三维图形学实验报告.doc
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实验一
（1）三角形：
#include glut.h // glut.h includes gl.h and glu.h
void init(void) {
glClearColor(0.0, 0.0, 0.0, 0.0);
}
void reshape(int w, int h) {
glViewport(0, 0, (GLsizei)w, (GLsizei)h);
glMatrixMode(GL_PROJECTION);// 指定哪一个矩阵是当前矩阵
glLoadIdentity();//重置当前指定的矩阵为单位矩阵。
gluOrtho2D(-1.0, 1.0, -1.0, 1.0); // The para are: (left, right, bottom, top) 定义二维正交投影矩阵
glMatrixMode(GL_MODELVIEW); //指定哪一个矩阵是当前矩阵
}
void display(void) {
glClear(GL_COLOR_BUFFER_BIT); // Clear the frame buffer
glColor3f(0.0, 1.0, 0.0); // Set current color to green
glBegin(GL_POLYGON); // Draw the triangle
glVertex2f(-0.7, -0.7);
glVertex2f(0.7, -0.7);
glVertex2f(0, 0.7);
glEnd();
glFlush(); // Force to display the new drawings immediately
}
int main(int argc, char **argv) {
glutInit(argc, argv); // Initialize GLUT function callings
glutInitWindowSize(400, 400);
glutInitWindowPosition(200, 100); // in numbers of pixels
glutCreateWindow(Green Triangle);
glutDisplayFunc(display); // is created or re-drew
init(); // Invoke this function for initialization
glutMainLoop(); // Enter the event processing loop
return 0; // Indicate normal termination
// (Required by ANSI C)
}// 操作，定义事件回调函数
（2）点：
void display(){
glClear(GL_COLOR_BUFFER_BIT); // Clear the frame buffer
glColor3f(0.0, 1.0, 0.0); // Set current color to green
glPointSize(10.);
glBegin(GL_POINTS);
glVertex2i(0.5,0.5);
glEnd();
glFlush(); // Force to display the new drawings immediately
}
（3）线段：
void display(){
glClear(GL_COLOR_BUFFER_BIT); // Clear the frame buffer
glColor3f(0.0, 1.0, 0.0); // Set current color to green
glLineWidth(3.0);
glBegin(GL_LINES);
glVertex3f(0., 0., 0.);
glVertex3f(0., 1., 0.);
glEnd();
glFlush(); // Force to display the new drawings immediately
}
（4）四边形：
void display(){
glClear(GL_COLOR_BUFFER_BIT); // Clear the frame buffer
glColor3f(1.0, 0.0, 0.0); // Set current color to green
glRectf(0.6, 0.3, 0.2, 0.8);
int vertex1[] = { 0.6, 0.3};
int vertex2[] = { 0.2, 0.8};
gl
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