/*
* 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_7;
import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import static org.lwjgl.opengl.GL11.*;
/**
* Shows framerate-independent movement
*
* @author Oskar
*/
public class TimerDemo {
private static long lastFrame;
private static long getTime() {
return (Sys.getTime() * 1000) / Sys.getTimerResolution();
}
private static double getDelta() {
long currentTime = getTime();
double delta = (double) (currentTime - lastFrame);
lastFrame = getTime();
return delta;
}
public static void main(String[] args) {
try {
Display.setDisplayMode(new DisplayMode(640, 480));
Display.setTitle("Timer Demo");
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
}
int x = 100;
int y = 100;
int dx = 1;
int dy = 1;
// Initialization code OpenGL
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 640, 480, 0, 1, -1);
glMatrixMode(GL_MODELVIEW);
lastFrame = getTime();
while (!Display.isCloseRequested()) {
// Render
glClear(GL_COLOR_BUFFER_BIT);
double delta = getDelta();
x += delta * dx * 0.1;
y += delta * dy * 0.1;
glRecti(x, y, x + 30, y + 30);
Display.update();
Display.sync(60);
}
Display.destroy();
System.exit(0);
}
}
interface Entity2D {
public float getX();
public float getY();
public void setX(float x);
public void setY(float y);
public void setLocation(float x, float y);
public void setUp();
public void destroy();
public void draw();
}
abstract class AbstractEntity2D implements Entity2D {
float x;
float y;
public float getX() {
return x;
}
public float getY() {
return y;
}
public void setX(float x) {
this.x = x;
}
public void setY(float y) {
this.y = y;
}
public void setLocation(float x, float y) {
this.x = x;
this.y = y;
}
public abstract void setUp();
public abstract void destroy();
public abstract void draw();
}
class Box2D extends AbstractEntity2D {
private final float size;
public Box2D(float x, float y, float size) {
this.x = x;
this.y = y;
this.size = size;
}
public Box2D() {
this.x = this.y = this.size = 0;
}
@Override
public void setUp() {
// We don't need anything here for a box
}
@Override
public void destroy() {
// We don't need anything here for a box
}
@Override
public void draw() {
glBegin(GL_TRIANGLES);
glVertex2f(x + size / 2, y + size / 2);
glVertex2f(x + size / 2, y - size / 2);
glVertex2f(x - size / 2, y - size / 2);
glVertex2f(x - size / 2, y - size / 2);
glVertex2f(x - size / 2, y + size / 2);
glVertex2f(x + size / 2, y + size / 2);
glEnd();
}
}