图形学第四次作业

#include  <windows.h> //此头文件一定要放在最前
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>
#include  <stdio.h>
#include  <stdlib.h>
#include  <math.h>
#include   <iostream>  
#include   <conio.h>
#include "time.h"
using   namespace   std;
//添加这3条语句
#pragma comment (lib, "opengl32.lib") 
#pragma comment (lib, "glu32.lib") 
#pragma comment (lib, "glaux.lib")
#pragma comment( linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" )
//这句是不让控制台窗体出现，如果想要出现，去掉即可。

float root2 = sqrt(2);
float base = 2*3.14159/10;
int DirectionX = 20;
int DirectionY = 30;
int WinWidth =800;
int WinHeight =600;
int xx = 200;
int yy = 200;
float angle = 0.7;
int R1 = 75;
int R2 = 36;
int cxx = 500;
int cyy = 500;
int cDirectionX = 20;
int cDirectionY = 30;
int cR = 100;
float pi = 3.14;
void drawangle(int x0,int y0,int x1,int y1,int x2,int y2)
{

	glBegin(GL_TRIANGLES);
	glVertex2i(x0,y0);
	glVertex2i(x1,y1);
	glVertex2i(x2,y2);
	glEnd();
}
void drawfive(int R1,int R2,float angle,int x,int y,float r1,float g,float b,float r2)
{
     int i;
	 int x0,y0,x1,y1;
	 float a1 = cos(angle-0.01);
	 float a2 = sin(angle-0.01);
	 x0 = x + R1*a1;
	 y0 = y + R1*a2;
	 for(i=1;i<=10;i++)
	 { 
		   float b1 = cos(angle+base*i);
		   float b2 = sin(angle+base*i);
		   if(i%2==1)
		   {
               glColor3f(r1,g,b);
			   x1 = x+R2*b1;
			   y1 = y+R2*b2;
               
		   }
		   else
		   {
			   glColor3f(r2,g,b);
		       x1 = x+R1*b1;
			   y1 = y+R1*b2;
		   }
		   drawangle(x,y,x0,y0,x1,y1);
		   x0 = x1;
		   y0 = y1;
	} 

}
void PloyAppCircle(int x0,int y0,int R,int r,int g,int b,int err)
{//误差控制的多边形逼近圆弧
    //float angle = 0.1;
	float angle = 2*acos((R-err)*1.0/R);
	printf("%f \n",angle);
	int n = 2*pi/angle;
	angle =  2*pi/n;
	printf("%d\n",n);
	int i;
	glColor3f(r,g,b); 
	glBegin(GL_LINE_LOOP);
	int x,y;
	for(i=0;i<n;i++)
	{
	    x = x0 + R*cos(i*angle);
		y = y0 + R*sin(i*angle);
		glVertex2i(x,y);
	    printf("%d %d\n",x,y);
	}
	glEnd();
}
void CALLBACK draw()
{
    
	 int LineWidth = 5;
	 int SmallLineWidth = LineWidth/2;
     glColor3f(1,0,0); //红色
	 glLineWidth(LineWidth);//float类型，线宽取值0--10.0
     glBegin(GL_LINE_LOOP);//线段,绘制边框
     glVertex2f(0+SmallLineWidth,0+SmallLineWidth);
     glVertex2f(0+SmallLineWidth,WinHeight-SmallLineWidth);
     glVertex2f(WinWidth-SmallLineWidth,WinHeight-SmallLineWidth);
     glVertex2f(WinWidth-SmallLineWidth,0);
     glEnd();
	 angle += base;
	 xx+= DirectionX;
	 yy+= DirectionY;
	 if((xx+R1)>=WinWidth || (xx -R1)<=0)  DirectionX= -DirectionX;
	 if((yy+R1)>=WinHeight || (yy -R1)<=0) DirectionY = -DirectionY;
	 if(angle>=6.2)angle=0;
	 
     drawfive(R1,R2,angle,xx+DirectionX,yy+DirectionY,1,0,0,0.5);
     srand(time(NULL));
	 int num = rand()%100;
     float scale = num/100.0;
	 if(scale<0.5) scale+=0.5;
     drawfive(scale*R1,scale*R2,angle,300,300,0.5,0.5,0.5,1);
     //circle
	 cDirectionX = rand()%60 -30;
     cDirectionY = rand()%40 -20;
	 cxx+= cDirectionX;
	 cyy+= cDirectionY;
     if((cxx+cR)>=WinWidth)
     {
	     cDirectionX= -cDirectionX;
		 cxx = WinWidth-cR;
	 }
	 else if((cxx -cR)<=0) 
     {
	     cDirectionX= -cDirectionX;
		 cxx = cR;
	 }
	 if((cyy+cR)>=WinHeight)
     {
	    cDirectionY = -cDirectionY;
	    cyy = WinHeight-cR;
	 }
	 else if((cyy -cR)<=0)
	 {
	    cDirectionY = -cDirectionY;
	    cyy = cR;
	 }
	 //cxx+= cDirectionX;
	// cyy+= cDirectionY;
	 glLineWidth(1);
     PloyAppCircle(cxx,cyy,cR,1,0,0,1);
	 Sleep(300);
   	
}
void CALLBACK change()
{

    glClear(GL_COLOR_BUFFER_BIT);
	draw();   
    glFinish();
}
void init()
{
      glClearColor(0.0,0.0,0.0,1.0);//黑色背景
}

void main()
{
    auxInitDisplayMode(AUX_SINGLE|AUX_RGBA);
    auxInitPosition(20 ,20 ,WinWidth ,WinHeight);//定义窗口的初始位置，前两个参数（x0,y0）是窗口左上角的屏幕坐标，后两个参数(w,h)为窗口宽和高
    auxInitWindow("CGOpenGL");

    init();

	auxIdleFunc(change);//一定要在auxMainLoop前面

    auxMainLoop(draw);
}