implement resize feature

src/main/java/ovh/gasser/newshapes/shapes/AbstractShape.java

@@ -34,6 +34,45 @@ public abstract class AbstractShape implements Shape {
         getBounds().translate(dx, dy);
     }
 
+    @Override
+    public void resize(ResizeHandle handle, int dx, int dy) {
+        Rectangle bounds = getBounds();
+        switch (handle) {
+            case E -> bounds.width += dx;
+            case W -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+            }
+            case S -> bounds.height += dy;
+            case N -> {
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+            case SE -> {
+                bounds.width += dx;
+                bounds.height += dy;
+            }
+            case SW -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+                bounds.height += dy;
+            }
+            case NE -> {
+                bounds.width += dx;
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+            case NW -> {
+                bounds.x += dx;
+                bounds.width -= dx;
+                bounds.y += dy;
+                bounds.height -= dy;
+            }
+        }
+        if (bounds.width < 1) bounds.width = 1;
+        if (bounds.height < 1) bounds.height = 1;
+    }
+
     @Override
     public Rectangle getBounds() {
         return this.bounds;

src/main/java/ovh/gasser/newshapes/shapes/ResizeHandle.java

@@ -0,0 +1,24 @@
+package ovh.gasser.newshapes.shapes;
+
+import java.awt.Cursor;
+
+public enum ResizeHandle {
+    NW(Cursor.NW_RESIZE_CURSOR),
+    N(Cursor.N_RESIZE_CURSOR),
+    NE(Cursor.NE_RESIZE_CURSOR),
+    E(Cursor.E_RESIZE_CURSOR),
+    SE(Cursor.SE_RESIZE_CURSOR),
+    S(Cursor.S_RESIZE_CURSOR),
+    SW(Cursor.SW_RESIZE_CURSOR),
+    W(Cursor.W_RESIZE_CURSOR);
+
+    private final int cursorType;
+
+    ResizeHandle(int cursorType) {
+        this.cursorType = cursorType;
+    }
+
+    public int getCursorType() {
+        return cursorType;
+    }
+}

src/main/java/ovh/gasser/newshapes/shapes/SCircle.java

@@ -8,7 +8,7 @@ import java.awt.*;
 
 public class SCircle extends AbstractShape {
 
-    private final int radius;
+    private int radius;
 
     private SCircle(int x, int y, int radius) {
         super(new Rectangle(x, y, radius * 2, radius * 2));
@@ -20,6 +20,32 @@ public class SCircle extends AbstractShape {
         visitor.visitCircle(this);
     }
 
+    @Override
+    public void resize(ResizeHandle handle, int dx, int dy) {
+        Rectangle bounds = getBounds();
+        int newWidth = bounds.width;
+        int newHeight = bounds.height;
+
+        switch (handle) {
+            case E, W -> newWidth += dx;
+            case N, S -> newHeight += dy;
+            case SE, NW -> {
+                newWidth += dx;
+                newHeight += dy;
+            }
+            case NE, SW -> {
+                newWidth += dx;
+                newHeight += dy;
+            }
+        }
+
+        if (newWidth < 2) newWidth = 2;
+        if (newHeight < 2) newHeight = 2;
+
+        this.radius = Math.max(newWidth, newHeight) / 2;
+        bounds.setSize(this.radius * 2, this.radius * 2);
+    }
+
     @Override
     public Shape clone() {
         var color = (ColorAttributes) getAttributes(ColorAttributes.ID);

src/main/java/ovh/gasser/newshapes/shapes/STriangle.java

@@ -16,6 +16,54 @@ public class STriangle extends AbstractShape {
         visitor.visitTriangle(this);
     }
 
+    @Override
+    public void resize(ResizeHandle handle, int dx, int dy) {
+        Rectangle bounds = getBounds();
+        int delta = Math.max(Math.abs(dx), Math.abs(dy));
+
+        boolean shrink = switch (handle) {
+            case SE -> (dx < 0 || dy < 0);
+            case NW -> (dx > 0 || dy > 0);
+            case NE -> (dx < 0);
+            case SW -> (dx > 0);
+            case E, W -> (dx < 0);
+            case N, S -> (dy < 0);
+            default -> false;
+        };
+
+        int sizeChange = shrink ? -delta : delta;
+
+        switch (handle) {
+            case SE, E, W -> {
+                bounds.width += sizeChange;
+                bounds.height += sizeChange;
+            }
+            case NW -> {
+                bounds.x -= sizeChange;
+                bounds.width += sizeChange;
+                bounds.y -= sizeChange;
+                bounds.height += sizeChange;
+            }
+            case NE -> {
+                bounds.y -= sizeChange;
+                bounds.width += sizeChange;
+                bounds.height += sizeChange;
+            }
+            case SW -> {
+                bounds.x -= sizeChange;
+                bounds.width += sizeChange;
+                bounds.height += sizeChange;
+            }
+            case N, S -> {
+                bounds.width += sizeChange;
+                bounds.height += sizeChange;
+            }
+        }
+
+        if (bounds.width < 1) bounds.width = 1;
+        if (bounds.height < 1) bounds.height = 1;
+    }
+
     @Override
     public Shape clone() {
         var color = (ColorAttributes) getAttributes(ColorAttributes.ID);

src/main/java/ovh/gasser/newshapes/shapes/Shape.java

@@ -8,6 +8,7 @@ import java.awt.*;
 public interface Shape {
     void accept(ShapeVisitor visitor);
     void translate(int dx, int dy);
+    void resize(ResizeHandle handle, int dx, int dy);
     Attributes getAttributes(String key);
     void addAttributes(Attributes attr);
     Rectangle getBounds();