zooming in CameraPanel.java with new methods and more efficient rendering!

.gitignore

@@ -45,4 +45,7 @@ dependency-reduced-pom.xml
 .idea
 
 ## This is for our app, cause it likes to store stuff ##
-network_cameras.json
+network_cameras.json
+
+## exec launch4j config ##
+execfg.xml

src/main/java/io/swtc/proccessing/CameraPanel.java

@@ -1,30 +1,106 @@
 package io.swtc.proccessing;
 
+import io.swtc.proccessing.ui.ShowError;
+
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.*;
+import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
+import java.util.Arrays;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Function;
 
-/**
- * Enhanced CameraPanel with support for custom image processors
- */
 public class CameraPanel extends JPanel {
 
     private volatile BufferedImage sourceImage;
     private volatile BufferedImage processedImage;
-
     private Function<BufferedImage, BufferedImage> imageProcessor;
     private final AtomicBoolean repaintScheduled = new AtomicBoolean(false);
 
+    private double zoomLevel = 1.0;
+    private double xOffset = 0;
+    private double yOffset = 0;
+    private Point dragStartPoint;
+
+    private static final double MIN_ZOOM = 1.0;
+    private static final double MAX_ZOOM = 10.0; // ten is enough if ur using 640x480
+    private static final double ZOOM_MULTIPLIER = 1.1;
+
     public CameraPanel() {
         setBackground(Color.BLACK);
         setPreferredSize(new Dimension(640, 480));
+
+        initInteractionListeners();
+    }
+
+    private void initInteractionListeners() {
+        MouseAdapter mouseHandler = new MouseAdapter() {
+            @Override
+            public void mouseWheelMoved(MouseWheelEvent e) {
+                handleZoom(e);
+            }
+
+            @Override
+            public void mousePressed(MouseEvent e) {
+                dragStartPoint = e.getPoint();
+                setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
+            }
+
+            @Override
+            public void mouseClicked(MouseEvent e) {
+                if (e.getClickCount() == 2)
+                    resetView();
+            }
+
+            @Override
+            public void mouseReleased(MouseEvent e) { setCursor(Cursor.getDefaultCursor()); }
+
+            @Override
+            public void mouseDragged(MouseEvent e) {
+                handlePan(e);
+            }
+
+            @Override
+            public void mouseExited(MouseEvent e) { setCursor(Cursor.getDefaultCursor()); }
+        };
+
+        addMouseWheelListener(mouseHandler);
+        addMouseListener(mouseHandler);
+        addMouseMotionListener(mouseHandler);
     }
 
     public void setImage(BufferedImage img) {
         sourceImage = img;
+        updateProcessedImage();
 
+        scheduleRepaint();
+    }
+
+    public void setImageProcessor(Function<BufferedImage, BufferedImage> processor) {
+        this.imageProcessor = processor;
+        if (sourceImage != null) {
+            updateProcessedImage();
+            scheduleRepaint();
+        }
+    }
+
+    private void updateProcessedImage() {
+        if (sourceImage == null) return;
+
+        if (imageProcessor != null) {
+            try {
+                processedImage = imageProcessor.apply(sourceImage);
+            } catch (Exception e) {
+                ShowError.error(null,"Fucked up in rendering \n" + Arrays.toString(e.getStackTrace()),"Problem");
+                processedImage = sourceImage; // Fallback
+            }
+        } else {
+            processedImage = sourceImage;
+        }
+    }
+
+    private void scheduleRepaint() {
         if (repaintScheduled.compareAndSet(false, true)) {
             SwingUtilities.invokeLater(() -> {
                 repaintScheduled.set(false);
@@ -33,37 +109,100 @@ public class CameraPanel extends JPanel {
         }
     }
 
-    public void setImageProcessor(Function<BufferedImage, BufferedImage> processor) {
-        this.imageProcessor = processor;
+    private void handleZoom(MouseWheelEvent e) {
+        if (processedImage == null) return;
+
+        double oldZoom = zoomLevel;
+
+        if (e.getWheelRotation() < 0) {
+            zoomLevel *= ZOOM_MULTIPLIER; // Zoom In
+        } else {
+            zoomLevel /= ZOOM_MULTIPLIER; // Zoom Out
+        }
+
+        // clamp shit
+        zoomLevel = Math.max(MIN_ZOOM, Math.min(MAX_ZOOM, zoomLevel));
+
+        if (oldZoom != zoomLevel) {
+            double xRel = e.getX() - xOffset;
+            double yRel = e.getY() - yOffset;
+
+            double zoomFactor = zoomLevel / oldZoom;
+
+            xOffset = e.getX() - (xRel * zoomFactor);
+            yOffset = e.getY() - (yRel * zoomFactor);
+
+            checkBounds();
+            repaint();
+        }
+    }
+
+    private void handlePan(MouseEvent e) {
+        if (processedImage == null || dragStartPoint == null) return;
+
+        // Calculate delta
+        int dx = e.getX() - dragStartPoint.x;
+        int dy = e.getY() - dragStartPoint.y;
+
+        xOffset += dx;
+        yOffset += dy;
+
+        dragStartPoint = e.getPoint();
+
+        checkBounds();
+        repaint();
+    }
+
+    private void checkBounds() {
+        double viewedWidth = getWidth() * zoomLevel;
+        double viewedHeight = getHeight() * zoomLevel;
+
+        if (xOffset > 0) xOffset = 0;
+        if (yOffset > 0) yOffset = 0;
+
+        if (xOffset + viewedWidth < getWidth()) {
+            xOffset = getWidth() - viewedWidth;
+        }
+        if (yOffset + viewedHeight < getHeight()) {
+            yOffset = getHeight() - viewedHeight;
+        }
     }
 
     @Override
     protected void paintComponent(Graphics g) {
         super.paintComponent(g);
 
-        BufferedImage src = sourceImage;
-        if (src == null) return;
-
-        BufferedImage img = src;
-
-        if (imageProcessor != null) {
-            // we only apply the proccessor if it is present
-            // that is due too CPU Usage ; This project was built for a DUAL Core CPU, not a quad or even 6 Core CPU
-            img = imageProcessor.apply(src);
-        }
-
-        processedImage = img;
+        if (processedImage == null) return;
 
         Graphics2D g2d = (Graphics2D) g;
+
+        AffineTransform originalTransform = g2d.getTransform();
+
         g2d.setRenderingHint(
                 RenderingHints.KEY_INTERPOLATION,
                 RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR
         );
 
-        g2d.drawImage(img, 0, 0, getWidth(), getHeight(), null);
+        g2d.translate(xOffset, yOffset);
+
+        double scaleX = (double) getWidth() / processedImage.getWidth();
+        double scaleY = (double) getHeight() / processedImage.getHeight();
+
+        g2d.scale(scaleX * zoomLevel, scaleY * zoomLevel);
+
+        g2d.drawImage(processedImage, 0, 0, null);
+
+        g2d.setTransform(originalTransform);
     }
 
     public BufferedImage getCurrentProcessedImage() {
         return processedImage;
     }
-}
+
+    public void resetView() {
+        zoomLevel = 1.0;
+        xOffset = 0;
+        yOffset = 0;
+        repaint();
+    }
+}