如何在Java Swing中创建圆角BevelBorder？

Question

我想使用斜面边框，因为它有点3D但我不知道如何创建圆角BevelBorder。

SoftBevelBorder不起作用，因为圆角半径太小。 如何使角落更圆？

Answer 1

这里有一个圆角边框示例，您可以在其中调整半径：

http://java-swing-tips.blogspot.co.at/2012/03/rounded-border-for-jtextfield.html

不是斜角，但你可以看到如何在SoftBevelBorder的源代码中实现“斜面”。 如果你设法做到这一点，我会对代码感兴趣:)

Answer 2

为了获得正确的边框形状，您需要覆盖AbstractBorder.paintBorder(...)方法。 执行此操作时，可以向该方法添加与此类似的代码。

super.paintBorder(c, g, x, y, width, height);

Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));

Shape clip = g2d.getClip();
Area rect = new Area(clip);
rect.subtract(new Area(new RoundRectangle2D.Double(x, y, width, height, radii, radii)));
g2d.setClip(rect);
g2d.setColor(c.getParent().getBackground());
g2d.fillRect(0, 0, width, height);
g2d.setClip(clip);
g2d.draw(rect);

现在有两种主要方法可以在边框周围绘制斜角效果，但取决于您想要斜角的复杂程度，取决于您使用的方式。 对于使用2种颜色的简单斜角边框，您可以使用与此类似的东西。

g2d.setColor(inner); //Inner Rectangle
g2d.draw(new RoundRectangle2D.Double(x + 1, y + 1, width - 2, height - 2, radii, radii));

g2d.setColor(outer); //Outer Rectangle
g2d.draw(new RoundRectangle2D.Double(x, y, width - 2, height - 2, radii, radii));

但是，如果要使用使用4种不同颜色的更复杂的斜角边框，则需要查看javax.swing.border.BevelBorder的源代码。 这将向您显示您需要一段与此类似的代码。

double offset = radii / 2;
//Outer
g2d.setColor(outerH);
g2d.draw(new Line2D.Double(0, offset, 0, height - 2 - offset)); //Left
g2d.draw(new Line2D.Double(1 + offset, 0, width - 2 - offset, 0)); //Top
g2d.draw(new Arc2D.Double(width - radii - 1, 0, radii, radii, 0, 90, Arc2D.OPEN)); //Top Right
g2d.draw(new Arc2D.Double(0, 0, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left

//Inner
g2d.setColor(innerH);
g2d.draw(new Line2D.Double(1, 1 + offset, 1, height - 3 - offset)); //Left
g2d.draw(new Line2D.Double(2 + offset, 1, width - 3 - offset, 1)); //Top
g2d.draw(new Arc2D.Double(width - radii - 2, 1, radii, radii, 0, 90, Arc2D.OPEN)); //Top Right
g2d.draw(new Arc2D.Double(1, 1, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left

//Outer
g2d.setColor(outer);
g2d.draw(new Line2D.Double(offset, height - 1, width - 1 - offset, height - 1)); //Bottom
g2d.draw(new Line2D.Double(width - 1, offset, width - 1, height - 2 - offset)); //Right
g2d.draw(new Arc2D.Double(width - radii - 1, height - radii - 1, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
g2d.draw(new Arc2D.Double(0, height - radii - 1, radii, radii, 180, 90, Arc2D.OPEN)); //Bottom Left

//Inner
g2d.setColor(inner);
g2d.draw(new Line2D.Double(1 + offset, height - 2, width - 2 - offset, height - 2)); //Bottom
g2d.draw(new Line2D.Double(width - 2, 1 + offset, width - 2, height - 3 - offset)); //Right
g2d.draw(new Arc2D.Double(width - radii - 2, height - radii - 2, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
g2d.draw(new Arc2D.Double(1, height - radii - 2, radii, radii, 180, 90, Arc2D.OPEN)); //Bottom Left

如果颜色在拐角处中途停止很重要，您也可以使用以下代码。

double offset = radii / 2;
//Outer
g2d.setColor(outerH);
g2d.draw(new Line2D.Double(0, offset, 0, height - 2 - offset)); //Left
g2d.draw(new Line2D.Double(1 + offset, 0, width - 2 - offset, 0)); //Top
g2d.draw(new Arc2D.Double(width - radii - 1, 0, radii, radii, 45, 45, Arc2D.OPEN)); //Top Right P1
g2d.draw(new Arc2D.Double(0, 0, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left
g2d.draw(new Arc2D.Double(0, height - radii - 1, radii, radii, 180, 45, Arc2D.OPEN)); //Bottom Left P1

//Inner
g2d.setColor(innerH);
g2d.draw(new Line2D.Double(1, 1 + offset, 1, height - 3 - offset)); //Left
g2d.draw(new Line2D.Double(2 + offset, 1, width - 3 - offset, 1)); //Top
g2d.draw(new Arc2D.Double(width - radii - 2, 1, radii, radii, 45, 45, Arc2D.OPEN)); //Top Right P1
g2d.draw(new Arc2D.Double(1, 1, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left
g2d.draw(new Arc2D.Double(1, height - radii - 2, radii, radii, 180, 45, Arc2D.OPEN)); //Bottom Left P1

//Outer
g2d.setColor(outerS);
g2d.draw(new Line2D.Double(offset, height - 1, width - 1 - offset, height - 1)); //Bottom
g2d.draw(new Line2D.Double(width - 1, offset, width - 1, height - 2 - offset)); //Right
g2d.draw(new Arc2D.Double(width - radii - 1, 0, radii, radii, 0, 45, Arc2D.OPEN)); //Top Right P2
g2d.draw(new Arc2D.Double(width - radii - 1, height - radii - 1, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
g2d.draw(new Arc2D.Double(0, height - radii - 1, radii, radii, 225, 45, Arc2D.OPEN)); //Bottom Left P2

//Inner
g2d.setColor(innerS);
g2d.draw(new Line2D.Double(1 + offset, height - 2, width - 2 - offset, height - 2)); //Bottom
g2d.draw(new Line2D.Double(width - 2, 1 + offset, width - 2, height - 3 - offset)); //Right
g2d.draw(new Arc2D.Double(width - radii - 2, 1, radii, radii, 0, 45, Arc2D.OPEN)); //Top Right P2
g2d.draw(new Arc2D.Double(width - radii - 2, height - radii - 2, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
g2d.draw(new Arc2D.Double(1, height - radii - 2, radii, radii, 225, 45, Arc2D.OPEN)); //Bottom Left P2

当我们将所有这些放在一起时，你得到一个看起来像这样的课程。

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.Arc2D;
import java.awt.geom.Area;
import java.awt.geom.Line2D;
import java.awt.geom.RoundRectangle2D;

import javax.swing.border.AbstractBorder;

@SuppressWarnings("serial")
public class RoundedBorder extends AbstractBorder {
    private int radii;
    private Insets insets;
    private Color innerS = new Color(166, 166, 166);
    private Color outerS = new Color(116, 116, 116);
    private Color innerH = Color.WHITE; 
    private Color outerH = Color.WHITE;
    private boolean tColor = false;

    public RoundedBorder(int radius) {
        radii = radius;
    }

    public RoundedBorder(int radius, Insets i) {
        radii = radius;
        insets = i;
    }

    public RoundedBorder(int radius, Insets i, Color out, Color in) {
        radii = radius;
        insets = i;
        innerS = in;
        outerS = out;
        tColor = true;
    }

    public RoundedBorder(int radius, Insets i, Color outH, Color inH, Color outS, Color inS) {
        radii = radius;
        insets = i;
        innerS = inS;
        outerS = outS;
        innerH = inH;
        outerH = outH;
    }

    @Override
    public Insets getBorderInsets(Component c) {
        if(insets != null) {
            return insets;
        }
        return new Insets(5, 5, 5, 5);
    }

    @Override
    public Insets getBorderInsets(Component c, Insets insets) {
        return getBorderInsets(c);
    }

    @Override
    public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
        super.paintBorder(c, g, x, y, width, height);

        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON));

        Shape clip = g2d.getClip();
        Area rect = new Area(clip);
        rect.subtract(new Area(new RoundRectangle2D.Double(x, y, width, height, radii, radii)));
        g2d.setClip(rect);
        g2d.setColor(c.getParent().getBackground());
        g2d.fillRect(0, 0, width, height);
        g2d.setClip(clip);
        g2d.draw(rect);

        if(!tColor) {
            double offset = radii / 2;
            //Outer
            g2d.setColor(outerH);
            g2d.draw(new Line2D.Double(0, offset, 0, height - 2 - offset)); //Left
            g2d.draw(new Line2D.Double(1 + offset, 0, width - 2 - offset, 0)); //Top
            g2d.draw(new Arc2D.Double(width - radii - 1, 0, radii, radii, 45, 45, Arc2D.OPEN)); //Top Right P1
            g2d.draw(new Arc2D.Double(0, 0, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left
            g2d.draw(new Arc2D.Double(0, height - radii - 1, radii, radii, 180, 45, Arc2D.OPEN)); //Bottom Left P1

            //Inner
            g2d.setColor(innerH);
            g2d.draw(new Line2D.Double(1, 1 + offset, 1, height - 3 - offset)); //Left
            g2d.draw(new Line2D.Double(2 + offset, 1, width - 3 - offset, 1)); //Top
            g2d.draw(new Arc2D.Double(width - radii - 2, 1, radii, radii, 45, 45, Arc2D.OPEN)); //Top Right P1
            g2d.draw(new Arc2D.Double(1, 1, radii, radii, 90, 90, Arc2D.OPEN)); //Top Left
            g2d.draw(new Arc2D.Double(1, height - radii - 2, radii, radii, 180, 45, Arc2D.OPEN)); //Bottom Left P1

            //Outer
            g2d.setColor(outerS);
            g2d.draw(new Line2D.Double(offset, height - 1, width - 1 - offset, height - 1)); //Bottom
            g2d.draw(new Line2D.Double(width - 1, offset, width - 1, height - 2 - offset)); //Right
            g2d.draw(new Arc2D.Double(width - radii - 1, 0, radii, radii, 0, 45, Arc2D.OPEN)); //Top Right P2
            g2d.draw(new Arc2D.Double(width - radii - 1, height - radii - 1, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
            g2d.draw(new Arc2D.Double(0, height - radii - 1, radii, radii, 225, 45, Arc2D.OPEN)); //Bottom Left P2

            //Inner
            g2d.setColor(innerS);
            g2d.draw(new Line2D.Double(1 + offset, height - 2, width - 2 - offset, height - 2)); //Bottom
            g2d.draw(new Line2D.Double(width - 2, 1 + offset, width - 2, height - 3 - offset)); //Right
            g2d.draw(new Arc2D.Double(width - radii - 2, 1, radii, radii, 0, 45, Arc2D.OPEN)); //Top Right P2
            g2d.draw(new Arc2D.Double(width - radii - 2, height - radii - 2, radii, radii, 270, 90, Arc2D.OPEN)); //Bottom Right
            g2d.draw(new Arc2D.Double(1, height - radii - 2, radii, radii, 225, 45, Arc2D.OPEN)); //Bottom Left P2
        } else {
            g2d.setColor(innerS); //Inner Rectangle
            g2d.draw(new RoundRectangle2D.Double(x + 1, y + 1, width - 2, height - 2, radii, radii));

            g2d.setColor(outerS); //Outer Rectangle
            g2d.draw(new RoundRectangle2D.Double(x, y, width - 2, height - 2, radii, radii));
        }
    }
}

现在，您只需执行yourComponent.setBorder(new RoundedBorder(10));就可以在组件上实现此类yourComponent.setBorder(new RoundedBorder(10)); 或者使用RoundedBorder类的其他构造函数之一。