基于双精度（子像素精度）的Java绘制线 [英] Java Draw Line based on doubles (sub-pixel precision)

问题描述

我正在制作一个基本的Java程序，我想使用基本的swing Graphics.drawLine 。

I am making a basic Java program and I would like to draw a line using basic swing Graphics.drawLine.

有没有办法根据双打来得出两点，这样我可以使输出更准确，或者更好的另一种方式？

Is there a way to make the two points in terms of doubles so I can make the output more accurate, or another way that is better?

推荐答案

您可以使用（（Graphics2D）g）.draw（Shape）绘制线条并传递 Line2D.Double 。

You can draw the lines using ((Graphics2D) g).draw(Shape) and pass it a Line2D.Double.

这是一个演示：

import javax.swing.*;

public class FrameTestBase extends JFrame {

    public static void main(String args[]) {
        FrameTestBase t = new FrameTestBase();
        t.add(new JComponent() {
            public void paintComponent(Graphics g) {
                Graphics2D g2 = (Graphics2D) g;
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                                    RenderingHints.VALUE_ANTIALIAS_ON);
                for (int i = 0; i < 50; i++) {
                    double delta = i / 10.0;
                    double y = 5 + 5*i;
                    Shape l = new Line2D.Double(5, y, 200, y + delta);
                    g2.draw(l);
                }
            }
        });

        t.setDefaultCloseOperation(EXIT_ON_CLOSE);
        t.setSize(400, 400);
        t.setVisible(true);
    }
}

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