我的问题是我想在面板上画一条虚线,我能够做到,但是它也用虚线画我的边框,这是我的天哪!
有人可以解释为什么吗?我正在使用paintComponent绘制并直接绘制到面板
这是绘制虚线的代码:
public void drawDashedLine(Graphics g, int x1, int y1, int x2, int y2){
Graphics2D g2d = (Graphics2D) g;
//float dash[] = {10.0f};
Stroke dashed = new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 0);
g2d.setStroke(dashed);
g2d.drawLine(x1, y1, x2, y2);
}
您正在修改Graphics
传入的实例paintComponent()
,该实例也用于绘制边框。
相反,请复制Graphics
实例并使用该副本进行绘制:
public void drawDashedLine(Graphics g, int x1, int y1, int x2, int y2){
//creates a copy of the Graphics instance
Graphics2D g2d = (Graphics2D) g.create();
//set the stroke of the copy, not the original
Stroke dashed = new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 0);
g2d.setStroke(dashed);
g2d.drawLine(x1, y1, x2, y2);
//gets rid of the copy
g2d.dispose();
}
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我来说两句