java 基于双精度的Java Draw Line（亚像素精度）
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Java Draw Line based on doubles (sub-pixel precision)
提问by Adrian D'Urso
I am making a basic Java program and I would like to draw a line using basic swing Graphics.drawLine.
我正在制作一个基本的 Java 程序，我想使用基本的 Swing Graphics.drawLine画一条线。
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?
有没有办法在双打方面获得这两分，以便我可以使输出更准确，或者另一种更好的方法？
回答by aioobe
You can draw the lines using ((Graphics2D) g).draw(Shape)and pass it a Line2D.Double.
您可以使用绘制线条((Graphics2D) g).draw(Shape)并将其传递给Line2D.Double.
Here's a demo:
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);
}
}
You might also want to try adding
您可能还想尝试添加
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL,
RenderingHints.VALUE_STROKE_PURE)
回答by ring bearer
If you have a refernce to g, which I assume is Graphicsobject, you should use Java 2D APIs
如果你有一个引用g，我假设它是Graphics对象，你应该使用 Java 2D APIs
Graphics2D g2 = (Graphics2D) g;
g2.draw(new Line2D.Double(x1, y1, x2, y2));
Javadocs for:
Javadocs：
