JFrame, JPanel and mouse handling

src/main/java/com/aparapi/examples/mandel/AfGUI.java

+package com.aparapi.examples.mandel;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionAdapter;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.image.BufferedImage;
+
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public class AfGUI {
+
+	private AfMain main;
+
+	private JFrame frame;
+
+	private int __COLORS=128;
+	private int __BLACK=Color.BLACK.getRGB();
+	
+	private int[] colors=new int[__COLORS];
+	private BufferedImage image;
+	private JPanel panel;
+	
+	boolean dragging = false;
+	private int px;
+	private int py;
+
+
+	public AfGUI(AfMain _main) {
+
+		main = _main;
+		
+		for(int c=0;c<__COLORS;c++)
+		{
+			float hue = (float) c/ (float) __COLORS;
+			float saturation = 1.0f;
+			float brightness = 1.0f;
+			Color color = Color.getHSBColor(hue, saturation, brightness);
+			colors[c] = color.getRGB();
+		}
+		
+
+		frame = new JFrame("Fractals");
+		frame.setSize(main.W, main.H);
+		frame.setBackground(Color.BLACK);
+
+		frame.addWindowListener(new WindowAdapter() {
+			public void windowClosing(WindowEvent windowEvent) {
+				System.exit(0);
+			}
+		});
+
+		panel = new JPanel() {
+			private static final long serialVersionUID = -2006337199526432552L;
+
+			public void paint(Graphics g) {
+				g.drawImage(image, 0, 0, this);
+			}
+		};
+		panel.setBackground(Color.BLACK);
+		panel.setSize(main.W, main.H);
+
+		image = new BufferedImage(main.W, main.H, BufferedImage.TYPE_INT_RGB);
+
+		frame.add(panel);
+
+
+		frame.addMouseWheelListener(new MouseWheelListener() {
+
+			@Override
+			public void mouseWheelMoved(MouseWheelEvent e) {
+
+				e.consume();
+
+				int amount = (e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL) ? e.getUnitsToScroll()
+						: (e.getWheelRotation() < 0 ? -1 : 1);
+
+				System.out.printf("wheel %d \n", amount);
+
+				float zoom = 1f + ((float) amount * 5 / 100f);
+				main.move(main.W / 2, main.H / 2, zoom);
+				main.refresh();
+
+			}
+		});
+
+		frame.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+
+				if (e.getClickCount() == 2 && !e.isConsumed()) {
+                    e.consume();
+                    System.out.println("Double Click");
+    				main.move(e.getPoint().x, main.H - e.getPoint().y , 1f);
+    				main.refresh();
+				}
+
+			}
+		
+			@Override
+			public void mousePressed(MouseEvent e) {
+					
+				System.out.printf("mouse pressed %d %d \n", e.getPoint().x, e.getPoint().y);
+				px = e.getPoint().x;
+				py = e.getPoint().y;
+				dragging=true;
+			}
+
+			 @Override
+			    public void mouseReleased(MouseEvent event) {
+			 
+				 dragging = false;
+			 }
+
+		});
+
+		frame.addMouseMotionListener(new MouseMotionAdapter() {
+			
+			
+			 @Override
+			 public void mouseDragged(MouseEvent e) {
+				 
+				 if(dragging)
+				 {
+					 int nx = e.getPoint().x;
+					 int ny = e.getPoint().y;
+					 
+					 int dx = px - nx;
+					 int dy = py - ny;					 
+						 
+					 System.out.printf("mouse drag %d,%d \n", dx, dy);
+					 main.move(main.W/2 + dx, main.H/2 - dy, 1f);
+					 main.refresh();
+					 
+					 px=nx;
+					 py=ny;
+				 }
+			 } 
+			 
+		});
+
+		frame.setVisible(true);
+		int cw = panel.getWidth();
+		int ch = panel.getHeight();
+		frame.setSize(2 * main.W - cw, 2 * main.H - ch);
+		panel.setSize(main.W, main.H);
+
+	}
+
+	public void setColor(int i, int j, int t) {
+
+		int c = colors[t%__COLORS];
+		
+		if (t >= main.max_iterations) 
+			c = __BLACK;
+
+		image.setRGB(i, main.H - j - 1, c);
+
+	}
+
+	public void refresh() {
+		
+		for (int k = 0; k < main.rgb.length; k++)
+			setColor(k / main.W, k % main.W, main.rgb[k]);
+		
+		panel.repaint();
+
+		System.out.printf("canvas refreshed : %d x %d \n", panel.getWidth(), panel.getHeight());
+
+	}
+
+}