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