java – 移动对象和计时器
我有一个500宽度和400高度的屏幕,我有一个带有一堆形状的矢量.假设矢量有两种不同的形状,例如.我希望从屏幕底部随机弹出的对象达到一定的上升然后再下降(类似于游戏水果忍者,其中水果是我的形状).
在我的主(视图)中,我有一个形状向量,我实例化定时器,添加到数组并使用translate函数将它们放在屏幕的底部.我的计时器接收一个动作监听器,它基本上改变了形状的转换,直到上升然后向下移动,但我的问题是所有的形状都是在同一时间开始的. 像这样的东西: Shape f = new Shape(new Area(new Ellipse2D.Double(0,50,50))); f.translate(0,400); f.timer = new Timer( 10,taskPerformer); f.timer.start(); vector.add(f); Shape f2 = new Shape(new Area(new Rectangle2D.Double(0,50))); f2.translate(200,400); f2.timer = new Timer( 10,taskPerformer); f2.timer.setInitialDelay(5000); f2.timer.start(); vector.add(f2); 和我的动作听众: Random generator = new Random(); ActionListener taskPerformer = new ActionListener() { public void actionPerformed(ActionEvent evt) { //...Perform a task... for (Shape s : model.getShapes()) { // Scale object using translate // once reached ascent drop down // translate to diffrenet part of the bottom of the screen // delay its timer } update(); //basically repaints } }; 我遇到的问题是所有形状都遵循相同的计时器,并开始同时弹出(没有延迟)…… 关于如何避免这种情况的建议,或者我应该尝试不同的方法 解决方法
请参阅下面的runnable示例.我所做的是将radomDelayedStart传递给Shape.计时器的每个滴答,randomDelayedStart减少直到它达到0,即当绘制的标志被提升时.大多数逻辑都在Shape类方法中,这些方法在Timers Actionlistener中调用.一切都在一个Timer中完成.对于上升,我只使用了硬编码50,但您也可以将随机上升传递给Shape.如果您有任何疑问,请告诉我.我试图让代码尽可能清晰. import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.List; import java.util.Random; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.Timer; public class RandomShape extends JPanel { private static final int D_HEIGHT = 500; private static final int D_WIDTH = 400; private static final int INCREMENT = 8; private List<Shape> shapes; private List<Color> colors; private Timer timer = null; public RandomShape() { colors = createColorList(); shapes = createShapeList(); timer = new Timer(30,new ActionListener() { public void actionPerformed(ActionEvent e) { for (Shape shape : shapes) { shape.move(); shape.decreaseDelay(); repaint(); } } }); JButton start = new JButton("Start"); start.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { timer.start(); } }); JButton reset = new JButton("Reset"); reset.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { shapes = createShapeList(); timer.restart(); } }); JPanel panel = new JPanel(); panel.add(start); panel.add(reset); setLayout(new BorderLayout()); add(panel,BorderLayout.PAGE_START); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); for (Shape shape : shapes) { shape.drawShape(g); } } @Override public Dimension getPreferredSize() { return new Dimension(D_WIDTH,D_HEIGHT); } private List<Color> createColorList() { List<Color> list = new ArrayList<>(); list.add(Color.BLUE); list.add(Color.GREEN); list.add(Color.ORANGE); list.add(Color.MAGENTA); list.add(Color.CYAN); list.add(Color.PINK); return list; } private List<Shape> createShapeList() { List<Shape> list = new ArrayList<>(); Random random = new Random(); for (int i = 0; i < 20; i++) { int randXLoc = random.nextInt(D_WIDTH); int randomDelayedStart = random.nextInt(100); int colorIndex = random.nextInt(colors.size()); Color color = colors.get(colorIndex); list.add(new Shape(randXLoc,randomDelayedStart,color)); } return list; } class Shape { int randXLoc; int y = D_HEIGHT; int randomDelayedStart; boolean draw = false; boolean down = false; Color color; public Shape(int randXLoc,int randomDelayedStart,Color color) { this.randXLoc = randXLoc; this.randomDelayedStart = randomDelayedStart; this.color = color; } public void drawShape(Graphics g) { if (draw) { g.setColor(color); g.fillOval(randXLoc,y,30,30); } } public void move() { if (draw) { if (y <= 50) { down = true; } if (down) { y += INCREMENT; } else { y -= INCREMENT; } } } public void decreaseDelay() { if (randomDelayedStart <= 0) { draw = true; } else { randomDelayedStart -= 1; } } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JFrame frame = new JFrame(); frame.add(new RandomShape()); frame.pack(); frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |