事实证明，我的问题并没有那么可怕，我在问题中给出的两个想法实际上是同一个想法。下面是一个类，它通过转换 .TransformedStrokeStrokeShape
import java.awt.*;
import java.awt.geom.*;
/**
* A implementation of {@link Stroke} which transforms another Stroke
* with an {@link AffineTransform} before stroking with it.
*
* This class is immutable as long as the underlying stroke is
* immutable.
*/
public class TransformedStroke
implements Stroke
{
/**
* To make this serializable without problems.
*/
private static final long serialVersionUID = 1;
/**
* the AffineTransform used to transform the shape before stroking.
*/
private AffineTransform transform;
/**
* The inverse of {@link #transform}, used to transform
* back after stroking.
*/
private AffineTransform inverse;
/**
* Our base stroke.
*/
private Stroke stroke;
/**
* Creates a TransformedStroke based on another Stroke
* and an AffineTransform.
*/
public TransformedStroke(Stroke base, AffineTransform at)
throws NoninvertibleTransformException
{
this.transform = new AffineTransform(at);
this.inverse = transform.createInverse();
this.stroke = base;
}
/**
* Strokes the given Shape with this stroke, creating an outline.
*
* This outline is distorted by our AffineTransform relative to the
* outline which would be given by the base stroke, but only in terms
* of scaling (i.e. thickness of the lines), as translation and rotation
* are undone after the stroking.
*/
public Shape createStrokedShape(Shape s) {
Shape sTrans = transform.createTransformedShape(s);
Shape sTransStroked = stroke.createStrokedShape(sTrans);
Shape sStroked = inverse.createTransformedShape(sTransStroked);
return sStroked;
}
}
我使用它的绘画方法看起来像这样：
public void paintComponent(Graphics context) {
super.paintComponent(context);
Graphics2D g = (Graphics2D)context.create();
int height = getHeight();
int width = getWidth();
g.scale(width/4.0, height/7.0);
try {
g.setStroke(new TransformedStroke(new BasicStroke(2f),
g.getTransform()));
}
catch(NoninvertibleTransformException ex) {
// should not occur if width and height > 0
ex.printStackTrace();
}
g.setColor(Color.BLACK);
g.draw(new Rectangle( 1, 2, 2, 4));
}
然后我的窗口看起来像这样：
我对此很满意，但如果有人有更多的想法，请随时回答。
注意力：这是返回 g 相对于设备空间的完整变换，而不仅仅是在 之后应用的变换。因此，如果有人在将图形提供给我的组件之前进行了一些缩放，这仍然会以2个设备像素宽度的笔划绘制，而不是为我的方法提供的grapic的2个像素。如果这是一个问题，请像这样使用它：g.getTransform().create()
public void paintComponent(Graphics context) {
super.paintComponent(context);
Graphics2D g = (Graphics2D)context.create();
AffineTransform trans = new AffineTransform();
int height = getHeight();
int width = getWidth();
trans.scale(width/4.0, height/7.0);
g.transform(trans);
try {
g.setStroke(new TransformedStroke(new BasicStroke(2f),
trans));
}
catch(NoninvertibleTransformException ex) {
// should not occur if width and height > 0
ex.printStackTrace();
}
g.setColor(Color.BLACK);
g.draw(new Rectangle( 1, 2, 2, 4));
}
在 Swing 中，通常您提供给 的图形仅被平移（因此 （0，0） 是组件的左上角），未缩放，因此没有区别。paintComponent
