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bouncing_ball.c
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bouncing_ball.c
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/* Author: NagaChaitaya Vellanki */
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
static float PI = 3.14159265358979323846;
static float RADIUS = 40.0f;
void draw_circle(float x, float y) {
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glLineWidth(4.0f);
glBegin(GL_TRIANGLE_FAN);
for (int radian = 0; radian < 360; radian++)
{
float degree = radian * (PI / 180.0);
glVertex2f(x + RADIUS * cosf(degree), y + RADIUS * sinf(degree));
}
glEnd();
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
int main(int argc, char *argv[]) {
GLFWwindow* window;
if(!glfwInit()) {
return -1;
}
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* vidmode = glfwGetVideoMode(monitor);
window = glfwCreateWindow(vidmode->width, vidmode->height, "Bouncing Ball", monitor, NULL);
if(!window) {
glfwTerminate();
return -1;
}
glfwSetKeyCallback(window, key_callback);
glfwMakeContextCurrent(window);
int width, height;
glfwGetFramebufferSize(window, &width, &height);
float ratio = width / (float) height;
float x = 0.0f;
float y = 0.0f;
float xspeed = 10.0f;
float yspeed = 10.0f;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0f, width, 0.0f, height, 0.0, 1.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
while(!glfwWindowShouldClose(window)) {
glClear(GL_COLOR_BUFFER_BIT);
x = x + xspeed;
y = y + yspeed;
if ((x > width) || (x < 0)) {
xspeed = xspeed * -1;
}
if ((y > height) || (y < 0)) {
yspeed = yspeed * -1;
}
draw_circle(x, y);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}