Comment dessiner un contour de texte dans AWT?

Essayez ce qui suit:

public void paintTextWithOutline(Graphics g) {
    String text = "some text";

    Color outlineColor = Color.white;
    Color fillColor = Color.black;
    BasicStroke outlineStroke = new BasicStroke(2.0f);

    if (g instanceof Graphics2D) {
        Graphics2D g2 = (Graphics2D) g;

        //remember original settings
        Color originalColor = g2.getColor();
        Stroke originalStroke = g2.getStroke();
        RenderingHints originalHints = g2.getRenderingHints();


        //create a glyph vector from your text
        GlyphVector glyphVector = getFont().createGlyphVector(g2.getFontRenderContext(), text);
        //get the shape object
        Shape textShape = glyphVector.getOutline();

        //activate anti aliasing for text rendering (if you want it to look nice)
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_RENDERING,
                RenderingHints.VALUE_RENDER_QUALITY);

        g2.setColor(outlineColor);
        g2.setStroke(outlineStroke);
        g2.draw(textShape); //draw outline

        g2.setColor(fillColor);
        g2.fill(textShape); //fill the shape

        //reset to original settings after painting
        g2.setColor(originalColor);
        g2.setStroke(originalStroke);
        g2.setRenderingHints(originalHints);
    }
}

OriginalL'auteur Eddo

Ici est un hacky exemple. Il n'est pas aussi sophistiqué que les autres, mais il est plus simple à comprendre, et il se comporte comme un JLabel.

public class OutlineLabel extends JLabel {
private Color outlineColor = Color.WHITE;
private boolean isPaintingOutline = false;
private boolean forceTransparent = false;
public OutlineLabel() {
super();
}
public OutlineLabel(String text) {
super(text);
}
public OutlineLabel(String text, int horizontalAlignment) {
super(text, horizontalAlignment);
}
public Color getOutlineColor() {
return outlineColor;
}
public void setOutlineColor(Color outlineColor) {
this.outlineColor = outlineColor;
this.invalidate();
}
@Override
public Color getForeground() {
if ( isPaintingOutline ) {
return outlineColor;
} else {
return super.getForeground();
}
}
@Override
public boolean isOpaque() {
if ( forceTransparent ) {
return false;
} else {
return super.isOpaque();
}
}
@Override
public void paint(Graphics g) {
String text = getText();
if ( text == null || text.length() == 0 ) {
super.paint(g);
return;
}
//1 2 3
//8 9 4
//7 6 5
if ( isOpaque() )
super.paint(g);
forceTransparent = true;
isPaintingOutline = true;
g.translate(-1, -1); super.paint(g); //1 
g.translate( 1,  0); super.paint(g); //2 
g.translate( 1,  0); super.paint(g); //3 
g.translate( 0,  1); super.paint(g); //4
g.translate( 0,  1); super.paint(g); //5
g.translate(-1,  0); super.paint(g); //6
g.translate(-1,  0); super.paint(g); //7
g.translate( 0, -1); super.paint(g); //8
g.translate( 1,  0); //9
isPaintingOutline = false;
super.paint(g);
forceTransparent = false;
}
public static void main(String[] args) {
JFrame w = new JFrame();
w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
OutlineLabel label = new OutlineLabel("Test", OutlineLabel.CENTER);
label.setOpaque(true);
w.setContentPane(new JPanel(new BorderLayout()));
w.add(label, BorderLayout.CENTER);
w.pack();
w.setVisible(true);
}
}

OriginalL'auteur Booyah Johnson