这是我的整个程序。问题出在滚珠方法中，让红点/球在y轴上直线向下移动到达内部蓝色圆圈以获得“涟漪效应”错觉。请帮我这样做。我改变了球沿x轴移动的代码，它只需要垂直移动。提前感谢您的帮助。
import java.awt.Color; import java.awt.Graphics;
public class Animation {
public static void main(String [] args) {
DrawingPanel panel = new DrawingPanel(350, 350);
Graphics g = panel.getGraphics();
background(g);
ballroll(panel, g);
drawCircles(g);
sunrayspotlight(g);
}
public static void background(Graphics g) {
g.setColor(Color.BLUE);
g.fillRect(0, 175, 350, 175);
g.setColor(Color.ORANGE);
g.fillRect(0, 0, 350, 175);
}
public static void sunrayspotlight(Graphics g) {
int radius = 5;
int x = 0;
while(x <= 100) {
g.setColor(Color.YELLOW);
g.fillOval(0, 0, radius, radius);
try {
Thread.sleep(5);
} catch (InterruptedException e) {
}
x++;
radius = radius + 5;
}
}
public static void drawCircles(Graphics g) {
int radius = 5;
int x = 0;
while(x <= 25) {
g.setColor(Color.CYAN);
int z = radius / 2;
g.drawOval(245 - z, 245 - z, radius, radius);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
x++;
radius = radius + 5;
}
}
private static void ballroll(DrawingPanel panel, Graphics g) {
//draw and roll the ball now
g.setColor(Color.RED);
int x = 115, y = 110, direction=1;
while(y<175){
g.fillOval(235, 0, 20, 20);
if (x==0){
y+=60;
direction *= -1;
}
else if (x < 115){
direction *= -1;
y+=60;
}
y+=direction*15;
System.out.println(x);
panel.sleep(80);
}
panel.sleep(800);
}
}