我正在尝试绘制月球的图形描绘。
为此，我首先绘制一个JPanel黑色，然后画一个Image来描绘它上面的月亮。
一切都很好，直到这里。
接下来，在顶部绘制第二个Image（一个蒙版）以模拟地球的阴影以获得不同的阶段。
但是，有时面具会被涂上，但有时它不会被涂上，导致满月显示不正确。 这种情况完全是随机发生的！ left clicking mask-01.png，{I} {}} mask-06.png，mask-12.png，mask-17.png Right click
每个import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.AffineTransform;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class App {
int moonAgeDays = 0;
float LUNAR_CYCLE_DAYS = 29.5306f;
JFrame frame;
MoonImage moonImage;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
App window = new App();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
App() {
frame = new JFrame("Moon Draw");
frame.setLocationByPlatform(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
moonImage = new MoonImage();
moonImage.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent mouseEvent) {
moonAgeDays += mouseEvent.getButton() == MouseEvent.BUTTON1 ? 1 : -1;
if (moonAgeDays < 0)
moonAgeDays = (int) LUNAR_CYCLE_DAYS;
else if (moonAgeDays > LUNAR_CYCLE_DAYS)
moonAgeDays = 0;
updateMask();
}
});
frame.getContentPane().add(moonImage);
updateMask();
frame.pack();
}
void updateMask() {
int phase = (int) Math.toDegrees(Math.acos(-Math.cos(moonAgeDays
/ LUNAR_CYCLE_DAYS * 2 * Math.PI)));
moonImage.update(phase, moonAgeDays > LUNAR_CYCLE_DAYS / 2 ? 180 : 0);
}
}
class MoonImage extends JPanel {
private int phaseAngle = 0;
private int rotateBy = 0;
private static final long serialVersionUID = 1L;
private final int MOON_PADDING = 10;
private final int MOON_SIZE = 130;
private final Image IMAGE_MOON = Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/moon.png"));
private final Image IMAGE_MASK[] = {Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-01.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-02.png")) ,
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-03.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-04.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-05.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-06.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-07.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-08.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-09.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-10.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-11.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-12.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-13.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-14.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-15.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-16.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-17.png")),
Toolkit.getDefaultToolkit().createImage(MoonImage.class.getResource("/resources/mask-18.png"))};
MoonImage() {
this.setPreferredSize(new Dimension(MOON_SIZE + MOON_PADDING * 2, MOON_SIZE + MOON_PADDING * 2));
}
/** Update MoonImage with a Mask and Angle to rotate Mask by*/
public void update(int phaseAngle, int rotateBy) {
this.phaseAngle = phaseAngle;
this.rotateBy = rotateBy;
repaint();
}
@Override
public void paintComponent(Graphics graphic) {
super.paintComponent(graphic);
boolean resultMaskDraw = false;
Graphics2D graphics2d = (Graphics2D) graphic;
graphics2d.setColor(Color.BLACK);
graphics2d.fillRect(0, 0, MOON_SIZE + MOON_PADDING * 2, MOON_SIZE + MOON_PADDING * 2);
graphics2d.drawImage(IMAGE_MOON, MOON_PADDING, MOON_PADDING, this);
int phaseBy10 = Math.round(phaseAngle / 10);
if (phaseBy10 != 0) {
if (rotateBy != 0) {
AffineTransform at = new AffineTransform();
at.translate(MOON_SIZE / 2 + MOON_PADDING, MOON_SIZE / 2 + MOON_PADDING);
at.rotate(Math.toRadians(rotateBy));
at.translate(-MOON_SIZE / 2, -MOON_SIZE / 2);
resultMaskDraw = graphics2d.drawImage(IMAGE_MASK[phaseBy10 - 1], at, this);
} else
resultMaskDraw = graphics2d.drawImage(IMAGE_MASK[phaseBy10 - 1], MOON_PADDING, MOON_PADDING, this);
}
String maskInfo = phaseBy10 == 0 ? "No mask" : String.format("mask-%02d.png", phaseBy10);
graphics2d.setColor(phaseBy10 == 0 || resultMaskDraw ? Color.BLUE : Color.RED);
graphics2d.drawString((phaseBy10 == 0 || resultMaskDraw ? "Drew: " : "Failed: ")
+ maskInfo, 5, MOON_SIZE + MOON_PADDING * 2 - 5);
}
}
后具有各个帧的GIF：
https://drive.google.com/file/d/0B0lWxG68xR4mTlFYYU81N1kzaVE/view?usp=sharing
我做错了什么？
代码：
drawImage()我在Linux（Kubuntu with OpenJDK）和Windows 7中尝试了这个。两者都有同样的问题...
注意：
select top 10 CONVERT(nvarchar(2000),SUBSTRING(COL1,3, LEN(ISNULL(len(COL1),10)-2)),1)
from TBL
几乎所有图像都出现故障;你会看到信息文字先用红色涂成蓝色！答案 0 :(得分：0)
想通了！
在线118，它应该是：
resultMaskDraw = graphics2d.drawImage(IMAGE_MASK[phaseBy10 - 1], at, this);
而不是
resultMaskDraw = graphics2d.drawImage(IMAGE_MASK[phaseBy10 - 1], at, null);
但真的很奇怪，因为平局只在某些时候失败而且并非总是如此！