我正在尝试完成一个形状任务的大小调整我几乎得到了我想要的结果,只有在鼠标更改为调整大小光标后拖动才会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：
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();
}
}
知道可能会发生什么吗？
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);
}
}
解决方法:
没有看到代码的这一部分,这只是一个猜测,但我在想你正在ShapetoResize.resizeSE中创建一个新的形状(int x,int y);方法,从而创建两个形状.
我假设它是你自己的方法,因为在Rectangle或接口Shape(两个内置形状)上没有resizeSE可用.当然,接口Shape上没有paint方法,所以你可能也使用了自定义接口(由于你没有为这个Shape接口提供代码,这会让人感到困惑).如果您发布这些方法的代码,我们可以确认.
以下是以工作方式(和SSCCE)将代码放在一起的示例.我仅限于矩形(因为它们是唯一内置的Shape)并且剥离了许多与调整大小无关的东西.如果您仍遇到问题,请尝试使用此示例重新创建问题：
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);
}
}
标签：java,swing 来源： https://codeday.me/bug/20190625/1286851.html
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