计算机图形学OpenGL实验一.doc

1、 实验报告学院（系）名称：姓名学号专业班级实验项目实验一：绘制基本图形课程名称计算机图形学课程代码实验时间实验地点批改意见成绩教师签字：一、实验目的1. 理解图形元素显示的基本原理，掌握扫描转换直线段的常用算法原理，扫描转换圆弧的常用算法原理。2. 熟悉glut常用几个功能函数3. 熟悉glut的函数回调机制4. 掌握绘制不同大小和颜色的点的方法5. 掌握绘制不同线型和颜色的直线的方法(直线，折线，环线)6. 掌握绘制彩色多边形边框的方法(各种设备)7. 熟悉OpenGL的编程环境(OpenGL+GlUT/SDK/MFC+C+)二、实验内容1. 绘制框架流程。2. 分别实现港口起重机、工程车、

2、等设备的绘制。3. 颜色的设置要合适，且易于更换。#include #include int SCREEN_HEIGHT = 480;/屏幕高度/ 跟踪鼠标点击次数，达到3次后绘制Bezier曲线int NUMPOINTS = 0;/点class Point public:float x, y;void setxy(float x2, float y2) x = x2; y = y2; const Point & operator=(const Point &rPoint) x = rPoint.x; y = rPoint.y; return *this; ;Point abc3;void m

3、yInit() glClearColor(0.0,0.0,0.0,0.0);glColor3f(1.0,0.0,0.0);glPointSize(4.0);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0.0,640.0,0.0,480.0);void drawDot(int x, int y) glBegin(GL_POINTS); glVertex2i(x,y);glEnd();glFlush();void drawLine(Point p1, Point p2) glBegin(GL_LINES); glVertex2f(

4、p1.x, p1.y); glVertex2f(p2.x, p2.y);glEnd();glFlush();/ 计算下一个Bezier曲线上的点Point drawBezier(Point A, Point B, Point C, double t) Point P;P.x = pow(1 - t), 2) * A.x + 2 * t * (1 -t) * B.x + pow(t, 2) * C.x;P.y = pow(1 - t), 2) * A.y + 2 * t * (1 -t) * B.y + pow(t, 2) * C.y;return P;void myMouse(int butt

5、on, int state, int x, int y) /左键按下 if(button = GLUT_LEFT_BUTTON & state = GLUT_DOWN) /存储鼠标点击的点abcNUMPOINTS.setxy(float)x,(float)(SCREEN_HEIGHT - y);NUMPOINTS+;/ 绘制红点drawDot(x, SCREEN_HEIGHT - y);/ 绘制Bezier曲线if(NUMPOINTS = 3) glColor3f(1.0,1.0,1.0);/ 绘制控制多边形drawLine(abc0, abc1);drawLine(abc1, abc2);P

6、oint POld = abc0;/绘制Bezier曲线段，控制t的增量可以控制曲线精度for(double t = 0.0;t = 1.0; t += 0.1) Point P = drawBezier(abc0, abc1, abc2, t);drawLine(POld, P);POld = P;glColor3f(1.0,0.0,0.0);NUMPOINTS = 0; void myDisplay() glClear(GL_COLOR_BUFFER_BIT);glFlush(); int main(int argc, char *argv) glutInit(&argc, argv);glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);glutInitWindowSize(640,480);glutInitWindowPosition(100,150);glutCreateWindow(Bezier Curve);glutMouseFunc(myMouse);glutDisplayFunc(myDisplay);myInit();glutMainLoop();return 0;