/** @(#)Transform.java   1.2 98/07/31*/import java.lang.Integer;import java.awt.*;import java.awt.event.*;import java.awt.font.*;import java.awt.geom.*;import java.awt.image.*;import java.awt.event.ItemListener;import java.awt.event.ItemEvent;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import javax.swing.*;/* * This applet renders a shape, selected by the user, with a paint,stroke, and rendering method, * also selected by the user.*/public class Transform extends JApplet implements ItemListener,ActionListener {    JLabel primLabel, lineLabel, paintLabel, transLabel, strokeLabel;    TransPanel display;    static JComboBox primitive, line, paint, trans, stroke;    JButton redraw;    public static boolean no2D = false;    public void init() {        GridBagLayout layOut = new GridBagLayout();        getContentPane().setLayout(layOut);        GridBagConstraints c = new GridBagConstraints();        c.weightx = 1.0;        c.fill = GridBagConstraints.BOTH;        primLabel = new JLabel();        primLabel.setText("Primitive");        Font newFont = getFont().deriveFont(1);        primLabel.setFont(newFont);        primLabel.setHorizontalAlignment(JLabel.CENTER);        layOut.setConstraints(primLabel, c);        getContentPane().add(primLabel);        lineLabel = new JLabel();        lineLabel.setText("Lines");        lineLabel.setFont(newFont);        lineLabel.setHorizontalAlignment(JLabel.CENTER);        layOut.setConstraints(lineLabel, c);        getContentPane().add(lineLabel);        paintLabel = new JLabel();        paintLabel.setText("Paints");        paintLabel.setFont(newFont);        paintLabel.setHorizontalAlignment(JLabel.CENTER);        layOut.setConstraints(paintLabel, c);        getContentPane().add(paintLabel);        c.gridwidth = GridBagConstraints.RELATIVE;        transLabel = new JLabel();          transLabel.setText("Transforms");        transLabel.setFont(newFont);        transLabel.setHorizontalAlignment(JLabel.CENTER);        layOut.setConstraints(transLabel, c);        getContentPane().add(transLabel);        c.gridwidth = GridBagConstraints.REMAINDER;        strokeLabel = new JLabel();        strokeLabel.setText("Rendering");        strokeLabel.setFont(newFont);        strokeLabel.setHorizontalAlignment(JLabel.CENTER);         layOut.setConstraints(strokeLabel, c);        getContentPane().add(strokeLabel);        GridBagConstraints ls = new GridBagConstraints();        ls.weightx = 1.0;        ls.fill = GridBagConstraints.BOTH;        primitive = new JComboBox( new Object []{                                   "rectangle",                                   "ellipse",                                   "text"});        primitive.addItemListener(this);        newFont = newFont.deriveFont(0, 14.0f);        primitive.setFont(newFont);        layOut.setConstraints(primitive, ls);        getContentPane().add(primitive);        line = new JComboBox( new Object []{                                "thin",                              "thick",                              "dashed"});        line.addItemListener(this);        line.setFont(newFont);        layOut.setConstraints(line, ls);        getContentPane().add(line);        paint = new JComboBox( new Object[]{                               "solid",                               "gradient",                               "polka"});        paint.addItemListener(this);        paint.setFont(newFont);        layOut.setConstraints(paint, ls);        getContentPane().add(paint);        ls.gridwidth = GridBagConstraints.RELATIVE;        trans = new JComboBox( new Object[]{				"Identity",				"rotate",				"scale",				"shear"});	trans.addItemListener(this);	trans.setFont(newFont);	layOut.setConstraints(trans, ls);	getContentPane().add(trans);        ls.gridwidth = GridBagConstraints.REMAINDER;        stroke = new JComboBox( new Object[]{                                "Stroke",                                "Fill",                                "Stroke & Fill"});         stroke.addItemListener(this);        stroke.setFont(newFont);        layOut.setConstraints(stroke, ls);        getContentPane().add(stroke);	GridBagConstraints button = new GridBagConstraints();	button.gridwidth = GridBagConstraints.REMAINDER;	redraw = new JButton("Redraw");	redraw.addActionListener(this);        redraw.setFont(newFont);        layOut.setConstraints(redraw, button);        getContentPane().add(redraw);        GridBagConstraints tP = new GridBagConstraints();        tP.fill = GridBagConstraints.BOTH;        tP.weightx = 1.0;        tP.weighty = 1.0;        tP.gridwidth = GridBagConstraints.REMAINDER;        display = new TransPanel();        layOut.setConstraints(display, tP);        display.setBackground(Color.white);        getContentPane().add(display);        validate();    }    public void itemStateChanged(ItemEvent e){}   public void actionPerformed(ActionEvent e) {        display.setTrans(trans.getSelectedIndex());        display.renderShape();   }	    public static void main( String[] argv ) {        if ( argv.length > 0 && argv[0].equals( "-no2d" ) ) {            Transform.no2D = true;        }                JFrame frame = new JFrame( "Transform" );        frame.addWindowListener( new WindowAdapter(){            public void windowClosing( WindowEvent e ){                System.exit( 0 );            }        });                             JApplet applet = new Transform();        frame.getContentPane().add( BorderLayout.CENTER, applet );                applet.init();                frame.setSize( 550, 400 );        frame.show();   }}class TransPanel extends JPanel {    AffineTransform at = new AffineTransform();    int w, h;    Shape shapes[] = new Shape[3];    BufferedImage bi;    boolean firstTime = true;    public TransPanel(){        setBackground(Color.white);        shapes[0] = new Rectangle(0, 0, 100, 100);        shapes[1] = new Ellipse2D.Double(0.0, 0.0, 100.0, 100.0);        TextLayout textTl = new TextLayout("Text", new Font("Helvetica", 1, 96), new FontRenderContext(null, false, false));	AffineTransform textAt = new AffineTransform();	textAt.translate(0, (float)textTl.getBounds().getHeight());        shapes[2] = textTl.getOutline(textAt);    }    public void setTrans(int transIndex) {        // Sets the AffineTransform.        switch ( transIndex ) {        case 0 : at.setToIdentity();            at.translate(w/2, h/2); break;        case 1 : at.rotate(Math.toRadians(45)); break;        case 2 : at.scale(0.5, 0.5); break;        case 3 : at.shear(0.5, 0.0); break;      }    }	    public void renderShape() {        repaint();    }    public void paintComponent(Graphics g) {	super.paintComponent(g);			if ( !Transform.no2D ) {	        Graphics2D g2 = (Graphics2D) g;        	Dimension d = getSize();        	w = d.width;        	h = d.height;        // Prints out the intructions.        String instruct = "Pick a primitive, line style, paint, transform,";        TextLayout thisTl = new TextLayout(instruct, new Font("Helvetica", 0, 10), g2.getFontRenderContext());        float width = (float)thisTl.getBounds().getWidth();	float height = (float)thisTl.getBounds().getHeight();        thisTl.draw(g2, w/2-width/2, 15);	instruct = "and rendering method and click the Redraw button.";        thisTl = new TextLayout(instruct, new Font("Helvetica", 0, 10), g2.getFontRenderContext());        width = (float)thisTl.getBounds().getWidth();        thisTl.draw(g2, w/2-width/2, height + 17);	// Initialize the transform.	if (firstTime) {	    at.setToIdentity();            at.translate(w/2, h/2);            firstTime = false;	}        // Sets the Stroke.	Stroke oldStroke = g2.getStroke();        switch ( Transform.line.getSelectedIndex() ) {        case 0 : g2.setStroke(new BasicStroke(3.0f)); break;        case 1 : g2.setStroke(new BasicStroke(8.0f)); break;        case 2 : float dash[] = {10.0f};            g2.setStroke(new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash, 0.0f));            break;        }        // Sets the Paint.	Paint oldPaint = g2.getPaint();        switch ( Transform.paint.getSelectedIndex() ) {        case 0 : g2.setPaint(Color.blue);break;        case 1 : g2.setPaint(new GradientPaint(0, 0, Color.lightGray, w-250, h, Color.blue, false));            break;        case 2 : BufferedImage buffi = new BufferedImage(15, 15, BufferedImage.TYPE_INT_RGB);            Graphics2D buffig = buffi.createGraphics();            buffig.setColor(Color.blue);            buffig.fillRect(0, 0, 15, 15);            buffig.setColor(Color.lightGray);	    buffig.translate((15/2)-(5/2), (15/2)-(5/2));            buffig.fillOval(0, 0, 7, 7);             Rectangle r = new Rectangle(0,0,25,25);            g2.setPaint(new TexturePaint(buffi, r));            break;        }        // Sets the Shape.        Shape shape = shapes[Transform.primitive.getSelectedIndex()];        Rectangle r = shape.getBounds();        // Sets the selected Shape to the center of the Canvas.        AffineTransform saveXform = g2.getTransform(); 	AffineTransform toCenterAt = new AffineTransform();        toCenterAt.concatenate(at);        toCenterAt.translate(-(r.width/2), -(r.height/2));        g2.transform(toCenterAt);        // Sets the rendering method.        switch ( Transform.stroke.getSelectedIndex() ) {        case 0 : g2.draw(shape); break;        case 1 : g2.fill(shape); break;        case 2 : Graphics2D tempg2 = g2;            g2.fill(shape);            g2.setColor(Color.darkGray);            g2.draw(shape);            g2.setPaint(tempg2.getPaint()); break;           }	g2.setStroke(oldStroke);	g2.setPaint(oldPaint);        g2.setTransform(saveXform);		}}}