109 lines
3.7 KiB
Java
109 lines
3.7 KiB
Java
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Text on Circle border
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import java.awt.*;
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import java.awt.event.*;
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import java.awt.geom.*;
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public class CircleTextDemo extends Canvas {
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Frame myframe;
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TextField text;
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Font myfont;
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Color textcolor;
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Color circlecolor;
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public CircleTextDemo() {
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this("Serif", Font.PLAIN, 18, Color.pink, Color.black);
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}
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public CircleTextDemo(String ff, int fs, int fz, Color bg, Color fg) {
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setBackground(bg);
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circlecolor = bg.brighter();
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textcolor = fg;
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myfont = new Font(ff, fs, fz);
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text = new TextField("Text on a circle using Java 2D Graphics!");
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myframe = new Frame("CircleTextDemo");
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myframe.add(text, BorderLayout.NORTH);
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myframe.add(this, BorderLayout.CENTER);
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myframe.setSize(new Dimension(300,340));
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myframe.setLocation(150,140);
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myframe.addWindowListener(new WindowAdapter() {
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public void windowClosing(WindowEvent we) {
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System.exit(0);
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}
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});
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text.addActionListener(new ActionListener() {
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public void actionPerformed(ActionEvent ae) {
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repaint();
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}
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});
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myframe.setVisible(true);
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}
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public void paint(Graphics g) {
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String st = text.getText();
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if (st.length() == 0) return;
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if (g instanceof Graphics2D) {
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Dimension cd = getSize();
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Point pt = new Point(cd.width / 2, cd.height / 2);
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int radius = (int)(pt.x * 0.84);
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g.setColor(circlecolor);
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g.drawArc(pt.x - radius, pt.y - radius,
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radius*2-1, radius*2-1,
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0, 360);
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g.setColor(textcolor);
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g.setFont(myfont);
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drawCircleText((Graphics2D)g, st, pt, radius, -Math.PI/2, 1.0);
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}
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else {
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System.out.println("Cannot draw curved text without a Graphics2D");
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}
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}
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/**
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* Draw a piece of text on a circular curve, one
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* character at a time. This is harder than it looks.
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*/
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static void drawCircleText(Graphics2D g, String st, Point center,
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double r, double a1, double af)
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{
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double curangle = a1;
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Point2D c = new Point2D.Double(center.x, center.y);
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char ch[] = st.toCharArray();
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FontMetrics fm = g.getFontMetrics();
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AffineTransform xform1, cxform;
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xform1 = AffineTransform.getTranslateInstance(c.getX(),c.getY());
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for(int i = 0; i < ch.length; i++) {
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double cwid = (double)(getWidth(ch[i],fm));
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if (!(ch[i] == ' ' || Character.isSpaceChar(ch[i]))) {
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cwid = (double)(fm.charWidth(ch[i]));
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cxform = new AffineTransform(xform1);
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cxform.rotate(curangle, 0.0, 0.0);
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String chstr = new String(ch, i, 1);
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g.setTransform(cxform);
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g.drawString(chstr, (float)(-cwid/2), (float)(-r));
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}
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// compute advance of angle assuming cwid<
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if (i < (ch.length - 1)) {
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double adv = cwid/2.0 + fm.getLeading() + getWidth(ch[i + 1],fm)/2.0;
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curangle += Math.sin(adv / r);
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}
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}
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}
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static int getWidth(char c, FontMetrics fm) {
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if (c == ' ' || Character.isSpaceChar(c)) {
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return fm.charWidth('n');
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}
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else {
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return fm.charWidth(c);
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}
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}
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public static void main(String args[]) {
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CircleTextDemo ctd;
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ctd = new CircleTextDemo();
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}
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}
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