87 lines
2.5 KiB
Java
87 lines
2.5 KiB
Java
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import java.awt.*;
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import java.awt.geom.*;
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/**
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* The letter D is defined by a GeneralPath and the letter and the
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* control points are drawn.
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*
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* @author Frank Klawonn
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* Last change 01.02.2005
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*/
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public class SimpleLetterD extends Frame
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{
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//Constructor
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public SimpleLetterD()
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{
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//Enables the closing of the window.
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addWindowListener(new MyFinishWindow());
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}
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public void paint(Graphics g)
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{
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Graphics2D g2d = (Graphics2D) g;
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//Use of antialiasing to have nicer lines.
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
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//The lines should have a thickness of 3.0 instead of 1.0.
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BasicStroke bs = new BasicStroke(3.0f);
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g2d.setStroke(bs);
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//The control points for defining the letter.
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int xd1 = 50;
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int yd1 = 50;
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int xd2 = 50;
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int yd2 = 450;
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int xd3 = 400;
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int yd3 = 250;
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int xd4 = 50;
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int yd4 = 450;
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int xd5 = 50;
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int yd5 = 250;
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//Definition and drawing of the two curves that define the letter.
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QuadCurve2D.Double d1 = new QuadCurve2D.Double(xd1,yd1,xd3,yd3,xd2,yd2);
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g2d.draw(d1);
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QuadCurve2D.Double d2 = new QuadCurve2D.Double(xd1,yd1,xd5,yd5,xd4,yd4);
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g2d.draw(d2);
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//Draw the control points.
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drawSmallRect(xd1,yd1,g2d);
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drawSmallRect(xd2,yd2,g2d);
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drawSmallRect(xd3,yd3,g2d);
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drawSmallRect(xd4,yd4,g2d);
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drawSmallRect(xd5,yd5,g2d);
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//Label the control points.
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g2d.setFont(new Font("serif",Font.PLAIN,24));
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g2d.drawString("P1",xd1+5,yd1);
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g2d.drawString("P2",xd2-40,yd2+10);
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g2d.drawString("P3",xd3-35,yd3+4);
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g2d.drawString("P4",xd4+20,yd4+10);
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g2d.drawString("P5",xd5+10,yd5+10);
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}
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/**
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* Draws a small square around the centre (x,y).
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*
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* @param x x-coordinate of the centre
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* @param y y-coordinate of the centre
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* @param g2d Graphics2D object for drawing
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*/
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public static void drawSmallRect(int x, int y, Graphics2D g2d)
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{
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Rectangle rect = new Rectangle(x-4,y-3,8,8);
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g2d.fill(rect);
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}
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public static void main(String[] argv)
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{
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SimpleLetterD f = new SimpleLetterD();
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f.setTitle("The letter D");
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f.setSize(420,500);
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f.setVisible(true);
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}
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}
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