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Koch-Curve.cpp
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Koch-Curve.cpp
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#include <GL/glut.h>
#include<bits/stdc++.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
void DrawKochCurve(float startX, float startY, float len, float angle, int n)
{
if (n > 0)
{
len = len / 3.0;
DrawKochCurve(startX, startY, len, angle, n - 1);
startX += len * cos(angle);
startY += len * sin(angle);
DrawKochCurve(startX, startY, len, angle - M_PI / 3.0, n - 1);
startX += len * cos(angle - M_PI / 3.0);
startY += len * sin(angle - M_PI / 3.0);
DrawKochCurve(startX, startY, len, angle + M_PI / 3.0, n - 1);
startX += len * cos(angle + M_PI / 3.0);
startY += len * sin(angle + M_PI / 3.0);
DrawKochCurve(startX, startY, len, angle, n - 1);
}
else
{
glBegin(GL_LINES);
glColor3f(1.0, 1.0, 0.0);
glVertex2f(startX, startY);
float endX = startX + len * cos(angle);
float endY = startY + len * sin(angle);
glVertex2f(endX, endY);
glEnd();
}
}
void Display()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0, 1.0, 0.0);
float startX = -0.5;
float startY = -0.3;
float len = 1.0;
float angle = 0.0;
int n = 3;
DrawKochCurve(startX, startY, len, angle, n);
glFlush();
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(800, 600);
glutCreateWindow("Koch Curve");
glClearColor(0.0, 0.0, 0.0, 0.0);
gluOrtho2D(-1.0, 1.0, -1.0, 1.0);
glutDisplayFunc(Display);
glutMainLoop();
return 0;
}