绘制矩形边框粗细

是否可以轻松地绘制具有给定边框粗细的矩形？

Answer 1

如果要绘制Graphics2D对象，可以使用setStroke()方法：

 Graphics2D g2; double thickness = 2; Stroke oldStroke = g2.getStroke(); g2.setStroke(new BasicStroke(thickness)); g2.drawRect(x, y, width, height); g2.setStroke(oldStroke); 

如果这是在Swing组件上完成并且您正在传递Graphics对象，则可以将其向下转换为Graphics2D 。

 Graphics2D g2 = (Graphics2D) g; 

Answer 2

以下是如何执行此操作：带有彩色线条的边框，厚度为5。

 Border linebor = BorderFactory.createLineBorder(new Color(0xAD85FF), 5); 

Answer 3

 **Tested code with buffered image with different thickness values**: Graphics2D g = bufferedImage.createGraphics(); int height = //image height int width = //image height int borderWidth = //border thickness int borderControl = 1; //set border color g.setColor(Color.BLACK); //set border thickness g.setStroke(new BasicStroke(borderWidth)); //to fix issue for even numbers if(borderWidth%2 == 0){ borderControl = 0; } g.drawLine(0, 0, 0, height); g.drawLine(0, 0, width, 0); g.drawLine(0, height – borderControl, width, height – borderControl); g.drawLine(width – borderControl, height – borderControl, width – borderControl, 0);