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test4-3.cpp
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test4-3.cpp
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/*实验四 多边形的图案填充的实现*/
/*改造p147程序5-12，设计菜单，菜单项是线框和填充，菜单项值分别为1、2，实现填充的、线框的正交观察四面体。*/
#include"pch.h"
#include<cstdio>
#include<gl/glut.h>
int iMode = 1;
int addw = 200, addh = 150;
GLuint lineList,lineList2,lineList3;
GLubyte fly[] =
{
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0x00,0x00,0xff,0xff,0x00,0x00,0xff,0xff,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
0xff,0xff,0x00,0x00,0xff,0xff,0x00,0x00,
};
inline void putpixel(int x, int y) {
/*glBegin(GL_POINTS);
glVertex2d(x + addw, y + addh); glVertex2d(-x + addw, y + addh);
glVertex2d(x + addw, -y + addh); glVertex2d(-x + addw, -y + addh);
glEnd();*/
//glRectf(x + addw, y + addh, -x + addw, -y + addh);
glVertex3f(x+addw, y+addh, 0.0);
}
void MidBresehamEllipse(int a, int b) {
int x, y;
double d1, d2;
lineList3 = glGenLists(3);
glNewList(lineList3,GL_COMPILE);
glBegin(GL_TRIANGLES);
x = 0; y = b;
d1 = b * b + a * a*(-b + 0.25);
putpixel(x, y);
while (b*b*(x + 1) < a*a*(y - 0.5)) {
if (d1 <= 0) { d1 += b * b*(2 * x + 3); x++; }
else { d1 += b * b*(2 * x + 3) + a * a*(-2 * y + 2); x++; y--; }
putpixel(x, y);
}
d2 = b * b*(x + 0.5)*(x + 0.5) + a * a*(y - 1)*(y - 1) - a * a*b*b;
while (y > 0) {
if (d2 <= 0) { d2 += b * b*(2 * x + 2) + a * a*(-2 * y + 3); x++; y--; }
else { d2 += a * a*(-2 * y + 3); y--; }
putpixel(x, y);
}
glEnd();
glEndList();
}
void Initial(){
float x[] = {1.0, 3.0, 2.0, 3.0};
float y[] = {1.0, 2.0, 4.0,3.0 };
float z[] = {0, 0, 0, 1};
float cx[] = { 1, 0.0, 1.0, 0.0 };
float cy[] = { 1, 1.0, 0.0,1.0 };
float cz[] = { 0, 0, 0, 1 };
glClearColor(1.0f,1.0f,1.0f,1.0f); //RGBA设置窗口背景颜色为白色
glLineWidth(12.0);
//MidBresehamEllipse(abs(50 - addw), abs(50 - addh));
lineList = glGenLists(1);
glNewList(lineList,GL_COMPILE);
for (int i = 0; i < 4; i++) {
glBegin(GL_TRIANGLES);
for (int j = 0; j < 3; j++)
glVertex3f(x[(i+j)%4],y[(i+j)%4],z[(i+j)%4]);
glEnd();
glColor3f(cx[i], cy[i], cz[i]);
}
glEndList();
lineList2 = glGenLists(2);
glNewList(lineList2,GL_COMPILE);
glBegin(GL_LINE_LOOP);
glColor4f(0.0, 0.5, 1.0, 1.0);
glVertex3f(x[0], y[0], z[0]);
for (int j = 1; j < 3; j++) {
glVertex3f(x[j],y[j],z[j]);
glColor3f(cx[j],cy[j], cz[j]);
}
glEnd();
glBegin(GL_LINES);
glColor4f(0.0, 0.5, 1.0, 1.0);
for (int j = 0; j < 3; j++) {
glVertex3f(x[3], y[3], z[3]);
glVertex3f(x[j], y[j], z[j]);
glColor3f(cx[j],cy[j],cz[j]);
}
glEnd();
glEndList();
}
void ChangeSize(GLsizei w,GLsizei h) {
if (h == 0) h = 1;
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h) gluOrtho2D(0, 5, 0, 6.0*((GLfloat)h / w));
else gluOrtho2D(0, 5.0*((GLfloat)h / w), 0, 6);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void Displayt() {
glClear(GL_COLOR_BUFFER_BIT); //用当前背景色填充窗口
glClear(GL_COLOR_BUFFER_BIT); //用当前背景色填充窗口
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glEnable(GL_POLYGON_STIPPLE);
glPolygonStipple(fly);
glLoadIdentity();
glCallList(lineList);
//glCallList(lineList3);
glutPostRedisplay();
glutSwapBuffers();
glFlush();//清空OpenGL缓冲区，执行OpenGL程序
}
void Displayw() {
glClear(GL_COLOR_BUFFER_BIT); //用当前背景色填充窗口
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (iMode==1)glCallList(lineList);
else glCallList(lineList2);
glFlush();//清空OpenGL缓冲区，执行OpenGL程序
}
void ProcessMenu(int value) {
iMode = value;
glutPostRedisplay();
}
int main(int argc, char* argv[])
{
glutInit(&argc,argv); //对GLUT库进行初始化
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); //设定窗口的显示模式，包括缓存和颜色模型等
glutInitWindowSize(400,300); //设置窗口大小400x300
glutInitWindowPosition(100,120); //设置窗口位置（Windows下右上角为(0,0)）
glutCreateWindow("四面体"); //创建一个名为矩形的窗口
glutDisplayFunc(Displayt); //设置当前窗口的回调函数（即窗口显示的内容）
glutReshapeFunc(ChangeSize);
Initial(); //完成窗口初始化
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(400, 300);
glutInitWindowPosition(500, 120);
glutCreateWindow("四面体2");
int nGlutLineMenu = glutCreateMenu(ProcessMenu);
glutAddMenuEntry("Line", 2);
glutAddMenuEntry("face", 1);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutDisplayFunc(Displayw);
glutReshapeFunc(ChangeSize);
Initial();
glutMainLoop(); //启动主GLUT事件处理循环
return 0;
}