Pixel Cohesion screen sizing implementation

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/JavaProjectTemplate.java

@@ -25,10 +25,8 @@ class Player{
 
 public class JavaProjectTemplate {
 	public static final String PROGRAM_NAME="Sig's Java Project Template";
-	public static int WINDOW_WIDTH=256;
-	public static int WINDOW_HEIGHT=240;
-	public static int PIXEL_SIZE_X=4;
-	public static int PIXEL_SIZE_Y=4;
+	public static int WINDOW_WIDTH=1280;
+	public static int WINDOW_HEIGHT=720;
 	public static Panel game;
 
 	Player pl = new Player();

src/sig/engine/Panel.java

@@ -66,8 +66,28 @@ public class Panel extends JPanel implements Runnable,KeyListener {
 	public static JFrame f;
 
 	int ACTUAL_WINDOW_WIDTH,ACTUAL_WINDOW_HEIGHT;
+	Point<Integer> vViewSize = new Point<Integer>(1,1);
+	Point<Integer> vViewPos = new Point<Integer>(1,1);
 
 	static Cursor currentCursor = new Cursor(Cursor.DEFAULT_CURSOR);
+	// Recursive function to return gcd of a and b in single line
+	static int gcd(int a, int b)
+	{
+		return b == 0 ? a : gcd(b, a % b);
+	}
+
+	static void setupNonPixelCohesion(){
+		Dimension d = p.getSize();
+		int ww = JavaProjectTemplate.WINDOW_WIDTH;
+		int wh = JavaProjectTemplate.WINDOW_HEIGHT;
+		double wasp = (double)ww/(double)wh;
+		p.vViewSize.x=(int)d.getWidth();
+		p.vViewSize.y=(int)((double)p.vViewSize.x/wasp);
+		if (p.vViewSize.y>d.getHeight()) {
+			p.vViewSize.y=(int)d.getHeight();
+			p.vViewSize.x=(int)((double)p.vViewSize.y*wasp);
+		}
+	}
 
 	public static void InitializeEngine(JavaProjectTemplate instance){
 		System.setProperty("sun.java2d.transaccel", "True");
@@ -87,36 +107,30 @@ public class Panel extends JPanel implements Runnable,KeyListener {
 		f.setSize(JavaProjectTemplate.WINDOW_WIDTH,JavaProjectTemplate.WINDOW_HEIGHT);
 		f.addComponentListener(new ComponentAdapter() {
 			public void componentResized(ComponentEvent e) {
-				Dimension d = p.getSize();
-				p.pixel=new int[(int)d.getWidth()*(int)d.getHeight()];
-				p.ACTUAL_WINDOW_WIDTH=(int)d.getWidth();
-				p.ACTUAL_WINDOW_HEIGHT=(int)d.getHeight();
-				p.init(false);
-				/*{
-					int32_t ww = vScreenSize.x * vPixelSize.x;
-					int32_t wh = vScreenSize.y * vPixelSize.y;
-					float wasp = (float)ww / (float)wh;
-
-					if (bPixelCohesion)
-					{
-						vScreenPixelSize = (vWindowSize / vScreenSize);
-						vViewSize = (vWindowSize / vScreenSize) * vScreenSize;
-					}
-					else
-					{
-						vViewSize.x = (int32_t)vWindowSize.x;
-						vViewSize.y = (int32_t)((float)vViewSize.x / wasp);
+				p.ACTUAL_WINDOW_WIDTH=JavaProjectTemplate.WINDOW_WIDTH;
+				p.ACTUAL_WINDOW_HEIGHT=JavaProjectTemplate.WINDOW_HEIGHT;
+				int bw = p.ACTUAL_WINDOW_WIDTH;
+				int bh = p.ACTUAL_WINDOW_HEIGHT;
 
-						if (vViewSize.y > vWindowSize.y)
-						{
-							vViewSize.y = vWindowSize.y;
-							vViewSize.x = (int32_t)((float)vViewSize.y * wasp);
+				Dimension d = p.getSize();
+				int xmult = (int)d.getWidth()/bw;
+				if (xmult!=0) {
+					p.vViewSize.x=(int)(d.getWidth()/bw)*bw;
+					p.vViewSize.y=bh*xmult;
+					if (d.getWidth()/bw>d.getHeight()/bh){
+						int ymult=(int)d.getHeight()/bh;
+						if (ymult==0) {
+							setupNonPixelCohesion();
+						} else {
+							p.vViewSize.y=(int)(d.getHeight()/bh)*bh;
+							p.vViewSize.x=bw*ymult;
 						}
 					}
-
-					vViewPos = (vWindowSize - vViewSize) / 2;
+				} else {
+					setupNonPixelCohesion();
 				}
-				 */
+				p.vViewPos.set((int)((d.getWidth()-p.vViewSize.x)/2),(int)((d.getHeight()-p.vViewSize.y)/2));
+				p.init(false);
 			}
 		});
 		p = new Panel(f);
@@ -254,7 +268,9 @@ public class Panel extends JPanel implements Runnable,KeyListener {
         mImageProducer =  new MemoryImageSource(ACTUAL_WINDOW_WIDTH, ACTUAL_WINDOW_HEIGHT, cm, pixel,0, ACTUAL_WINDOW_WIDTH);
         mImageProducer.setAnimated(true);
         mImageProducer.setFullBufferUpdates(true);  
-        imageBuffer = Toolkit.getDefaultToolkit().createImage(mImageProducer);
+		if (p.ACTUAL_WINDOW_WIDTH!=0&&p.ACTUAL_WINDOW_HEIGHT!=0) {
+        	imageBuffer = Toolkit.getDefaultToolkit().createImage(mImageProducer).getScaledInstance(ACTUAL_WINDOW_WIDTH,ACTUAL_WINDOW_HEIGHT,Image.SCALE_FAST);
+		}
         if(runThread && thread.isInterrupted() || !thread.isAlive()){
             thread.start();
         } 
@@ -264,7 +280,8 @@ public class Panel extends JPanel implements Runnable,KeyListener {
     public void paintComponent(Graphics g) {
 		// perform draws on pixels
 		long startTime = System.currentTimeMillis();
-		g.drawImage(this.imageBuffer,0,0,ACTUAL_WINDOW_WIDTH,ACTUAL_WINDOW_HEIGHT,0,0,ACTUAL_WINDOW_WIDTH,ACTUAL_WINDOW_HEIGHT,this);
+		g.fillRect(0,0,getWidth(),getHeight());
+		g.drawImage(imageBuffer,vViewPos.x,vViewPos.y,vViewSize.x+vViewPos.x,vViewSize.y+vViewPos.y,0,0,ACTUAL_WINDOW_WIDTH,ACTUAL_WINDOW_HEIGHT,this);
 		scaleTime=System.currentTimeMillis()-startTime;
     }