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import java.awt.Canvas;
import java.awt.Graphics2D;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseWheelListener;
import java.awt.event.MouseWheelEvent;
import java.awt.image.BufferStrategy;
import javax.swing.JFrame;
import javax.swing.JPanel;
// TODO: implement pause (rendering) function
public abstract class Scene extends JPanel
implements Runnable, KeyListener, MouseListener,
MouseMotionListener, MouseWheelListener {
protected final long DESIRED_FPS = 60;
protected final long DESIRED_DELTA_LOOP = (1000*1000*1000)/DESIRED_FPS;
// TODO: lowercase not constant values
protected int WIDTH;
protected int HEIGHT;
protected BufferStrategy buffer;
// TODO: remove frame reference
protected JFrame frame;
protected boolean running;
protected Canvas canvas;
// TODO: make accessible from user settings
protected int guiSize = 2;
protected Scene(JFrame frame) {
this.frame = frame;
// getting window size
this.WIDTH = (int) this.frame.getSize().getWidth();
this.HEIGHT = (int) this.frame.getSize().getHeight();
this.canvas = new Canvas();
this.canvas.setBounds(0, 0, this.WIDTH, this.HEIGHT);
this.canvas.setIgnoreRepaint(true);
this.canvas.addKeyListener(this);
this.canvas.addMouseListener(this);
this.canvas.addMouseMotionListener(this);
this.canvas.addMouseWheelListener(this);
}
public void initCanvasBuffer() {
this.canvas.createBufferStrategy(2);
this.buffer = this.canvas.getBufferStrategy();
this.canvas.requestFocus();
}
public void run() {
long beginLoopTime;
long endLoopTime;
long currentUpdateTime = System.nanoTime();
long lastUpdateTime;
long deltaLoop;
this.initCanvasBuffer();
this.running = true;
while (running) {
beginLoopTime = System.nanoTime();
// TODO: use WindowEventListener to wait for changes
//getting window size
this.WIDTH = (int) this.frame.getSize().getWidth();
this.HEIGHT = (int) this.frame.getSize().getHeight();
this.render();
lastUpdateTime = currentUpdateTime;
currentUpdateTime = System.nanoTime();
this.update((int) ((currentUpdateTime - lastUpdateTime)/(1000*1000)));
endLoopTime = System.nanoTime();
deltaLoop = endLoopTime - beginLoopTime;
if (deltaLoop > this.DESIRED_DELTA_LOOP) {
// TODO: late => skip frame
} else {
try {
Thread.sleep((this.DESIRED_DELTA_LOOP - deltaLoop)/(1000*1000));
} catch (InterruptedException e ) {
}
}
}
}
protected abstract void render();
protected abstract void update(int deltaNanoTime);
@Override
public void keyTyped(KeyEvent e) {}
public void keyPressed(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseDragged(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void mouseWheelMoved(MouseWheelEvent e) {}
}
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