thib8956/new-shapes

Table of Contents

Plan: Resize Shapes

Overview
Current State
Implementation Plan

1. ResizeHandle enum
2. Controller changes
3. Shape interface changes
4. Visual feedback

Files to modify
Alternative consideration

Plan: Resize Shapes

Overview

Add the ability to resize shapes by dragging corner handles on selected shapes.

Current State

Selection already draws red corner handles via ShapeDraftman.drawHandlerIfSelected()
Controller handles mouse events for selection and moving
Selection uses SelectionAttributes on shapes

Implementation Plan

1. ResizeHandle enum

Create ResizeHandle enum in shapes/ package with positions: NW, N, NE, E, SE, S, SW, W
Each handle knows its cursor type

2. Controller changes

Add mouse state: resizing (boolean), activeHandle (ResizeHandle), resizeOrigin (Point)
Add getHandleAt(Point) method to find which handle is clicked
Modify mouse handlers:
- mousePressed: If click is on a handle, enter resize mode
- mouseDragged: If resizing, calculate delta and call shape's resize method
- mouseReleased: Exit resize mode
Add cursor changes based on handle position

3. Shape interface changes

Add resize(ResizeHandle handle, int dx, int dy) method to Shape interface
Implement in AbstractShape or each concrete shape
For basic shapes (rectangle, circle, triangle):
- Rectangle: adjust width/height based on handle
- Circle: adjust radius (maintain aspect ratio or allow ellipse)
- Triangle: adjust vertices

4. Visual feedback

Update ShapeDraftman to use different handle positions (not just corners)
Consider showing resize preview during drag

Files to modify

shapes/Shape.java - add resize method
ui/Controller.java - mouse handling for resize
shapes/SRectangle.java, SCircle.java, STriangle.java - implement resize logic

Alternative consideration

Could use a separate Resizer class to keep Controller clean
Could implement resize in AbstractShape for common logic