＆＃34;动画效果＆＃34;正弦波绘图

Question

所以我用Java制作了一个简单的正弦波。我只是想知道我怎么可能去做动画＆＃34;动画＆＃34;波形显示波形运动。

到目前为止，这是我的代码：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.Timer;

public class WavePane extends JPanel
{
    int width = Waves.WIDTH, height = Waves.HEIGHT;
    final int SPEED = 4; // 1000ms

    Timer timer;
    int phase;

    public WavePane() {
        phase = 0;
        timer = new Timer(SPEED, new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                phase++;
                repaint();

                if(phase >= 360) {
                    phase = 0;
                }
            }
        });
        timer.start();
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        g.drawLine(0, height / 2, width, height / 2);

        drawWave(g, width, height, phase);
    }

    private void drawWave(Graphics g, int width, int height, int phase) {
        for(double x = -(width / 2); x <= (width / 2); x = x + 0.5) {
            double y = 50 * Math.sin((x + phase) * (Math.PI / 180));

            int x1 = (int)x;
            int y1 = (int)y;

            g.setColor(Color.BLUE);

            g.drawLine((width / 2) + x1, (height / 2) - y1 - 1, (width / 2) + x1, (height / 2) - y1 - 1);
            g.drawLine((width / 2) + x1, (height / 2) - y1, (width / 2) + x1, (height / 2) - y1);
            g.drawLine((width / 2) + x1, (height / 2) - y1 + 1, (width / 2) + x1, (height / 2) - y1 + 1);
        }
    }
}

代码工作和动画也有效！但是我怎样才能使它更顺畅 ??

Answer 1

每次更新时都必须调用repaint()方法，以更新屏幕上呈现的内容。