/*
* Copyright (c) 2013, Oskar Veerhoek
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of the FreeBSD Project.
*/
package episode_8;
import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import static org.lwjgl.opengl.GL11.*;
/**
* Shows the use of an entity driven game engine
*
* @author Oskar
*/
public class EntityDemo {
private static long lastFrame;
private static long getTime() {
return (Sys.getTime() * 1000) / Sys.getTimerResolution();
}
private static int getDelta() {
long currentTime = getTime();
int delta = (int) (currentTime - lastFrame);
lastFrame = getTime();
return delta;
}
private static class Box extends AbstractMovableEntity {
public Box(double x, double y, double width, double height) {
super(x, y, width, height);
}
@Override
public void draw() {
glRectd(x, y, x + width, y + height);
}
}
private static class Point extends AbstractEntity {
public Point(double x, double y) {
super(x, y, 1, 1);
}
@Override
public void draw() {
glBegin(GL_POINTS);
glVertex2d(x, y);
glEnd();
}
@Override
public void update(int delta) {
// Do nothing
}
}
public static void main(String[] args) {
try {
Display.setDisplayMode(new DisplayMode(640, 480));
Display.setTitle("Entity Demo");
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
}
// Initialization code Entities
MoveableEntity box = new Box(100, 100, 50, 50);
Entity point = new Point(10, 10);
// Initialization code OpenGL
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 640, 480, 0, 1, -1);
glMatrixMode(GL_MODELVIEW);
lastFrame = getTime();
while (!Display.isCloseRequested()) {
// Render
point.setLocation(Mouse.getX(), 480 - Mouse.getY() - 1);
glClear(GL_COLOR_BUFFER_BIT);
int delta = getDelta();
box.update(delta);
point.update(delta);
if (box.intersects(point)) {
box.setDX(0.2);
}
point.draw();
box.draw();
Display.update();
Display.sync(60);
}
Display.destroy();
System.exit(0);
}
}