图形学代码及截图.doc

实验2：代码：#include#includeGLdoubleangle = 10.0;void display()glClear(GL_COLOR_BUFFER_BIT);glMatrixMode(GL_MODELVIEW);glBegin(GL_POLYGON);glVertex2d(-0.5,-0.5);glVertex2d(-0.5,0.5);glVertex2d(0.5,0.5);glVertex2d(0.5,-0.5);glEnd();glFlush();void mouseFunc(int button,int state,int x,int y)/旋转if(state=GLUT_DOWN & button=GLUT_LEFT_BUTTON)glMatrixMode(GL_MODELVIEW);glLoadIdentity();if(angle360)angle+=10;elseangle-=360;glRotatef(angle,1,1,2);glutPostRedisplay();void keyboard(unsigned char key,int x,int y)if(key=27)exit(-1);void init()glClearColor(0.0,0.0,0.0,0.0);glColor3f(1.0,0.0,0.0);void reshape(int w,int h)glViewport(0,0,w,h);int main(int argc,char *argv)glutInit(&argc, argv);glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100);glutCreateWindow(OpenGL中的建模与变换);init ();glutDisplayFunc(display); glutReshapeFunc(reshape);glutKeyboardFunc(keyboard);glutMouseFunc(mouseFunc);glutMainLoop();return 0;截图：点击旋转：体会：主要是我们在进行变换的时候，要注意glMatrixMode的设置，在进行投影变换的时候要设置为GL_PROJECTION,而当图形变换的时候要设置为GL_MODELVIEW模式。实验3：代码：#include#includevoid display()glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glColor3f(1.0,1.0,1.0);glEnable(GL_LIGHT0);glDisable(GL_LIGHT1);glMatrixMode(GL_MODELVIEW);glLoadIdentity();glTranslatef(-0.5,0,0);glutSolidSphere(0.3,20,22);glLoadIdentity();glDisable(GL_LIGHT0);glEnable(GL_LIGHT1);glTranslatef(0.5,0,0);glutSolidSphere(0.3,20,22);glutSwapBuffers();void keyboard(unsigned char key,int x,int y)if(key=27)exit(-1);void init()glClearColor(0.0,0.0,0.0,0.0);GLfloat position04=-10,10,-10,1;GLfloat ambient04=1,0,0,1;glLightfv(GL_LIGHT0,GL_POSITION,position0);glLightfv(GL_LIGHT0,GL_AMBIENT,ambient0);GLfloat position14=10,10,-10,1;GLfloat ambient14=0,1,0,1;glLightfv(GL_LIGHT1,GL_POSITION,position1);glLightfv(GL_LIGHT1,GL_AMBIENT,ambient1);glEnable(GL_LIGHTING);glEnable(GL_DEPTH_TEST);void reshape(int w,int h)glViewport(0,0,w,h);int main(int argc,char *argv)glutInit(&argc, argv);glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100);glutCreateWindow(OpenGL中的光照);init ();glutDisplayFunc(display); glutReshapeFunc(reshape);glutKeyboardFunc(keyboard);glutMainLoop();return 0;截图：体会：不知道为什么，右边的球体好像没有左边的光线效果，这点查询了很久还是不明白。实验4：#include #include#includeusing namespace std;GLint select = 0;void drawObjects(GLenum mode)if(mode = GL_SELECT)/绘制红色的小球glPushName(1);if(select=1)/判断选中的是什么颜色的球，然后采用什么颜色红球还是白色的球glColor3f(1,1,1);elseglColor3f(1,0,0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();glTranslatef(-0.5,0,0);glutSolidSphere(0.3,20,22);glPopName();glLoadIdentity();if(mode = GL_SELECT) /绘制绿色的小球glPushName(2);if(select=2)/判断选中的是什么颜色的球，然后采用什么颜色绘制glColor3f(1,1,1);elseglColor3f(0,1,0);glTranslatef(0.5,0,0);glutSolidSphere(0.3,20,22);glPopName();select=0;/显示完后将select设置为0void display()glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);drawObjects(GL_RENDER);glutSwapBuffers();void keyboard(unsigned char key,int x,int y)if(key=27)exit(-1);void init()glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glClearColor(0.0,0.0,0.0,0.0);void reshape(int w,int h)glViewport(0,0,w,h);void draw(GLint hits,GLuint buffer)/这个是操作堆栈，判断点击的是什么颜色的球unsigned int i, j; GLuint name, *ptr; if(hits=0)cout未点击任何球体！endl;elseptr = buffer;for(i=0;ihits;i+)name=*ptr;ptr+=3;if(*ptr=1)cout红色球被点击！endl;select=1;elsecout绿色球被点击endl;select=2;ptr+;drawObjects(GL_RENDER);/点击完后设置球的颜色，重绘#define SIZE 512void pickRects(int button,int state,int x,int y)GLuint selectBufSIZE;GLint hits,viewport4;if(button=GLUT_LEFT_BUTTON & state=GLUT_DOWN)glGetIntegerv(GL_VIEWPORT,viewport);glSelectBuffer(SIZE,selectBuf);glRenderMode(GL_SELECT);glInitNames();glMatrixMode(GL_PROJECTION);glPushMatrix();glLoadIdentity();gluPickMatrix(GLdouble) x, (GLdouble) (viewport3 - y),3.0, 3.0, viewport);drawObjects(GL_SELECT);/设置为选择模式glMatrixMode(GL_PROJECTION);glPopMatrix();glFlush(); /绘制结束hits=glRenderMode(GL_RENDER);draw(hits,selectBuf);int main(int argc,char *argv)glutInit(&argc, argv);glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100);glutCreateWindow(OpenGL中的拾取);init ();glutDisplayFunc(display); glutMouseFunc(pickRects);glutReshapeFunc(reshape);glutKeyboardFunc(keyboard);glutMainLoop();return 0;截图：初次显示点击红球，然后点击绿球，或是点击黑色部分命令行显示我们的操作体会：这个拾取过程我们控制select用来显示两个的球的显示颜色，特别注意显示完之后要将其select=0；同时在对堆栈进行操作的时候要特别注意，不然就溢出啦。实验5：代码：#include#include#define ImageWidth 64#define ImageHeight 64static GLubyte ImageImageHeightImageWidth3;static GLuint texName;void makeImage()int i,j,c;for(i=0;iImageWidth;i+)for(j=0;jImageHeight;j+)if(i%168)if(j%168)c=225;elsec=0;elseif(j%168)c=0;elsec=225; Imageij0=(GLubyte)c; Imageij1=(GLubyte)c; Imageij2=(GLubyte)c;void display()glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glColor3f(1.0,1.0,1.0); glMatrixMode(GL_MODELVIEW);glLoadIdentity();glTranslated(-0.5,0,0); glBegin(GL_QUADS);/绘制四边形 /定义两个带纹理的平面： /指定纹理坐标和几何坐标，每个纹理 /坐标与其后的几何坐标对应glTexCoord2d(0,0);glVertex2d(-0.4,-0.4);glTexCoord2d(1,0);glVertex2d(-0.4,0.4);glTexCoord2d(1,1);glVertex2d(0.4,0.4);glTexCoord2d(0,1);glVertex2d(0.4,-0.4); glEnd(); glLoadIdentity();glTranslated(0.5,0,0); glBegin(GL_QUADS);glTexCoord2d(0,0);glVertex2d(0.4,-0.4);glTexCoord2d(1,0);glVertex2d(0.4,0.4);glTexCoord2d(1,1);glVertex2d(-0.4,0.4);glTexCoord2d(0,1);glVertex2d(-0.4,-0.4); glEnd(); glFlush();/相应ESC按键void keyboard(unsigned char key,int x,int y)if(key=27)exit(-1);/纹理映射void init()glClearColor(0.0,0.0,0.0,0.0);glEnable(GL_DEPTH_TEST); makeImage();glPixelStorei(GL_UNPACK_ALIGNMENT,1); glTexImage2D(GL_TEXTURE_2D, 0,3,ImageWidth, ImageHeight, 0 ,GL_RGB,GL_UNSIGNED_BYTE, Image); /控制映射方式 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,GL_CLAMP); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexPar