I'm trying to draw a polygon with a stroke of 1 pixel. Because the entire polygon is scaled by 100, I set the line width to 0.01. For some reason though, the polygon gets drawn with an on-screen line width of what looks to be 100 pixels instead of 1.
我尝试画一个有1个像素点的多边形。因为整个多边形的比例是100,所以我将线宽设为0。01。由于某些原因,这个多边形在屏幕上的线宽看起来是100像素而不是1。
I'm using GeneralPath
as the polygon shape. Thin lines do get drawn if I use the same approach for drawing Line2D
shapes.
我用一般路径作为多边形形状。如果我使用相同的方法来绘制线2d形状,会得到细线。
g2d.scale(100, 100);
g2d.setStroke(new BasicStroke(0.01f));
g2d.draw(theShape);
New info: If I remove the setStroke line I correctly get a 2 pixel line, since a BasicStroke of 0.02f was set on the Graphics2D object earlier.
新信息:如果我删除了setStroke line,我就会得到一个2像素的线条,因为之前在Graphics2D对象上设置了0.02f的BasicStroke。
This is the real setStroke line
这是真正的setStroke行
g.setStroke(new BasicStroke((float) (1f / getRoot().scaleX)));
3 个解决方案
#1
3
The following code produces the output show below. You must have an error elsewhere in your code. Perhaps another call to scale
that you have omitted in your question:
下面的代码生成下面的输出。在代码的其他地方一定有错误。也许你在你的问题中忽略了另一个关于规模的问题:
import java.awt.*;
public class FrameTest {
public static void main(String[] args) throws InterruptedException {
JFrame f = new JFrame("Demo");
f.getContentPane().setLayout(new BorderLayout());
f.add(new JComponent() {
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
GeneralPath theShape = new GeneralPath();
theShape.moveTo(0, 0);
theShape.lineTo(2, 1);
theShape.lineTo(1, 0);
theShape.closePath();
g2d.scale(100, 100);
g2d.setStroke(new BasicStroke(0.01f));
g2d.draw(theShape);
}
});
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
f.setVisible(true);
}
}
#2
1
I don't know why, but it works now.
我不知道为什么,但它现在起作用了。
#3
0
This also set 1px width for lines:
这也为线条设置了1px的宽度:
graphics2D.setStroke(new BasicStroke(0));
#1
3
The following code produces the output show below. You must have an error elsewhere in your code. Perhaps another call to scale
that you have omitted in your question:
下面的代码生成下面的输出。在代码的其他地方一定有错误。也许你在你的问题中忽略了另一个关于规模的问题:
import java.awt.*;
public class FrameTest {
public static void main(String[] args) throws InterruptedException {
JFrame f = new JFrame("Demo");
f.getContentPane().setLayout(new BorderLayout());
f.add(new JComponent() {
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
GeneralPath theShape = new GeneralPath();
theShape.moveTo(0, 0);
theShape.lineTo(2, 1);
theShape.lineTo(1, 0);
theShape.closePath();
g2d.scale(100, 100);
g2d.setStroke(new BasicStroke(0.01f));
g2d.draw(theShape);
}
});
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
f.setVisible(true);
}
}
#2
1
I don't know why, but it works now.
我不知道为什么,但它现在起作用了。
#3
0
This also set 1px width for lines:
这也为线条设置了1px的宽度:
graphics2D.setStroke(new BasicStroke(0));