hi...Im stuck in this bunch of codes...i cant get the pixel to fill up the circle??...any help
#include<iostream>
#include<glut.h>
struct Color{
float red, green, blue;
};
Color getPixel(int x, int y){ // gets the color of the pixel at (x,y)
Color c;
float color[4];
glReadPixels(x,y,1,1,GL_RGBA, GL_FLOAT, color);
c.red = color[0];
c.green = color[1];
c.blue = color[2];
return c;
}
void setPixel(int x, int y, Color c){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushAttrib(GL_ALL_ATTRIB_BITS);
glColor3f(c.red, c.green, c.blue);
glBegin(GL_POINTS);
glVertex2i(x,y);
glEnd();
glPopAttrib();
glFlush();
}
void init()
{
glClearColor(1.0,1.0,1.0,0.0);
gluOrtho2D(0.0,300.0,0.0,300.0);
}
void drawPixel(int x,int y)
{
glBegin(GL_POINTS);
glVertex2i(x,y);
glEnd();
glFlush();
}
void Boundary_fill(int x,int y,Color thisColor){
Color boundary_color;
boundary_color.red=0.0;
boundary_color.green=1.0;
boundary_color.blue=0.0;
Color nextpixel=getPixel(x,y);
if((nextpixel.red!=boundary_color.red)&&(nextpixel.blue!=boundary_color.blue)&&(nextpixel.green!=boundary_color.green) && (nextpixel.red!=thisColor.red)&& (nextpixel.blue!=thisColor.blue)&& (nextpixel.green!=thisColor.green)){
setPixel(x,y,thisColor);
Boundary_fill((x+1),y,thisColor);
Boundary_fill((x-1),y,thisColor);
Boundary_fill(x,(y+1),thisColor);
Boundary_fill(x,(y-1),thisColor);
}
}
void draw(int x1,int y1, int x, int y){
drawPixel(x1+x,y1+y);//quadrant1
drawPixel(x1+x,y1-y);//quadrant2
drawPixel(x1-x,y1+y);//quadrant3
drawPixel(x1-x,y1-y);//quadrant4
drawPixel(x1+y,y1+x);//quadrant5
drawPixel(x1+y,y1-x);//quadrant6
drawPixel(x1-y,y1+x);//quadrant7
drawPixel(x1-y,y1-x);//quadrant8
}
void circle(int px,int py,int r){
int a,b;
float p;
a=0;
b=r;
p=(5/4)-r;
while(a<=b){
draw(px,py,a,b);
if(p<0){
p=p+(2*a)+1;
}
else{
b=b-1;
p=p+(2*a)+1-(2*b);
}
a=a+1;
}
}
void Circle(void)
{
Color thisColor;
thisColor.red=1.0;
thisColor.blue=0.0;
thisColor.green=0.0;
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0,1.0,0.0);
glPointSize(2.0);
int x0 = 100;
int y0 = 150;
circle(x0,y0,50);
glColor3f(thisColor.red,thisColor.blue,thisColor.green);
Boundary_fill(x0,y0,thisColor);
}
void main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(400,400);
glutInitWindowPosition(1,1);
glutCreateWindow("Boundary fill in a circle:Taaseen And Abhinav");
init();
glutDisplayFunc(Circle);
glutMainLoop();
}
