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丸みを帯びた角と透明な境界線

次のスクリーンショットは、TextBubbleBorderのテストを示しています1。長方形の外側にあるコンポーネントの角を完全に透明にし、その下にあるコンポーネントを表示したいと思います。 _Graphics2D_インスタンスにClip（丸い角の外側の領域を表す）を設定し、clearRect()。それは_Label 1_で見ることができます。

Border Test

ただし、親パネルに赤いBG（または非標準の色）がある場合、このアプローチの欠点がわかります。コーナーはデフォルトでデフォルトのパネル色になります（_Panel 2_で見やすい）。

最終的に、これを親コンテナの非標準色で動作させたいのですが、一部は グラデーションペイントでこのコンポーネントを複製するために何をする必要がありますか？ に触発されました

誰でもそれらの角を透明にする方法を知っていますか？

_import Java.awt.*;
import Java.awt.geom.*;
import javax.swing.*;
import javax.swing.border.*;

public class BorderTest {

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                JPanel gui = new JPanel(new GridLayout(1,0,5,5));
                gui.setBorder(new EmptyBorder(10,10,10,10));
                gui.setBackground(Color.RED);

                AbstractBorder brdr = new TextBubbleBorder(Color.BLACK,2,16,0);

                JLabel l1 = new JLabel("Label 1");
                l1.setBorder(brdr);
                gui.add(l1);

                JLabel l2 = new JLabel("Label 2");
                l2.setBorder(brdr);
                l2.setBackground(Color.YELLOW);
                l2.setOpaque(true);
                gui.add(l2);

                JPanel p1 = new JPanel();
                p1.add(new JLabel("Panel 1"));
                p1.setBorder(brdr);
                p1.setOpaque(false);
                gui.add(p1);

                JPanel p2 = new JPanel();
                p2.add(new JLabel("Panel 2"));
                p2.setBorder(brdr);
                gui.add(p2);

                JOptionPane.showMessageDialog(null, gui);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.Oracle.com/javase/tutorial/uiswing/concurrency/initial.html
        SwingUtilities.invokeLater(r);
    }

}

class TextBubbleBorder extends AbstractBorder {

    private Color color;
    private int thickness = 4;
    private int radii = 8;
    private int pointerSize = 7;
    private Insets insets = null;
    private BasicStroke stroke = null;
    private int strokePad;
    private int pointerPad = 4;
    RenderingHints hints;

    TextBubbleBorder(
            Color color) {
        new TextBubbleBorder(color, 4, 8, 7);
    }

    TextBubbleBorder(
            Color color, int thickness, int radii, int pointerSize) {
        this.thickness = thickness;
        this.radii = radii;
        this.pointerSize = pointerSize;
        this.color = color;

        stroke = new BasicStroke(thickness);
        strokePad = thickness / 2;

        hints = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        int pad = radii + strokePad;
        int bottomPad = pad + pointerSize + strokePad;
        insets = new Insets(pad, pad, bottomPad, pad);
    }

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

    @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) {

        Graphics2D g2 = (Graphics2D) g;

        int bottomLineY = height - thickness - pointerSize;

        RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
                0 + strokePad,
                0 + strokePad,
                width - thickness,
                bottomLineY,
                radii,
                radii);

        Polygon pointer = new Polygon();

        // left point
        pointer.addPoint(
                strokePad + radii + pointerPad,
                bottomLineY);
        // right point
        pointer.addPoint(
                strokePad + radii + pointerPad + pointerSize,
                bottomLineY);
        // bottom point
        pointer.addPoint(
                strokePad + radii + pointerPad + (pointerSize / 2),
                height - strokePad);

        Area area = new Area(bubble);
        area.add(new Area(pointer));

        g2.setRenderingHints(hints);

        Area spareSpace = new Area(new Rectangle(0, 0, width, height));
        spareSpace.subtract(area);
        g2.setClip(spareSpace);
        g2.clearRect(0, 0, width, height);
        g2.setClip(null);

        g2.setColor(color);
        g2.setStroke(stroke);
        g2.draw(area);
    }
}
_
  1. TextBubbleBorderは 背景画像付きJTextAreaの内部パディング のために考案されましたが（＆は上記の理由でテキスト領域が混乱していたためJLabelを使用することになりました） 、pointerSizeに0を指定すると、代わりに「角丸長方形」になります。

javaswingawtbordertransparency
29
Andrew Thompson

N.B.このコードにはクリッピングのバグがあり、これは paintComponent（）が他のコンポーネントに描画されています に対する受け入れられた回答で修正されています。これは、「クリッピングバグ修正」が組み込まれている場合にのみ、ソリューションと見なされる必要があります。

// Paint the BG color of the parent, everywhere outside the clip
// of the text bubble.

次のように正しく表示されるソースのコードのこのポイントを参照してください。

BorderTest with 0px speech pointer

BorderTest with 16px speech pointer

import Java.awt.*;
import Java.awt.image.*;
import Java.awt.geom.*;
import javax.swing.*;
import javax.swing.border.*;

public class BorderTest {

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                JPanel gui = new JPanel(new GridLayout(2,0,5,5));
                gui.setBorder(new EmptyBorder(10,10,10,10));
                gui.setBackground(Color.RED);

                AbstractBorder brdrLeft = new TextBubbleBorder(Color.BLACK,2,16,16);
                AbstractBorder brdrRight = new TextBubbleBorder(Color.BLACK,2,16,16,false);

                JLabel l1 = new JLabel("Label 1");
                l1.setBorder(brdrRight);
                gui.add(l1);

                JLabel l2 = new JLabel("Label 2");
                l2.setBorder(brdrLeft);
                l2.setBackground(Color.YELLOW);
                l2.setOpaque(true);
                gui.add(l2);

                JPanel p1 = new JPanel();
                p1.add(new JLabel("Panel 1"));
                p1.setBorder(brdrRight);
                p1.setOpaque(false);
                gui.add(p1);

                JPanel p2 = new JPanel();
                p2.add(new JLabel("Panel 2"));
                p2.setBorder(brdrLeft);
                gui.add(p2);

                JOptionPane.showMessageDialog(null, gui);
            }
        };
        // Swing GUIs should be created and updated on the EDT
        // http://docs.Oracle.com/javase/tutorial/uiswing/concurrency/initial.html
        SwingUtilities.invokeLater(r);
    }

}

class TextBubbleBorder extends AbstractBorder {

    private Color color;
    private int thickness = 4;
    private int radii = 8;
    private int pointerSize = 7;
    private Insets insets = null;
    private BasicStroke stroke = null;
    private int strokePad;
    private int pointerPad = 4;
    private boolean left = true;
    RenderingHints hints;

    TextBubbleBorder(
            Color color) {
        this(color, 4, 8, 7);
    }

    TextBubbleBorder(
            Color color, int thickness, int radii, int pointerSize) {
        this.thickness = thickness;
        this.radii = radii;
        this.pointerSize = pointerSize;
        this.color = color;

        stroke = new BasicStroke(thickness);
        strokePad = thickness / 2;

        hints = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        int pad = radii + strokePad;
        int bottomPad = pad + pointerSize + strokePad;
        insets = new Insets(pad, pad, bottomPad, pad);
    }

    TextBubbleBorder(
            Color color, int thickness, int radii, int pointerSize, boolean left) {
        this(color, thickness, radii, pointerSize);
        this.left = left;
    }

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

    @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) {

        Graphics2D g2 = (Graphics2D) g;

        int bottomLineY = height - thickness - pointerSize;

        RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
                0 + strokePad,
                0 + strokePad,
                width - thickness,
                bottomLineY,
                radii,
                radii);

        Polygon pointer = new Polygon();

        if (left) {
            // left point
            pointer.addPoint(
                    strokePad + radii + pointerPad,
                    bottomLineY);
            // right point
            pointer.addPoint(
                    strokePad + radii + pointerPad + pointerSize,
                    bottomLineY);
            // bottom point
            pointer.addPoint(
                    strokePad + radii + pointerPad + (pointerSize / 2),
                    height - strokePad);
        } else {
            // left point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad),
                    bottomLineY);
            // right point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad + pointerSize),
                    bottomLineY);
            // bottom point
            pointer.addPoint(
                    width - (strokePad + radii + pointerPad + (pointerSize / 2)),
                    height - strokePad);
        }

        Area area = new Area(bubble);
        area.add(new Area(pointer));

        g2.setRenderingHints(hints);

        // Paint the BG color of the parent, everywhere outside the clip
        // of the text bubble.
        Component parent  = c.getParent();
        if (parent!=null) {
            Color bg = parent.getBackground();
            Rectangle rect = new Rectangle(0,0,width, height);
            Area borderRegion = new Area(rect);
            borderRegion.subtract(area);
            g2.setClip(borderRegion);
            g2.setColor(bg);
            g2.fillRect(0, 0, width, height);
            g2.setClip(null);
        }

        g2.setColor(color);
        g2.setStroke(stroke);
        g2.draw(area);
    }
}
26
Andrew Thompson

これを試して：

  JPanel p = new JPanel() {
     @Override
     protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Dimension arcs = new Dimension(15,15); //Border corners arcs {width,height}, change this to whatever you want
        int width = getWidth();
        int height = getHeight();
        Graphics2D graphics = (Graphics2D) g;
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);


        //Draws the rounded panel with borders.
        graphics.setColor(getBackground());
        graphics.fillRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height);//Paint background
        graphics.setColor(getForeground());
        graphics.drawRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height);//Paint border
     }
  };

私のテストで：

  JFrame f = new JFrame();
  f.setLayout(null);
  f.setDefaultCloseOperation(3);
  f.setSize(500, 500);
  JPanel p = new JPanel() {
     @Override
     protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Dimension arcs = new Dimension(15,15);
        int width = getWidth();
        int height = getHeight();
        Graphics2D graphics = (Graphics2D) g;
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);


        //Draws the rounded opaque panel with borders.
        graphics.setColor(getBackground());
        graphics.fillRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height);//Paint background
        graphics.setColor(getForeground());
        graphics.drawRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height);//Paint border
     }
  };
  p.setBounds(10,10,100,30);
  p.setOpaque(false);
  f.getContentPane().setBackground(Color.red);
  f.add(p);
  f.show();

結果は次のとおりです。

Code result

16
BackSlash

ありがとう、@ BackSlash、素敵でシンプル。これを拡張して、より再利用できるようにしました。これにより、コンストラクターで背景色を設定することもできます。そして、楽しみのために円形パネルを作成する方法を示します。

enter image description here

import Java.awt.*;
import javax.swing.*;

public class RoundedPanelExample extends JFrame
{
    public RoundedPanelExample()
    {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("Rounded Panel Example");
        setResizable(true);
        setDefaultLookAndFeelDecorated(true);
        setSize(500, 500);

        Container pane = getContentPane();
        pane.setLayout(null);
        pane.setBackground(Color.LIGHT_GRAY);

        JPanel p1 = new RoundedPanel(10, Color.CYAN);
        p1.setBounds(10,10,100,60);
        p1.setOpaque(false);
        pane.add(p1);

        JPanel p2 = new RoundedPanel(15, Color.RED);
        p2.setBounds(150,10,50,50);
        p2.setOpaque(false);
        pane.add(p2);

        JPanel p3 = new RoundedPanel(30);
        p3.setBounds(230,10,100,150);
        p3.setOpaque(false);
        pane.add(p3);

        JPanel p4 = new RoundedPanel(20);
        p4.setBounds(10,200,100,100);
        p4.setBackground(Color.GREEN);
        p4.setOpaque(false);
        pane.add(p4);

        JPanel p5 = new RoundedPanel(200);
        p5.setBounds(150,200,200,200);
        p5.setBackground(Color.BLUE);
        p5.setOpaque(false);
        pane.add(p5);
    }

    public static void main(String[] args) 
    {
        RoundedPanelExample gui = new RoundedPanelExample();
        gui.setVisible(true);
    }

    class RoundedPanel extends JPanel
    {
        private Color backgroundColor;
        private int cornerRadius = 15;

        public RoundedPanel(LayoutManager layout, int radius) {
            super(layout);
            cornerRadius = radius;
        }

        public RoundedPanel(LayoutManager layout, int radius, Color bgColor) {
            super(layout);
            cornerRadius = radius;
            backgroundColor = bgColor;
        }

        public RoundedPanel(int radius) {
            super();
            cornerRadius = radius;
        }

        public RoundedPanel(int radius, Color bgColor) {
            super();
            cornerRadius = radius;
            backgroundColor = bgColor;
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Dimension arcs = new Dimension(cornerRadius, cornerRadius);
            int width = getWidth();
            int height = getHeight();
            Graphics2D graphics = (Graphics2D) g;
            graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            //Draws the rounded panel with borders.
            if (backgroundColor != null) {
                graphics.setColor(backgroundColor);
            } else {
                graphics.setColor(getBackground());
            }
            graphics.fillRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height); //Paint background
            graphics.setColor(getForeground());
            graphics.drawRoundRect(0, 0, width-1, height-1, arcs.width, arcs.height); //Paint border
        }
    }
}
4
Ryan