95 lines
3.1 KiB
Java
95 lines
3.1 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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* An example for drawing rectangles and ellipses.
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*
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* @author Frank Klawonn
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* Last change 07.01.2005
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*/
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public class RectangleEllipseExample extends Frame
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{
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//Constructor
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RectangleEllipseExample()
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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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//Generating and drawing a rectangle.
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Rectangle2D.Double r2d = new Rectangle2D.Double(50,60,150,100);
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g2d.draw(r2d);
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//Generating and drawing an ellipse.
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Ellipse2D.Double elli = new Ellipse2D.Double(250,60,150,100);
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g2d.draw(elli);
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g2d.setStroke(new BasicStroke(1.0f));
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//Drawing the rectangle which defines the ellipse (with thinner lines).
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Rectangle2D.Double r2delli = new Rectangle2D.Double(250,60,150,100);
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g2d.draw(r2delli);
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//Draw a coordinate system.
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drawSimpleCoordinateSystem(430,180,g2d);
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}
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/**
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* Draws a coordinate system (according to the window coordinates).
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*
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* @param xmax x-coordinate to which the x-axis should extend.
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* @param ymax y-coordinate to which the y-axis should extend.
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* @param g2d Graphics2D object for drawing.
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*/
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public static void drawSimpleCoordinateSystem(int xmax, int ymax,
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Graphics2D g2d)
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{
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int xOffset = 30;
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int yOffset = 50;
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int step = 20;
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String s;
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//Remember the actual font.
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Font fo = g2d.getFont();
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//Use a small font.
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g2d.setFont(new Font("serif",Font.PLAIN,9));
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//x-axis
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g2d.drawLine(xOffset,yOffset,xmax,yOffset);
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//Marks and labels for the x-axis.
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for (int i=xOffset+step; i<=xmax; i=i+step)
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{
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g2d.drawLine(i,yOffset-2,i,yOffset+2);
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g2d.drawString(String.valueOf(i),i-7,yOffset-7);
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}
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//y-axis
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g2d.drawLine(xOffset,yOffset,xOffset,ymax);
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//Marks and labels for the y-axis.
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s=" "; //for indention of numbers < 100
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for (int i=yOffset+step; i<=ymax; i=i+step)
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{
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g2d.drawLine(xOffset-2,i,xOffset+2,i);
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if (i>99)
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{
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s="";
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}
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g2d.drawString(s+String.valueOf(i),xOffset-25,i+5);
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}
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//Reset to the original font.
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g2d.setFont(fo);
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}
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public static void main(String[] argv)
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{
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RectangleEllipseExample f = new RectangleEllipseExample();
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f.setTitle("Rectangle and ellipse");
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f.setSize(450,200);
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f.setVisible(true);
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}
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}
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