在Java中创建坡度

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);
  }
}

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);
  }
}