可以通过使用渐变(Gradient)类来实现。渐变是一种平滑过渡的效果,可以在图形中创建从一种颜色到另一种颜色的过渡效果。
Java提供了两种类型的渐变:线性渐变和径向渐变。
应用场景:线性渐变可以用于创建渐变背景、渐变文字等效果。
示例代码:
import java.awt.Color;
import java.awt.GradientPaint;
import import java.awt.Graphics;
import import java.awt.Graphics2D;
import import javax.swing.JFrame;
import import javax.swing.JPanel;
public class GradientExample extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
int x1 = 0;
int y1 = 0;
int x2 = getWidth();
int y2 = getHeight();
Color startColor = Color.RED;
Color endColor = Color.BLUE;
GradientPaint gradient = new GradientPaint(x1, y1, startColor, x2, y2, endColor);
g2d.setPaint(gradient);
g2d.fillRect(x1, y1, x2, y2);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Gradient Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new GradientExample());
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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应用场景:径向渐变可以用于创建光晕、光照等效果。
示例代码:
import java.awt.Color;
import java.awt.GradientPaint;
import import java.awt.Graphics;
import import java.awt.Graphics2D;
import import javax.swing.JFrame;
import import javax.swing.JPanel;
public class GradientExample extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
int centerX = getWidth() / 2;
int centerY = getHeight() / 2;
int startRadius = 0;
int endRadius = Math.min(getWidth(), getHeight()) / 2;
Color startColor = Color.RED;
Color endColor = Color.BLUE;
GradientPaint gradient = new GradientPaint(centerX, centerY, startColor, centerX, centerY, endColor);
g2d.setPaint(gradient);
g2d.fillOval(centerX - endRadius, centerY - endRadius, endRadius * 2, endRadius * 2);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Gradient Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new GradientExample());
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
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