4

我正在尝试完成形状调整任务我几乎得到了我想要的结果，只有在鼠标变为调整大小光标后才拖动首先绘制另一个相同类型的形状并调整第二个绘制形状的大小。导致这样的图片：

在此处输入图像描述

这是我的相关代码：

  @Override
public void mouseMoved(MouseEvent e) {

    if (e.isControlDown()) {
        updateShapeUnderMouse(e.getX(), e.getY());
    } // deals with drawing shape if control button held

    //deals with identifying shape to resize
        int x = e.getX();
         int y = e.getY();

    for (int i = myShapes.size() - 1; i >= 0; i--) {
        Shape s = (Shape) myShapes.get(i);
            if (s.isedgePoint(x, y)) {
            ShapetoResize = s;
            setCursor(crnw);
            prevDragX = x;
            prevDragY = y;
            return;
        }
    }

@Override
public void mouseDragged(MouseEvent event) {

         if (event.isControlDown()) {
            if (shapeUnderMouse != null) {
            shapeUnderMouse.setXPos(event.getX());
            shapeUnderMouse.setYPos(event.getY());
            repaint();
        }
    } // deals with moving the shape

  //deals with identifying and resizing shape
    int x = event.getX();
    int y = event.getY();

     if (ShapetoResize != null) {
         if (ShapetoResize instanceof Square) {
            ShapetoResize.resizeSE(x - prevDragX, y - prevDragY);
        } else if (ShapetoResize instanceof Rectangle) { // SAME CODE FOR EACH SHAPE
   }

  repaint();
    }
}

知道会发生什么吗？

public ArrayList<Shape> myShapes = new ArrayList();


@Override
public void paintComponent(Graphics g) {

    super.paintComponent(g);
    int length = myShapes.size();

    for (int i = 0; i < length; i++) {

        myShapes.get(i).paint(g);
    }

}
4

2 回答 2

3

没有看到这部分代码，这只是一个猜测，但我认为您正在您的ShapetoResize.resizeSE(int x, int y);方法中创建一个新形状，从而创建两个形状。

我假设这是您自己的方法，因为在或 界面（两个内置形状）上没有resizeSE可用的方法。当然interface 上没有方法，因此您可能也在使用自定义接口（这会令人困惑，因为您没有为此 Shape 接口提供代码）。如果您发布这些方法的代码，我们可以确认。RectangleShapepaintShape

这是一个以工作方式（和 SSCCE）将代码组合在一起的示例。我仅将其限制为 Rectangles（因为它们是唯一内置的Shape）并删除了许多与调整大小无关的内容。如果您仍然遇到问题，请尝试使用以下示例重现问题：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.ArrayList;

public class ShapeResizer extends Box{
    Dimension preferredSize = new Dimension(400,300);
    public ArrayList<Shape> myShapes = new ArrayList();
    //Shape that's targeted for editing
    Shape currentShape;

    public ShapeResizer(){
        super(BoxLayout.X_AXIS);

        //Shapes (because I don't want to make write code for the user to make shapes)
        myShapes.add(new Rectangle(100, 100, 20, 20));
        myShapes.add(new Rectangle(200, 200, 30, 30));

        addMouseMotionListener(new MouseMotionListener() {
            @Override
            public void mouseMoved(MouseEvent e) {

                //deals with identifying shape to resize
                int x = e.getX();
                int y = e.getY();

                boolean foundShape = false;
                for (int i = myShapes.size() - 1; i >= 0; i--) {
                    Shape s = (Shape) myShapes.get(i);
                    if (s.contains(e.getPoint())) {
                        //We found a shape to target
                        currentShape = s;
                        foundShape = true;
                    }
                }

                if(!foundShape){
                    //Reset the shape and cursor only if needed
                    if(currentShape != null){
                        currentShape = null;
                        setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
                    }
                } else {
                    setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR));
                }

            }

            @Override
            public void mouseDragged(MouseEvent event) {
                if (currentShape != null) {
                    resizeShape(currentShape, event.getPoint());
                }
                repaint();
            }
        });
    }

    public void resizeShape(Shape s, Point p){
        if(s instanceof Rectangle){
            Rectangle r = (Rectangle)s;
            r.setSize(p.x - r.x, p.y - r.y);
        }
    }

    public void drawShape(Graphics g, Shape s){
        if(s instanceof Rectangle){
            Rectangle r = (Rectangle)s;
            g.drawRect(r.x, r.y, r.width, r.height);
        }
    }

    @Override
    public void paintComponent(Graphics g) {

        super.paintComponent(g);
        int length = myShapes.size();

        for (int i = 0; i < length; i++) {
            drawShape(g, myShapes.get(i));
        }

    }

    public Dimension getPreferredSize(){
        return preferredSize;
    }   

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new ShapeResizer());
        frame.validate();
        frame.pack();
        frame.setVisible(true);
    }
}
于 2012-12-19T18:29:15.640 回答
1

添加形状背后的逻辑是什么？是否通过左键单击绘图画布添加形状？如果是这样，您的问题可能是单击时添加了一个形状，而这就是正在调整大小的形状。您可以通过在拖动对象后中断执行来调试它。您的列表将包含两个形状而不是一个。

于 2012-12-19T14:30:08.037 回答