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Flood_Fill.c
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Flood_Fill.c
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#include <windows.h>
#include<GL/glut.h>
#include<math.h>
#include<stdio.h>
int xmin, ymin, xmax, ymax; //Polygon boundaries
float old[3] = {0.0, 0.0, 0.0}; //Color of the polygon - black
float new[3] = {1.0, 0.0, 0.0}; //Color to be filled - red
void Color_Pixel(int x, int y)
{
glBegin(GL_POINTS);
glColor3fv(new);
glVertex2i(x, y);
glEnd();
glFlush();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
//Drawing polygon
glColor3fv(old);
glBegin(GL_POLYGON);
glVertex2i(xmin, ymin);
glVertex2i(xmin, ymax);
glVertex2i(xmax, ymax);
glVertex2i(xmax, ymin);
glEnd();
glFlush();
}
void Flood_Fill(int x,int y)
{
float curr[3];
glReadPixels(x, y, 1.0, 1.0, GL_RGB, GL_FLOAT, curr);
// if curr == old
if(curr[0] == old[0] && (curr[1]) == old[1] && (curr[2]) == old[2])
{
Color_Pixel(x, y);
Flood_Fill(x+1, y);
Flood_Fill(x-1, y);
Flood_Fill(x, y+1);
Flood_Fill(x, y-1);
Flood_Fill(x+1, y+1);
Flood_Fill(x+1, y-1);
Flood_Fill(x-1, y+1);
Flood_Fill(x-1, y-1);
}
}
void mouse(int btn, int state, int x, int y)
{
if(btn == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
Flood_Fill(x, 500-y);
}
void init()
{
glClearColor(0.101, 1.0, 0.980, 1.0); //Background color - cyan
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0, 500, 0, 500);
}
int main(int argc, char** argv)
{
printf("Enter Polygon Coordinates: ");
scanf("%d%d%d%d", &xmin ,&ymin,&xmax,&ymax);
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(500, 500);
glutCreateWindow("Flood-Fill Algorithm");
init();
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMainLoop();
return 0;
}