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[英]I have to draw a smiley face and make its left eye blink using Graphics and Timer, but it doesn't blink
[英]How to move this eye applet or to make it blink?
请帮助我如何使用重新绘制,线程和可运行的工具使眼睛动起来或使其眨眼。 我不知道在哪里放置正确的代码以使其正常工作。 请帮助我! 谢谢! 这是代码:
import java.awt.*;
import java.applet.*;
public class Pucca extends Applet {
public Pucca(){
setSize(700, 700); }
//paint method
public void paint(Graphics g){
Color white = new Color(255,255,255);
g.setColor(white);
g.fillOval(600, 100, 125, 125); //left white fill eye
g.setColor(Color.BLACK);
g.drawOval(600, 100, 125, 125); // left big black line eye
g.setColor(white);
g.fillOval(700, 100, 125, 125); //right white fill eye
g.setColor(Color.BLACK);
g.drawOval(700, 100, 125, 125); //right big black line eye
Color blue = new Color(0, 160, 198);
g.setColor(blue);
g.fillOval(635, 130, 51, 51); // left blue fill eye
g.setColor(Color.BLACK);
g.drawOval(635, 130, 50, 50); // left black small line eye
g.setColor(blue);
g.fillOval(735, 130, 51, 51); // right blue fill eye
g.setColor(Color.BLACK);
g.drawOval(735, 130, 50, 50); // right black small line eye
g.setColor(Color.BLACK);
g.fillOval(650, 145, 20, 20); // left black iris
g.setColor(Color.BLACK);
g.fillOval(750, 145, 20, 20); // right black iris
}
}
说到动画,一切都会变。 您还会有很多重复的代码(严重的是,如果您可以画一只眼睛,则可以画很多)。
您需要做的第一件事是使眼睛的所有值尽可能可变。
跟随使眼睛大小和位置可变,虹膜和瞳孔成为眼睛大小的缩放值,这使整个过程更易于动画制作。
接下来,您需要一个更新的循环,该循环可以更新您要更改的值的状态。 为简单起见,我对其进行了设置,以使瞳孔具有可变的偏移量,该偏移量会随着时间而变化。
import java.applet.Applet;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
public class Pucca extends Applet {
public Pucca() {
setSize(700, 700);
Thread t = new Thread(new Runnable() {
private int xDelta = -1;
private int yDelta = 0;
private int blinkCount = 0;
@Override
public void run() {
while (true) {
try {
Thread.sleep(40);
} catch (InterruptedException ex) {
}
xOffset += xDelta;
double irisSize = eyeSize.width * irisScale;
double range = ((eyeSize.width - irisSize) / 2);
if (xOffset <= -range) {
xOffset = -(int) range;
xDelta *= -1;
} else if (xOffset >= range) {
xOffset = (int) range;
xDelta *= -1;
}
blinkCount++;
if (blink && blinkCount > 10) {
blink = false;
blinkCount = 0;
} else if (blinkCount > 25) {
blink = true;
blinkCount = 0;
}
repaint();
}
}
});
t.setDaemon(true);
t.start();
}
private boolean blink = false;
private int xOffset, yOffset = 0;
private Dimension eyeSize = new Dimension(125, 125);
private Point left = new Point(20, 20);
private Point right = new Point(left.x + 100, left.y);
private double irisScale = 0.4;
private double pupilScale = 0.16;
//paint method
@Override
public void paint(Graphics g) {
super.paint(g);
paintEye(g, new Rectangle(left, eyeSize));
paintEye(g, new Rectangle(right, eyeSize));
}
protected void paintEye(Graphics g, Rectangle bounds) {
Color white = new Color(255, 255, 255);
if (blink) {
g.setColor(Color.YELLOW);
} else {
g.setColor(white);
}
g.fillOval(bounds.x, bounds.y, bounds.width, bounds.height); //left white fill eye
g.setColor(Color.BLACK);
g.drawOval(bounds.x, bounds.y, bounds.width, bounds.height); // left big black line eye
if (!blink) {
Color blue = new Color(0, 160, 198);
paintEyePartAt(g, bounds, irisScale, blue);
paintEyePartAt(g, bounds, pupilScale, Color.BLACK);
}
}
private void paintEyePartAt(Graphics g, Rectangle bounds, double delta, Color color) {
int width = (int) (bounds.width * delta);
int height = (int) (bounds.height * delta);
g.setColor(color);
g.fillOval(
xOffset + bounds.x + ((bounds.width - width) / 2),
yOffset + bounds.y + ((bounds.height - height) / 2),
width, height); // left blue fill eye
g.setColor(Color.BLACK);
g.drawOval(
xOffset + bounds.x + ((bounds.width - width) / 2),
yOffset + bounds.y + ((bounds.height - height) / 2),
width,
height); // left blue fill eye
}
}
这使事情变得复杂,因为绘画可能会由于多种原因发生,其中许多原因您无法控制或将要通知,因此您在更改值的位置和时间时应格外小心。
您还应该查看不赞成使用的Java插件支持和转向无插件Web的知识,以及CS老师为什么应该停止教授Java applet的原因 。
Applet只是一项过时的技术,鉴于使用它们所固有的复杂性,您应该将注意力集中在基于窗口的程序上。
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