glutSolidSphere(10.0f, 15, 15); // 红色实心球AglColor3ub(255,255,0);glPushMatrix();glRotatef(fElect1, 0.0f, 1.0f, 0.0f); //BglTranslatef(90.0f, 0.0f, 0.0f); //CglutSolidSphere(6.0f, 15, 15); //黄色实心球1ABCglPopMatrix();//xRot由特殊键控制glPushMatrix();glRotatef(45.0f, 0.0f, 0.0f, 1.0f); //DglRotatef(xRot, 0.0f, 1.0f, 0.0f); //EglTranslatef(-70.0f, 0.0f, 0.0f); //FglutSolidSphere(6.0f, 15, 15); //黄色实心球2ADEFglPopMatrix();glPushMatrix();glRotatef(300.0f,0.0f, 0.0f, 1.0f); //GglRotatef(fElect1, 0.0f, 1.0f, 0.0f); //HglTranslatef(0.0f, 0.0f, 60.0f); //IglutSolidSphere(6.0f, 15, 15); //黄色实心球3AGHI)glPopMatrix();// Increment the angle of revolutionfElect1 1.0f;if (fElect1 360.0f)fElect1 0.0f;// Show the imageglutSwapBuffers();
}void SetupRC() //初始化函数
{glEnable(GL_DEPTH_TEST); // Hidden surface removalglFrontFace(GL_CCW); // Counter clock-wise polygons face outglEnable(GL_CULL_FACE); // Do not calculate inside of jetglClearColor(0.0f, 0.0f, 0.0f, 1.0f );
}void SpecialKeys(int key, int x, int y) {if (key GLUT_KEY_UP) xRot - 5.0f;if (key GLUT_KEY_DOWN) xRot 5.0f;//if (key GLUT_KEY_LEFT) yRot - 5.0f;//if (key GLUT_KEY_RIGHT) yRot 5.0f;if (key 356.0f) xRot 0.0f;if (key -1.0f) xRot 355.0f;//if (key 356.0f) yRot 0.0f;//if (key -1.0f) yRot 355.0f;glutPostRedisplay(); // Refresh the Window
}void TimerFunc(int value) {glutPostRedisplay(); // Refresh the Window/*millis指定的时间间隔以毫秒为单位。callback指向回调函数的指针该回调函数在指定时间间隔过后被调用。data传递给回调函数的整型数值参数*/glutTimerFunc(10, TimerFunc, 1); //seconds, func, para(注册了一个定时器
}void ChangeSize(int w, int h) {float nRange 100.0f;if (h 0) h 1;glViewport(0, 0, w, h);glMatrixMode(GL_PROJECTION);glLoadIdentity();//正交投影(left, right, bottom, top, near, far)if (w h)glOrtho (-nRange, nRange, nRange*h/w, -nRange*h/w, -nRange*2.0f, nRange*2.0f);elseglOrtho (-nRange*w/h, nRange*w/h, nRange, -nRange, -nRange*2.0f, nRange*2.0f);
}int main(int argc, char* argv[]) {glutInit(argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(800, 600);glutCreateWindow(OpenGL Atom);glutReshapeFunc(ChangeSize); //改变窗口大小时的回调函数glutSpecialFunc(SpecialKeys); //敲击特殊键的回调函数glutDisplayFunc(RenderScene); //显示的回调函数glutTimerFunc(500, TimerFunc, 1); ///new!!(保持连续变化SetupRC();glutMainLoop();return 0;
} 2键盘控制的自转和公转
效果 ///
#include GL/gl.h
#include GL/glu.h
#include GL/glut.h
#include stdlib.h
#include iostream///
static int year 0, day 0;///
void init(void) {glClearColor(0.0, 0.0, 0.0, 0.0);glShadeModel(GL_FLAT);
}///
void display(void) {glClear(GL_COLOR_BUFFER_BIT);glColor3f(1.0, 1.0, 1.0);glPushMatrix();glRotatef((GLfloat)year, 0.0, 1.0, 0.0); //A实现自传效果glutWireSphere(1.0, 20, 16); //画线框太阳A///思考加上这两句的效果会怎样//glPopMatrix();//glPushMatrix();glTranslatef(2.0, 0.0, 0.0); //BglRotatef((GLfloat) day, 0.0, 1.0, 0.0); //CglutWireSphere(0.2, 10, 8); //画线框地球ABCglPopMatrix();glutSwapBuffers();
}///
void reshape(int w, int h) {glViewport(0, 0,(GLsizei) w,(GLsizei) h);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(60.0,(float) w/(float) h, 1.0, 20.0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
}///
void keyboard(unsigned char key, int x, int y) {switch(key) {case d: day (day 10) % 360; break;case D: day (day - 10) % 360; break;case y: year (year 5) % 360; break;case Y: year (year - 5) % 360; break;case 27: exit(0);default: break;}glutPostRedisplay();
}///
int main(int argc, char** argv) {std::coutD/d: 行星转动\nY/y: 太阳转动\n;glutInit(argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);glutInitWindowSize(500, 500);glutInitWindowPosition(500, 100);glutCreateWindow(earthmoon);init(); //初始化函数glutDisplayFunc(display); //显示的回调函数glutReshapeFunc(reshape); //改变窗口大小的回调函数glutKeyboardFunc(keyboard); //点击键盘的回调函数glutMainLoop();return 0;
}
如果点击‘D’或者‘d’矩阵C变化地球实现自转的效果如果点击‘Y’或者‘y’矩阵A变化太阳自转地球跟着太阳转如果同时按下‘D’或者‘d’以及‘Y’或者‘y’地球自转的同时绕着太阳公转同时太阳也在自转。
3星系
效果 #include math.h
#include gl/gl.h
#include gl/glu.h
#include gl/glut.h
#define N 6///
// Lighting values
float whiteLight[] { 0.2f, 0.2f, 0.2f, 1.0f };
float sourceLight[] { 1.0f, 1.0f, 1.0f, 1.0f };
float lightPos[] { 0.0f, 0.0f, 0.0f, 1.0f };float para[N][3] { {2.0f, 30.0f, 99.f},{3.0f, 50.0f, 44.f},{6.0f, 70.0f, 20.f},{5.0f, 90.0f, 80.f},{9.0f, 110.0f, 10.f},{2.0f, 120.0f, 15.f}};
float fEarthRot 0;///
void RenderScene(void) {glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glMatrixMode(GL_MODELVIEW);glPushMatrix();glLoadIdentity();glTranslatef(0.0f, 0.0f, -300.0f); //AglRotatef(15, 1.0f, 0.0f, 0.0f); //BglDisable(GL_LIGHTING);glColor3ub(255, 255, 0);glutSolidSphere(10.0f, 18, 17); // 太阳(AB)glEnable(GL_LIGHTING);glLightfv(GL_LIGHT0, GL_POSITION, lightPos); // Move the light after we draw the sun!for (int i0; iN; i) //画几大行星{glPushMatrix(); //AB再复制一份放到栈顶glRotatef(fEarthRot*para[i][2], 0.0f, 1.0f, 0.0f); //CglColor3ub(0,0,255);glTranslatef(para[i][1],0.0f,0.0f); //DglutSolidSphere(para[i][0], 30, 17); //画行星ABCDglPushMatrix(); //ABCD再复制一份放到栈顶glLoadIdentity(); //转化为单位阵IglTranslatef(0.0f, 0.0f, -300.0f); //EglRotatef(15, 1.0f, 0.0f, 0.0f); //FglDisable(GL_LIGHTING);glColor3f(1,0,0);glBegin(GL_LINE_LOOP); //画轨迹for (float j0; j2*3.14149265; j0.1f) {glVertex3f(para[i][1]*sin(j), 0.0f, para[i][1]*cos(j)); //轨迹EF}glEnd();glPopMatrix(); //将当前栈顶矩阵 EF 弹出glPopMatrix(); //将当前栈顶矩阵 ABCD 弹出弹出后栈顶元素变为ABglEnable(GL_LIGHTING);}glPopMatrix(); //将当前栈顶矩阵 AB 弹出fEarthRot 0.1f;if (fEarthRot 360.0f) fEarthRot 0.0f; //转起来glutSwapBuffers();
}//初始化函数关于灯光的一些操作
///
void SetupRC() {glEnable(GL_DEPTH_TEST);glFrontFace(GL_CCW);glEnable(GL_CULL_FACE);glEnable(GL_LIGHTING);glLightModelfv(GL_LIGHT_MODEL_AMBIENT,whiteLight);glLightfv(GL_LIGHT0,GL_DIFFUSE,sourceLight);glLightfv(GL_LIGHT0,GL_POSITION,lightPos);glEnable(GL_LIGHT0);glEnable(GL_COLOR_MATERIAL);glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);glClearColor(0.3f, 0.3f, 0.3f, 1.0f );
}///
void TimerFunc(int value) {glutPostRedisplay(); //重新绘制glutTimerFunc(100, TimerFunc, 1); //设置定时器
}///
void ChangeSize(int w, int h) {float fAspect;if (h 0) h 1;glViewport(0, 0, w, h);fAspect (float)w/(float)h;glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(40.0f, fAspect, 1.0, 600.0); //透视投影glMatrixMode(GL_MODELVIEW);glLoadIdentity();
}///
int main(int argc, char* argv[]) {glutInit(argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(800, 600);glutCreateWindow(Earth/Moon/Sun System);glutReshapeFunc(ChangeSize); //改变窗口大小的回调函数glutDisplayFunc(RenderScene); //显示的回调函数glutTimerFunc(250, TimerFunc, 1); ///new!!SetupRC(); //初始化glutMainLoop();return 0;
}
程序分析 4月亮绕着地球转、地球绕着太阳转
效果 #include math.h
#include gl/gl.h
#include gl/glu.h
#include gl/glut.h///
// Lighting values
float whiteLight[] { 0.2f, 0.2f, 0.2f, 1.0f };
float sourceLight[] { 1.0f, 1.0f, 1.0f, 1.0f };
float lightPos[] { 0.0f, 0.0f, 0.0f, 1.0f };///
void RenderScene(void) {static float fMoonRot 0.0f;static float fEarthRot 0.0f;glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// Save the matrix state and do the rotationsglMatrixMode(GL_MODELVIEW);glPushMatrix();glLoadIdentity();glTranslatef(0.0f, 0.0f, -300.0f); //AglDisable(GL_LIGHTING);glColor3ub(255, 255, 0);glutSolidSphere(18.0f, 18, 17); /// 太阳(A)glEnable(GL_LIGHTING);// Move the light after we draw the sun!glLightfv(GL_LIGHT0, GL_POSITION, lightPos);glRotatef(fEarthRot, 0.0f, 1.0f, 0.0f); //BglColor3ub(0,0,255);glTranslatef(105.0f,0.0f,0.0f); //CglutSolidSphere(6.0f, 30, 17); ///地球ABCglColor3ub(200,200,200);glRotatef(fMoonRot,0.0f, 0.0f, 1.0f); //DglTranslatef(15.0f, 0.0f, 0.0f); //EglutSolidSphere(3.0f, 30, 17); ///月亮ABCDE// Restore the matrix stateglPopMatrix(); // Modelview matrixfMoonRot 10.0f;if (fMoonRot 360.0f)fMoonRot 0.0f;fEarthRot 2.0f;if (fEarthRot 360.0f)fEarthRot 0.0f;// Show the imageglutSwapBuffers();
}///
// This function does any needed initialization on the rendering context.
void SetupRC() {glEnable(GL_DEPTH_TEST); // Hidden surface removalglFrontFace(GL_CCW); // Counter clock-wise polygons face outglEnable(GL_CULL_FACE); // Do not calculate inside of jetglEnable(GL_LIGHTING);glLightModelfv(GL_LIGHT_MODEL_AMBIENT,whiteLight);glLightfv(GL_LIGHT0,GL_DIFFUSE,sourceLight);glLightfv(GL_LIGHT0,GL_POSITION,lightPos);glEnable(GL_LIGHT0);glEnable(GL_COLOR_MATERIAL);glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);glClearColor(0.3f, 0.3f, 0.3f, 1.0f );
}///
void TimerFunc(int value) {glutPostRedisplay();glutTimerFunc(100, TimerFunc, 1);
}///
void ChangeSize(int w, int h) {float fAspect;if (h 0) h 1;glViewport(0, 0, w, h);fAspect (float)w/(float)h;glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(45.0f, fAspect, 1.0, 425.0); //透视投影// Modelview matrix resetglMatrixMode(GL_MODELVIEW);glLoadIdentity();}///
int main(int argc, char* argv[]) {glutInit(argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(800, 600);glutCreateWindow(Earth/Moon/Sun System);glutReshapeFunc(ChangeSize); //改变窗口大小的回调函数glutDisplayFunc(RenderScene); //显示的回调函数glutTimerFunc(250, TimerFunc, 1); ///new!!SetupRC(); //初始化函数glutMainLoop();return 0;
}推广
5机器人的手臂
效果 ///
#include GL/gl.h
#include GL/glu.h
#include GL/glut.h
#include stdlib.h
#include stdio.h///
static int shoulder 0, elbow 0;///
void init(void) {glClearColor (0.0, 0.0, 0.0, 0.0);glShadeModel (GL_FLAT);
}///
void display(void) {glClear (GL_COLOR_BUFFER_BIT);glPushMatrix(); //将当前栈顶矩阵A复制一份放在栈顶glTranslatef (-1.0f, 0.0, 0.0); //BglRotatef ((GLfloat) shoulder, 0.0, 0.0, 1.0f); //CglTranslatef (1.0, 0.0, 0.0); //DglPushMatrix(); //将当前栈顶矩阵ABCD复制一份放在栈顶glScalef (2.0f, 0.4f, 1.0f); //EglutWireCube (1.0); ///机器人 上手臂(ABCDE)glPopMatrix(); //将当前栈顶矩阵ABCDE弹出glTranslatef (1.0f, 0.0, 0.0); //FglRotatef ((GLfloat) elbow, 0.0, 0.0, 1.0f); //GglTranslatef (1.0f, 0.0, 0.0); //HglScalef (2.0f, 0.4f, 1.0f); //IglutWireCube (1.0f); ///机器人 下手臂ABCDFGHIglPopMatrix(); //将当前栈顶矩阵ABCDFGHI弹出glPopMatrix(); //将当前栈顶矩阵ABCD弹出glPopMatrix(); //将当前栈顶矩阵A弹出glutSwapBuffers();
}///
void reshape (int w, int h) {glViewport (0, 0, (GLsizei) w, (GLsizei) h);glMatrixMode (GL_PROJECTION);glLoadIdentity ();gluPerspective(65.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0); //透视投影glMatrixMode(GL_MODELVIEW);glLoadIdentity();glTranslatef (0.0, 0.0, -5.0); // A
}///
void keyboard (unsigned char key, int x, int y) {switch (key) {case s: shoulder (shoulder 5) % 360; break;case S: shoulder (shoulder - 5) % 360; break;case e: elbow (elbow 5) % 360; break;case E: elbow (elbow - 5) % 360; break;case 27: exit(0);default: break;}glutPostRedisplay();
}///
int main(int argc, char** argv) {printf(S, Or E\n);glutInit(argc, argv);glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);glutInitWindowSize (500, 500);glutInitWindowPosition (100, 100);glutCreateWindow (robot);init (); //初始化函数glutDisplayFunc(display); //显示的回调函数glutReshapeFunc(reshape); //改变窗口大小时的回调函数glutKeyboardFunc(keyboard); //敲击键盘的回调函数glutMainLoop();return 0;
}简单分析
显示函数中旋转之前都有一个平移。也就是物体进行缩放后长度变为2先向右平移一个单位之后再进行旋转这样物体的最左侧位于原点位置相当于物体以其最右侧为旋转固定中心进行旋转。完成这一效果之后再进行平移也不影响这一效果物体以其最右侧为旋转固定中心进行旋转。
