java中的褪色

Question

我最近完成了路径查找可视化工具的工作。我想知道是否可以使用图形包使颜色从白色开始，然后逐渐变为各自的颜色，如青色或黑色。现在我把它放在颜色立即出现的地方，我会认为如果颜色能够相互褪色，它会看起来更好。这是我到目前为止的代码和输出的图片

路径查找可视化仪

public void paintComponent(Graphics g) {
super.paintComponent(g);
for (int x = 0; x < cells; x++) { //coloring each node
for (int y = 0; y < cells; y++) {
switch (map[x][y].getType()) {
case 0: //start node
g.setColor(Color.GREEN);
break;
case 1: //end node
g.setColor(Color.RED);
break;
case 2: //wall node
g.setColor(Color.BLACK);
break;
case 3: //empty node
g.setColor(Color.WHITE);
break;
case 4: //visited nodes
g.setColor(Color.CYAN);
break;
case 5: //path
g.setColor(Color.YELLOW);
break;
}
g.fillRect(x * CSIZE, y * CSIZE, CSIZE, CSIZE);
g.setColor(Color.BLACK); //grid color
g.drawRect(x * CSIZE, y * CSIZE, CSIZE, CSIZE);
}
}
}

Answer 1

这里有一种方法。它使用计时器来周期性地减少rgb配色方案中的红色分量。

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class ColorFadingDemo extends JPanel implements ActionListener {
Color color = new Color(255,0,0);
final static int height = 500;
final static int width = 500;
final static String title = "default title";
JFrame frame = new JFrame(title);
public static void main(String[] args) {
SwingUtilities.invokeLater(
() -> new ColorFadingDemo().start());
}
public void start() {
Timer timer = new Timer(0, this);
timer.setDelay(20);
timer.start();
}
public void actionPerformed(ActionEvent ae) {
int rgb = color.getRGB();
rgb -= 0x10000;
color = new Color(rgb);
repaint();
}
public ColorFadingDemo() {
frame.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE);
frame.add(this);
setPreferredSize(
new Dimension(width, height));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}

public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(color);
g2d.fillRect(100,100,300,300);
g2d.dispose();
}
}

Answer 2

简单：

int transparency = 0; // Transparency value;
int R = 255, G = 0, B = 0; //Enter your RGB values
Color c; // The color that you can then use in your paint method
Thread t = new Thread() {
public void run() {
while (transparency < 255) {
int transparency = 0;
c = new Color(R,G,B,transparency); // By creeting a custom color you can define the R, G, B and transparency values
transparency++;
try {
int fadeTime = 1000; // How long the fading process should go
Thread.sleep(255/fadeTime);
} catch (Exception e) {}
}
}
};
t.start(); // The thread will continue to run in the background until the transparency reaches 255