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Source.cpp
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//Jeff Chastine
#include <GL\freeglut.h>
using namespace std;
#define w 500
#define h 500
float step;
bool flag = false;
void myInit(void)
{
glClearColor(1.0, 1.0, 1.0, 0.0);
glColor3f(0.0f, 0.0f, 0.0f);
glPointSize(2.5);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-w, w, -h, h);
}
void setpixel(int x, int y)
{
glBegin(GL_POINTS);
glVertex2f(x, y);
glEnd();
glFlush();
}
void circlePlotPoints(int xCenter, int yCenter, int x, int y)
{
setpixel(xCenter + x, yCenter + y);
setpixel(xCenter - x, yCenter + y);
setpixel(xCenter + x, yCenter - y);
setpixel(xCenter - x, yCenter - y);
setpixel(xCenter + y, yCenter + x);
setpixel(xCenter - y, yCenter + x);
setpixel(xCenter + y, yCenter - x);
setpixel(xCenter - y, yCenter - x);
}
void circleMidpoint(int xCenter, int yCenter, int radius)
{
int x = 0;
int y = radius;
int f = 1 - radius;
circlePlotPoints(xCenter, yCenter, x, y);
while (x < y) {
x++;
if (f < 0)
f += 2 * x + 1;
else {
y--;
f += 2 * (x - y) + 1;
}
circlePlotPoints(xCenter, yCenter, x, y);
}
}
void fillcircle(int x, int y, int re, float r, float g, float b, float size)
{
glColor3f(r, g, b);
glPointSize(size);
glBegin(GL_POINTS);
for (int i = re; i >= 0; i -= size)
circleMidpoint(x, y, i);
glClearColor(1.0, 1.0, 1.0, 0.0);
glColor3f(0.0f, 0.0f, 0.0f);
glPointSize(2.5);
}
void smilePlotPoints(int xCenter, int yCenter, int x, int y)
{
setpixel(xCenter + x, yCenter - y);
setpixel(xCenter - x, yCenter - y);
}
void smile(int xCenter, int yCenter, int radius)
{
int x = 0;
int y = radius;
int f = 1 - radius;
smilePlotPoints(xCenter, yCenter, x, y);
while (x < y) {
x++;
if (f < 0)
f += 2 * x + 1;
else {
y--;
f += 2 * (x - y) + 1;
}
smilePlotPoints(xCenter, yCenter, x, y);
}
}
void refsmilePlotPoints(int xCenter, int yCenter, int x, int y)
{
setpixel(xCenter + x, yCenter + y);
setpixel(xCenter - x, yCenter + y);
}
void refsmile(int xCenter, int yCenter, int radius)
{
int x = 0;
int y = radius;
int f = 1 - radius;
refsmilePlotPoints(xCenter, yCenter, x, y);
while (x < y) {
x++;
if (f < 0)
f += 2 * x + 1;
else {
y--;
f += 2 * (x - y) + 1;
}
refsmilePlotPoints(xCenter, yCenter, x, y);
}
}
void myDisplay(void)
{
if (!flag)
for (step = 70; step <= 300; step += 50)
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_POINTS);
circleMidpoint(-200, 50 + step, 100);
fillcircle(-200, 50 + step, 100, 1, 1, 0, 20);
fillcircle(-150, 90 + step, 10, 0, 0, 0, 2);
fillcircle(-250, 90 + step, 10, 0, 0, 0, 2);
smile(-200, 50 + step, 75);
circleMidpoint(-200, -50 - step, 100);
fillcircle(-200, -50 - step, 100, 1, 1, 0.4, 20);
fillcircle(-150, -90 - step, 10, 0, 0, 0, 2);
fillcircle(-250, -90 - step, 10, 0, 0, 0, 2);
refsmile(-200, -50 - step, 75);
glEnd();
glFlush();
}
flag = true;
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(800, 800);
glutInitWindowPosition(500, 00);
glutCreateWindow("smiley sun");
myInit();
glutDisplayFunc(myDisplay);
glutMainLoop();
}