如何将drawPolygon()添加到按钮侦听器?

时间:2013-11-15 11:49:27

标签: java eclipse button event-handling

我正在尝试对事件监听器进行练习。要绘制三角形,我使用drawPolygon方法,但我不知道如何将它添加到buttonListener以执行actionListener。 这是代码的一部分:

public class Triangle extends Figure {
            int x[];
            int y[];
            int n;

            Triangle(boolean f, Color c, int x, int y, int n) {
                super(f, c, x, y);
                int xPoints[];
                int yPoints[];
                int nPoints[];
            }

            @Override
            public void drawMySelf(Graphics g) {

                int xPoints[] = {80, 150, 80};
                int yPoints[] = {80, 150, 150};
                int nPoints = 3;

                Polygon P = new Polygon(x, y, n);
                if (filled)
                    g.fillPolygon(P);
                else g.drawPolygon(P);

            }
        }
@Override
            public void actionPerformed(ActionEvent e) {


                String kommando = e.getActionCommand();

                int width = drawPanel.getWidth();
                int heigth = drawPanel.getHeight();


                if (kommando.equals("Cercle")) {

                    theFigures.add(new Circle(false, Color.BLUE, 20, 20, 50));

                 } else if (kommando.equals("Rektangle")) {
                    theFigures.add(new Rectangle(false, Color.BLACK, 300, 100,
                            150, 100));
                 } else if (kommando.equals("Triangele")) {
                    theFigures.add(___my problem is here___); 
                 }  else if (kommando.equals("Cercle rempli")) {
                     theFigures.add(new Circle(true, Color.YELLOW, 50, 100, 100));
                 }  else if (kommando.equals("Rektangle rempli")) {
                     theFigures.add(new Rectangle(true, Color.GREEN, 500, 50,
                                100, 250));


 }

1 个答案:

答案 0 :(得分:0)

首先,您必须创建一些按钮(用于圆形,矩形等),并通过setActionCommand方法配置它们。然后使用button.addActionListener将actionListener添加到它。我认为this文章会对你有帮助。