From: James Bunton <jamesbunton@fastmail.fm>
Date: Sat, 23 Jun 2007 11:56:16 +0000 (+1000)
Subject: Pong is cool
X-Git-Url: https://code.delx.au/pong/commitdiff_plain/1f79e0369a99eb21a663942e15e836223353ff5f

Pong is cool
---

1f79e0369a99eb21a663942e15e836223353ff5f
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..6961497
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,10 @@
+PROJECT(Pong)
+ADD_DEFINITIONS( -Wall -W )
+FIND_PACKAGE(OpenGL)
+FIND_PACKAGE(GLU)
+FIND_PACKAGE(GLUT)
+SET(GL_ALL ${OPENGL_LIBRARIES} ${GLU_LIBRARIES} ${GLUT_LIBRARIES})
+
+ADD_EXECUTABLE(pong pong.c)
+TARGET_LINK_LIBRARIES(pong ${GL_ALL})
+
diff --git a/pong.c b/pong.c
new file mode 100644
index 0000000..5f5ccf7
--- /dev/null
+++ b/pong.c
@@ -0,0 +1,172 @@
+#if defined(WIN32)
+#pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"")
+#include "glut.h"
+#elif defined(__APPLE__) || defined(MACOSX)
+#include <GLUT/glut.h>
+#else
+#include <GL/glut.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+enum {
+	FRAME=40,
+	HEIGHT=100,
+	PADDLESIZE=10
+};
+
+static int score1;
+static int score2;
+static GLdouble paddle1;
+static GLdouble paddle2;
+static GLdouble ballX;
+static GLdouble ballY;
+static GLdouble ballVecX;
+static GLdouble ballVecY;
+
+
+static void initball(void) {
+	ballX = 0.0;
+	ballY = 0.0;
+	if(ballVecX < 0)
+		ballVecX = -1.0;
+	else
+		ballVecX = 1.0;
+	ballVecY = 1.0;
+}
+
+static void run(void) {
+	// Check for collisions with paddles
+	if(ballVecX < 0 && ballX <= -HEIGHT + -ballVecX * 1.5) {
+		if(ballY >= paddle1 - PADDLESIZE && ballY <= paddle1 + PADDLESIZE) {
+			ballVecX *= -1.15;
+			ballVecY *= 1.15;
+		}
+	}
+	if(ballVecX > 0 && ballX >=  HEIGHT - ballVecX * 1.5) {
+		if(ballY >= paddle2 - PADDLESIZE && ballY <= paddle2 + PADDLESIZE) {
+			ballVecX *= -1.15;
+			ballVecY *= 1.15;
+		}
+	}
+
+	// Check if it's past the top or bottom of the screen
+	if(ballY >= HEIGHT || ballY <= -HEIGHT) {
+		ballVecY *= -1;
+	}
+
+	// Check if it's past the sides of the screen
+	if(ballX >= HEIGHT) {
+		++score1;
+		initball();
+		return;
+	}
+	if(ballX <= -HEIGHT) {
+		++score2;
+		initball();
+		return;
+	}
+
+	// Move the ball
+	ballX += ballVecX;
+	ballY += ballVecY;
+}
+
+static void display(void) {
+	glClear(GL_COLOR_BUFFER_BIT);
+	glColor3d(0.0, 0.0, 0.0);
+
+	// Draw the paddles
+	glLineWidth(2.0);
+	glBegin(GL_LINES);
+	glVertex2d(-HEIGHT + 1, paddle1 - PADDLESIZE);
+	glVertex2d(-HEIGHT + 1, paddle1 + PADDLESIZE);
+	glVertex2d( HEIGHT - 1, paddle2 + PADDLESIZE);
+	glVertex2d( HEIGHT - 1, paddle2 - PADDLESIZE);
+	glEnd();
+
+	// Draw the ball
+	glPointSize(5.0);
+	glBegin(GL_POINTS);
+	glVertex2d(ballX, ballY);
+	glEnd();
+
+	// Write the score
+	glRasterPos2d(-5.0, HEIGHT - 10.0);
+	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, '0' + score1);
+	glRasterPos2d( 5.0, HEIGHT - 10.0);
+	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, '0' + score2);
+
+	glutSwapBuffers();
+}
+
+static void resize(int w, int h) {
+	glViewport(0, 0, w, h);
+	glLoadIdentity();
+	glOrtho(-HEIGHT, HEIGHT, -HEIGHT, HEIGHT, -1.0, 1.0);
+}
+
+static void keyboard(unsigned char key, int x, int y) {
+	(void)x;(void)y;
+
+	switch(key) {
+		case 'q':
+		case 'Q':
+		case '\033':
+			exit(0);
+
+		case 'w':
+			if(paddle1 + PADDLESIZE < HEIGHT)
+				paddle1 += PADDLESIZE;
+			break;
+		case 's':
+			if(paddle1 - PADDLESIZE > -HEIGHT)
+				paddle1 -= PADDLESIZE;
+			break;
+
+		case 'i':
+			if(paddle2 + PADDLESIZE < HEIGHT)
+				paddle2 += PADDLESIZE;
+			break;
+		case 'k':
+			if(paddle2 - PADDLESIZE > -HEIGHT)
+				paddle2 -= PADDLESIZE;
+			break;
+
+		default:
+			return;
+	}
+	glutPostRedisplay();
+}
+
+static void timer(int lastTime) {
+	int curTime = glutGet(GLUT_ELAPSED_TIME);
+	do {
+		lastTime += FRAME;
+		run();
+	} while(lastTime + FRAME < curTime);
+	glutPostRedisplay();
+	glutTimerFunc(FRAME - (curTime - lastTime), timer, curTime);
+}
+
+static void init(void) {
+	glClearColor(1.0, 1.0, 1.0, 0.0);
+	initball();
+}
+
+int main(int argc, char *argv[]) {
+	glutInitWindowPosition(100, 100);
+	glutInitWindowSize(640, 480);
+	glutInit(&argc, argv);
+	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
+	glutCreateWindow(argv[0]);
+	glutDisplayFunc(display);
+	glutReshapeFunc(resize);
+	glutKeyboardFunc(keyboard);
+	glutTimerFunc(FRAME, timer, glutGet(GLUT_ELAPSED_TIME));
+	init();
+	glutMainLoop();
+	return 0;
+}
+