如何在形状中绘制shapens？

Question

我想建立一个应用程序，我打算创建一些基本的动画。我的目标是在上面绘制图形的面板和下面带有常规按钮和标签的面板。

我已经完成了下面介绍的代码，但是我没有在先前绘制的矩形内绘制矩形。我相信我的问题是我正在调用一个类（矩形）来绘制扩展JPanel的矩形，这意味着每次我尝试绘制一个新的矩形时，都会创建一个不与前一个矩形重叠的新面板！

编辑

我抬头看一些例子，最后能想出一个代码来生成形状（矩形这种情况下），因为我需要他们在同一个面板上。我对代码做了一些更改，下面是新代码。

L.java

import java.awt.Color; 
import java.awt.Container; 
import javax.swing.JFrame; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

class L extends JFrame { 

public static final int ww = 1000; 
public static final int wh = 600; 
public static final String wt = "Teste"; 
Container pane = getContentPane(); 
DrawRectangle rectangle = new DrawRectangle(); 

public L() { 
    setSize(ww,wh); 
    this.setTitle(wt); 
    Sim(); 
    pane.add(rectangle); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setVisible(true); 
} 

public void addRectangle(int px, int py, int pwh, Color pc) { 
    this.rectangle.addRectangle(px, py, pwh, pc); 
} 

public void Sim() { 
    addRectangle(100,100,250,Color.red); 
    addRectangle(200,200,50,Color.green); 
} 

public static void main(String[] args) { 

    L l = new L(); 

    try { 
     UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); 
    } catch (UnsupportedLookAndFeelException ex) { 
     ex.printStackTrace(); 
    } catch (IllegalAccessException ex) { 
     ex.printStackTrace(); 
    } catch (InstantiationException ex) { 
     ex.printStackTrace(); 
    } catch (ClassNotFoundException ex) { 
     ex.printStackTrace(); 
    } 

    //} 

} 

} 

DrawRectangle.java

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.geom.Rectangle2D; 
import java.util.ArrayList; 
import javax.swing.JPanel; 

class DrawRectangle extends JPanel { 
private java.util.List<Rectangle2D> squares; 
private java.util.List<Color> colors; 
//private int a, startX, startY; 
public DrawRectangle(){ 
    squares = new ArrayList<Rectangle2D>(); 
    colors = new ArrayList<Color>(); 
} 

public void addRectangle(int px, int py, int pwh, Color pc) { // square 
    squares.add(new Rectangle2D.Double(px, py, pwh, pwh)) ; 
    colors.add(pc); 
    //this.a = a; 
    //this.startX = startX; 
    //this.startY = startY; 
} 
public void paintComponent(Graphics g) { 
    Graphics2D g1 = (Graphics2D) g; 
    for(Rectangle2D rect : squares) { 
     System.out.println(colors); 
     g1.setColor(colors); 
     g1.draw(rect); 
    } 
} 
} 

一个新的问题现在已经站起身！我做错了什么，我不能使用颜色我传递给方法来绘制不同颜色的形状？

Answer 1

嗯那也许是因为尝试创建一个JPanel，它接受的Rectangles，然后一个数组吸取那些过于面板像这样：

import java.awt.*; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 

public class RectangleDrawingTest extends JFrame { 

    public RectangleDrawingTest() { 
     createAndShowUI(); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       RectangleDrawingTest drawingTest = new RectangleDrawingTest(); 
      } 
     }); 
    } 

    private void createAndShowUI() { 
     setTitle("Rectangle Drawing Test"); 
     setSize(300, 300); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setResizable(false); 
     setLocationRelativeTo(null); 
     addComponentsToContentPane(this.getContentPane()); 
     setVisible(true); 
    } 

    private void addComponentsToContentPane(Container contentPane) { 

     Rectangle[] recs = new Rectangle[3]; 
     recs[0] = new Rectangle(100, 100, 150, 100); 
     recs[1] = new Rectangle(100, 100, 125, 75); 
     recs[2] = new Rectangle(100, 100, 100, 50); 

     MyPanel mr = new MyPanel(recs); 

     contentPane.add(mr); 
    } 
} 

class MyPanel extends JPanel { 

    private final Rectangle[] recs; 

    public MyPanel(Rectangle[] recs) { 
     this.recs = recs; 
    } 

    @Override 
    protected void paintComponent(Graphics grphcs) { 
     super.paintComponent(grphcs); 
     grphcs.setColor(Color.BLACK); 
     for (int i = 0; i < recs.length; i++) { 
      grphcs.drawRect(recs[i].x, recs[i].y, recs[i].width, recs[i].height); 
     } 
    } 
} 

附录：

因为你有两个squares和colorArrayList使用for循环这样一个递增的变量（正方形大小和颜色大小横向它们当然是相同的）：

Answer 2

创建自己的平板状

class MyPanel extends JPanel{ 
Rectangulo one; 

Rectangulo two; 
public MyPanel(){ 
    one = new Rect...etc.; 
    two = new Rect...etc.; 
} 

public paint(Graphics g){ 
    one.paint(g); 
    two.paint(g); 
    //two is overlapping one 
} 

，并添加到您的JFrame ...

编辑： ...或添加油漆（图形克）和重绘（）到您的JFrame，你重绘你PANEL1 ...

希望它可以帮助...