8. poligon clipping.cpp

#include <iostream>
#include <math.h>
#include <time.h>
#include <GL/glut.h>
   using namespace std;
   int wxmin = 200, wxmax = 500, wymax = 350, wymin = 100;
   int points[10][2];
   int edge;
   
   void init()
   {
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glMatrixMode(GL_PROJECTION);
    gluOrtho2D(0, 640, 0, 480);
    glClear(GL_COLOR_BUFFER_BIT);
    }
    void Draw()
    {
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.2, 0.2, 1);
    glBegin(GL_POLYGON);
    for (int i = 0; i < edge; i++)
    {
    glVertex2i(points[i][0], points[i][1]);
     }
    glEnd();
    glFlush();
   glColor3f(0, 1, 0);
glBegin(GL_LINE_LOOP);
glVertex2i(200, 100);
glVertex2i(500, 100);
glVertex2i(500, 350);
glVertex2i(200, 350);
glEnd();
glFlush();}
int BottomCliping(int e)
{
float m = 0;
int x = 0, k = 0;
int t[10][2];
for (int i = 0; i < e; i++)
{
if (points[i][1] < wymin)
{
if (points[i + 1][1] < wymin)
{
}
else if (points[i + 1][1] > wymin)
{
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
x = ((1 / ((y2 - y1) / (x2 - x1))) * (wymin - y1)) + x1;
t[k][0] = x;
t[k][1] = wymin;
k++;
}
}
else if (points[i][1] > wymin)
{
if (points[i + 1][1] > wymin)
{
t[k][0] = points[i][0];
t[k][1] = points[i][1];
k++;
}
else if (points[i + 1][1] < wymin)
{float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
x = ((1 / ((y2 - y1) / (x2 - x1))) * (wymin - y1)) + x1;
t[k][0] = x1;
t[k][1] = y1;
k++;
t[k][0] = x;
t[k][1] = wymin;
k++;
}
}
}
cout << "k = " << k;
for (int i = 0; i < 10; i++)
{
points[i][0] = 0;
points[i][1] = 0;
}
for (int i = 0; i < k; i++)
{
cout << "\n"
<< t[i][0] << " " << t[i][1];
points[i][0] = t[i][0];
points[i][1] = t[i][1];
}
points[k][0] = points[0][0];
points[k][1] = points[0][1];
return k;
}
int TopCliping(int e)
{float m = 0;
int x = 0, k = 0;
int t[10][2];
for (int i = 0; i < e; i++)
{
if (points[i][1] > wymax)
{
if (points[i + 1][1] > wymax)
{
}
else if (points[i + 1][1] < wymax)
{
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
x = ((1 / ((y2 - y1) / (x2 - x1))) * (wymax - y1)) + x1;
t[k][0] = x;
t[k][1] = wymax;
k++;
}
}
else if (points[i][1] < wymax)
{
if (points[i + 1][1] < wymax)
{
t[k][0] = points[i][0];
t[k][1] = points[i][1];
k++;
}
else if (points[i + 1][1] > wymax)
{
float x1, x2;
float y1, y2;x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
x = ((1 / ((y2 - y1) / (x2 - x1))) * (wymax - y1)) + x1;
t[k][0] = x1;
t[k][1] = y1;
k++;
t[k][0] = x;
t[k][1] = wymax;
k++;
}
}
}
cout << "k = " << k;
for (int i = 0; i < 10; i++)
{
points[i][0] = 0;
points[i][1] = 0;
}
for (int i = 0; i < k; i++)
{
cout << "\n"
<< t[i][0] << " " << t[i][1];
points[i][0] = t[i][0];
points[i][1] = t[i][1];
}
points[k][0] = points[0][0];
points[k][1] = points[0][1];
return k;
}
int leftCliping(int e)
{
float m = 0;
int y = 0, k = 0;
int t[10][2];for (int i = 0; i < e; i++)
{
if (points[i][0] < wxmin)
{
if (points[i + 1][0] < wxmin)
{
cout << "\n Test 1";
}
else if (points[i + 1][0] > wxmin)
{
cout << "\n Test 2";
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
y = (((y2 - y1) / (x2 - x1)) * (wxmin - x1)) + y1;
t[k][0] = wxmin;
t[k][1] = y;
k++;
}
}
else if (points[i][0] > wxmin)
{
if (points[i + 1][0] > wxmin)
{
t[k][0] = points[i][0];
t[k][1] = points[i][1];
k++;
}
else if (points[i + 1][0] < wxmin)
{
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];x2 = points[i + 1][0];
y2 = points[i + 1][1];
y = ((y2 - y1) / (x2 - x1) * (wxmin - x1)) + y1;
t[k][0] = x1;
t[k][1] = y1;
k++;
t[k][0] = wxmin;
t[k][1] = y;
k++;
}
}
}
cout << "k = " << k;
for (int i = 0; i < 10; i++)
{
points[i][0] = 0;
points[i][1] = 0;
}
for (int i = 0; i < k; i++)
{
cout << "\n"
<< t[i][0] << " " << t[i][1];
points[i][0] = t[i][0];
points[i][1] = t[i][1];
}
points[k][0] = points[0][0];
points[k][1] = points[0][1];
return k;
}
int RightCliping(int e)
{
float m = 0;
int y = 0, k = 0;
int t[10][2];
for (int i = 0; i < e; i++)
{
if (points[i][0] > wxmax){
if (points[i + 1][0] > wxmax)
{
}
else if (points[i + 1][0] < wxmax)
{
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
y = (((y2 - y1) / (x2 - x1)) * (wxmax - x1)) + y1;
t[k][0] = wxmax;
t[k][1] = y;
k++;
}
}
else if (points[i][0] < wxmax)
{
if (points[i + 1][0] < wxmax)
{
t[k][0] = points[i][0];
t[k][1] = points[i][1];
k++;
}
else if (points[i + 1][0] > wxmax)
{
float x1, x2;
float y1, y2;
x1 = points[i][0];
y1 = points[i][1];
x2 = points[i + 1][0];
y2 = points[i + 1][1];
y = ((y2 - y1) / (x2 - x1) * (wxmax - x1)) + y1;
t[k][0] = x1;t[k][1] = y1;
k++;
t[k][0] = wxmax;
t[k][1] = y;
k++;
}
}
}
cout << "k = " << k;
for (int i = 0; i < 10; i++)
{
points[i][0] = 0;
points[i][1] = 0;
}
for (int i = 0; i < k; i++)
{
cout << "\n"
<< t[i][0] << " " << t[i][1];
points[i][0] = t[i][0];
points[i][1] = t[i][1];
}
points[k][0] = points[0][0];
points[k][1] = points[0][1];
return k;
}
void P_C(){
Draw();
}
void goMenu(int value){
switch (value){
case 1:
edge = leftCliping(edge);
Draw();
break;
case 2:
edge = RightCliping(edge);
Draw();break;
case 3:
edge = TopCliping(edge);
Draw();
break;
case 4:
edge = BottomCliping(edge);
Draw();
break;
}
glutPostRedisplay();
}
int main(int argc, char **argv){
cout << "\n Enter No of edges of polygon ";
cin >> edge;
for (int i = 0; i < edge; i++){
cout << "\n Enter point " << i << " x space y ";
cin >> points[i][0] >> points[i][1];
}
points[edge][0] = points[0][0];
points[edge][1] = points[0][1];
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(640, 480);
glutInitWindowPosition(200, 200);
glutCreateWindow("Polygon Clipping");
init();
glutCreateMenu(goMenu);
glutAddMenuEntry("Left", 1);
glutAddMenuEntry("Right", 2);
glutAddMenuEntry("Top", 3);
glutAddMenuEntry("Bottom", 4);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutDisplayFunc(P_C);
glutMainLoop();
return 0;
}