Java 为什么赢了'；我的形状不是在JFrame上画的吗？

我正试图根据用户点击的内容绘制一个特定的形状。程序中的所有其他方法都运行良好。 以下是当前显示内容的图片：

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

在这里，所选内容用于决定要绘制的内容。它通过将参数传递给drawShape类的方法来工作；如下图所示

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

这是drawShapes课程

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

  import java.awt.*;
    import javax.swing.*;
    public class DrawShapes extends JPanel {
        private int x,y;
        private boolean ovals,rects;
        public void paintComponent(Graphics g){
            super.paintComponent(g);
            if(ovals==false&&rects==true){
            g.setColor(Color.BLUE);
            g.fillRect(x,y,15,15);}
            else if(ovals==true&&rects==false){
                g.setColor(Color.BLUE);
                g.fillOval(x, y, 30, 15);
            }
            else{

            }
        }
        public void setPosition(int newX, int newY) {
            this.x = newX;
            this.y = newY;
            repaint();
        }

            public void whatToDraw(boolean newrects, boolean newovals){
                this.ovals=newovals;
                this.rects=newrects;
                repaint();


        }
    }

---

我猜问题在于您没有覆盖DrawShapes类的

getPreferredSize（）

方法，因此没有任何东西可以绘制。因此，您需要覆盖

getPreferredSize（）

以返回形状的实际大小，在您的情况下，对于椭圆和（x+15，y+15）矩形，该形状看起来是（x+30，y+15）

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

您真的应该为矩形和椭圆形创建单独的类。使用if/else语句不是一个好的设计，如果您决定添加一个“三角形”形状，因为您的逻辑变得更加复杂，那么使用if/else语句也不是很灵活

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

但是，即使这样做，您也不会得到您期望的结果，因为我猜您将DrawShapes组件添加到面板中，默认情况下，该面板使用FlowLayout。因此，您的形状将仅显示在面板上的一行中，而不是单击面板的位置

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

如果希望零部件显示在单击的位置，则需要将椭圆形零部件的大小设置为（30，15），并将零部件的位置设置为（x，y）。然后在（0，0）处完成形状的绘制，因此绘制是相对于组件的，而不是相对于面板的。然后，需要将面板的布局设置为null，以便可以根据每个形状的位置手动定位每个形状

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

另一个选项是不使用真实组件，而只是将形状绘制到面板上。查看两种常见的增量绘制方法的示例。它显示了两种不同的方法，具体取决于您的具体需求

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

---

示例显示了如何添加矩形，以及如何单击/拖动鼠标。因此，您需要修改代码以支持不同类型的形状。

我猜问题在于您没有覆盖DrawShapes类的

getPreferredSize（）

方法，因此没有任何可绘制的内容。因此，您需要覆盖

getPreferredSize（）

以返回形状的实际大小，在您的情况下，对于椭圆和（x+15，y+15）矩形，该形状看起来是（x+30，y+15）

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

您真的应该为矩形和椭圆形创建单独的类。使用if/else语句不是一个好的设计，如果您决定添加一个“三角形”形状，因为您的逻辑变得更加复杂，那么使用if/else语句也不是很灵活

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

但是，即使这样做，您也不会得到您期望的结果，因为我猜您将DrawShapes组件添加到面板中，默认情况下，该面板使用FlowLayout。因此，您的形状将仅显示在面板上的一行中，而不是单击面板的位置

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

如果希望零部件显示在单击的位置，则需要将椭圆形零部件的大小设置为（30，15），并将零部件的位置设置为（x，y）。然后在（0，0）处完成形状的绘制，因此绘制是相对于组件的，而不是相对于面板的。然后，需要将面板的布局设置为null，以便可以根据每个形状的位置手动定位每个形状

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

另一个选项是不使用真实组件，而只是将形状绘制到面板上。查看两种常见的增量绘制方法的示例。它显示了两种不同的方法，具体取决于您的具体需求

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }

---

示例显示了如何添加矩形，以及如何单击/拖动鼠标。因此，您需要修改代码以支持不同类型的形状。

首先，我必须创建drawShapes类的一个实例，如另一个用户所述。然后另一部分是我搞乱了逻辑，你应该只有在ableToDraw==false时才能画图，这意味着没有选中“not About to draw”按钮。对我来说，这是个糟糕的名字。完成后，代码工作正常。

首先，我必须创建drawShapes类的一个实例，如另一个用户所述。然后另一部分是我搞乱了逻辑，你应该只有在ableToDraw==false时才能画图，这意味着没有选中“not About to draw”按钮。对我来说，这是个糟糕的名字。一旦完成，代码就可以正常工作。

您继续创建

DrawShapes

的新实例，其中一些您没有添加到UI中，那些您添加的显示当前内容，这将导致一团混乱。最好创建一个

DrawShapes

的实例并添加它，然后更改它的属性这解决了一半的问题，另一部分是我弄乱了逻辑，你应该只能在ableToDraw==false时进行绘制，这意味着没有选择“无法绘制”的按钮。这对我来说是一个糟糕的命名。你继续创建

DrawShapes

的新实例，有些你没有添加到UI中，有些你添加的显示当前内容，这将导致一团混乱。最好创建一个

DrawShapes

的实例并添加它，然后更改它的属性这解决了一半的问题，另一部分是我弄乱了逻辑，你应该只能在ableToDraw==false时进行绘制，这意味着没有选择“无法绘制”的按钮。对我来说，这是个糟糕的名字。

if(ableToDraw==true){
                if(rect.isSelected()&&oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                        }
                    }
                else if(rect.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(true, false);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);

                }
                else if(oval.isSelected()){
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false, true);
                    shapes.setPosition(event.getX(), event.getY());
                    add(shapes);
                }
                else{
                    DrawShapes shapes = new DrawShapes();
                    shapes.whatToDraw(false,false);
                }
            }
            @Override
            public void mousePressed(MouseEvent event){
                statusbar.setText("You pressed down the mouse");
            }

            @Override
            public void mouseReleased(MouseEvent event){
                statusbar.setText("You released the button");
            }
            @Override
            public void mouseEntered(MouseEvent event){
                statusbar.setText("You entered the area");

            }
            @Override
            public void mouseExited(MouseEvent event){
                statusbar.setText("The mouse has left the window");

            }
            //These are mouse motion events
            @Override
            public void mouseDragged(MouseEvent event){
                statusbar.setText("You are dragging the mouse");
            }
            @Override
            public void mouseMoved(MouseEvent event){
                statusbar.setText("You are moving the mouse");
            }
            @Override
            public void itemStateChanged(ItemEvent event){
                if(cb.isSelected()){
                    changeColor=false;
                }
                else{
                    changeColor=true;
                }
                if(drawBox.isSelected()){
                    ableToDraw=false;
                }
                else{
                    ableToDraw=true;
                }
            }

        }
    }