java中循环和非循环梯度的区别

Question

我目前正在学习Java GUI开发，在这里我坚持使用Gradient。 我想知道Cyclic和Acyclic Gradient之间的差异吗？

Answer 1

• 循环渐变

可以简单地将其作为模式重复放在渐变区域上。

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• 非循环渐变

模式不会重复自身，而是随着渐变区域变宽。

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
class GradientPane extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2D = (Graphics2D) g;
    Point2D.Float p1 = new Point2D.Float(150.f, 75.f); // Gradient line start
    Point2D.Float p2 = new Point2D.Float(250.f, 75.f); // Gradient line end
    float width = 300;
    float height = 50;
    GradientPaint g1 = new GradientPaint(p1, Color.WHITE, p2, Color.DARK_GRAY, true); // Cyclic
                                                                                      // gradient
    Rectangle2D.Float rect1 = new Rectangle2D.Float(p1.x - 100, p1.y - 25, width, height);
    g2D.setPaint(g1); // Gradient color fill
    g2D.fill(rect1); // Fill the rectangle
    g2D.setPaint(Color.BLACK); // Outline in black
    g2D.draw(rect1); // Fill the rectangle
    g2D.draw(new Line2D.Float(p1, p2));
  }
}
public class CyclicGradientPaint {
  public static void main(String[] a) {
    JFrame window = new JFrame("Cyclic Gradient Paint");
    window.setBounds(30, 30, 300, 300);
    window.getContentPane().add(new GradientPane());
    window.setVisible(true);
  }
}