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7.cpp
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7.cpp
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#include<glut.h>
#include<iostream>
#include<algorithm>
#include<Windows.h>
using namespace std;
int xmin, ymin, xmax, ymax;
int x[100], y[100];
int intx[10] = { 0 };
int n;
int m;
void draw_line(float x1, float y1, float x2, float y2)
{
Sleep(100);
glColor3f(0, 0, 1);
glBegin(GL_LINES);
glVertex2f(x1, y1);
glVertex2f(x2, y2);
glEnd();
glFlush();
}
void edgeDetect(int x1, int y1, int x2, int y2, int scanline) {
int temp;
if (y2 < y1) {
temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
y1 = y2;
y2 = temp;
}
if (scanline > y1 && scanline < y2) {
intx[m++] = x1 + (scanline - y1) * (x2 - x1) / (y2 - y1);
}
}
void scanfill(int x[], int y[]) {
int s1,i;
for (s1 = 0;s1 < 500;s1++) {
m = 0;
for (i = 0;i < n;i++) {
edgeDetect(x[i], y[i], x[(i + 1) % n], y[(i + 1) % n], s1);
}
std::sort(intx, intx + m);
for (i = 0;i < m;i++) {
draw_line(intx[i], s1, intx[(i + 1)%m], s1);
}
}
}
void display() {
int i;
glBegin(GL_LINE_LOOP);
for (i = 0;i < n;i++) {
glVertex2i(x[i], y[i]);
}
glEnd();
scanfill(x, y);
glFlush();
}
void myInit() {
glClearColor(1, 1, 1, 1);
gluOrtho2D(0, 500, 0, 500);
glColor3f(1, 0, 0);
}
int main(int argc, char* argv[]) {
cout << "Enter no of edges:";
cin >> n;
int i;
for (i = 0;i < n;i++) {
cout << "Enter coordinates:";
cin >> x[i] >> y[i];
}
glutInit(&argc, argv);
glutInitWindowSize(500,500);
glutInitWindowPosition(100,100);
glutCreateWindow("Scanline");
glutDisplayFunc(display);
myInit();
glutMainLoop();
}