rectboundedshape.java

JGraph扩展应用。自定义Renderer,自定义视图View实现自定义工作流控件

/*
 * RectBoundedShape.java
 *
 * Created on April 29, 2005, 4:48 PM
 */

package flow.graph.gui.graph.item.unit;

import java.awt.*;
import java.awt.event.MouseEvent;

/**
 *
 * @author hysun
 */
public abstract class RectBoundedShape implements IShape {
    
    protected Color color;
    
    protected Stroke stroke;
    
    protected int startX, startY, endX, endY;
    
    protected RectBoundedShape(Color c, Stroke s, int x, int y) {
        color = c;
        stroke = s;
        startX = endX = x;
        startY = endY = y;
    }
    
    protected RectBoundedShape() {
    }
    
    public void processCursorEvent(MouseEvent e, int t) {
        if (t != IShape.CURSOR_DRAGGED)
            return;
        int x = e.getX();
        int y = e.getY();
        if (e.isShiftDown()) {
            regulateShape(x, y);
        } else {
            endX = x;
            endY = y;
        }
    }
    
    /** 
     * Regulate the bounding rectangle to a square with ending point 
     * coordinate derived from the specified x, y.
     */
    protected void regulateShape(int x, int y) {
        int w = x - startX;
        int h = y - startY;
        int s = Math.min(Math.abs(w), Math.abs(h));
        if (s == 0) {
            endX = startX;
            endY = startY;
        } else {
            endX = startX + s * (w / Math.abs(w));
            endY = startY + s * (h / Math.abs(h));
        }
    }
    
    public String getShapeData() {
        int si = 0;
        for (int i=0; i<DrawingBoard.STROKES.length; i++) {
            if (stroke == DrawingBoard.STROKES[i]) {
                si = i;
                break;
            }
        }
        StringBuffer buffer = new StringBuffer();
        buffer.append(color.getRGB());
        buffer.append(":");
        buffer.append(si);
        buffer.append(":");
        buffer.append(startX);
        buffer.append(":");
        buffer.append(startY);
        buffer.append(":");
        buffer.append(endX);
        buffer.append(":");
        buffer.append(endY);
        return buffer.toString();
    }
    
    public void setShapeData(String data) throws Exception {
        String[] splits = data.split(":");
        color = new Color(Integer.parseInt(splits[0]));
        stroke = DrawingBoard.STROKES[Integer.parseInt(splits[1])];
        startX = Integer.parseInt(splits[2]);
        startY = Integer.parseInt(splits[3]);
        endX = Integer.parseInt(splits[4]);
        endY = Integer.parseInt(splits[5]);
    }
    
}