transformanim.java

功能强大的绘图演示程序

        Object object;
        Paint paint;
        static final int UP = 0;
        static final int DOWN = 1;
        double x, y;
        double ix=5, iy=3;
        int rotate;
        double scale, shear;
        int scaleDirection, shearDirection;
        AffineTransform at = new AffineTransform();


        public ObjectData(Object object, Paint paint) {
            this.object = object;
            this.paint = paint;
            rotate = (int)(Math.random() * 360);
            scale = Math.random() * 1.5;
            scaleDirection = Math.random() > 0.5 ? UP : DOWN;
            shear = Math.random() * 0.5;
            shearDirection = Math.random() > 0.5 ? UP : DOWN;
        }


        public void reset(int w, int h) {
            x = Math.random()*w;
            y = Math.random()*h;
            double ww = 20 + Math.random()*((w == 0 ? 400 : w)/4);
            double hh = 20 + Math.random()*((h == 0 ? 300 : h)/4);
            if (object instanceof Ellipse2D) {
                ((Ellipse2D) object).setFrame(0, 0, ww, hh);
            } else if (object instanceof Rectangle2D) {
                ((Rectangle2D) object).setRect(0, 0, ww, ww);
            } else if (object instanceof RoundRectangle2D) {
                ((RoundRectangle2D) object).setRoundRect(0, 0, hh, hh, 20, 20); 
            } else if (object instanceof Arc2D) {
                ((Arc2D) object).setArc(0, 0, hh, hh, 45, 270, Arc2D.PIE);
            } else if (object instanceof QuadCurve2D) {
                ((QuadCurve2D) object).setCurve(0, 0, w*.2, h*.4, w*.4, 0);
            } else if (object instanceof CubicCurve2D) {
                    ((CubicCurve2D) object).setCurve(0,0,30,-60,60,60,90,0);
            } else if (object instanceof GeneralPath) {
                GeneralPath p = new GeneralPath();
                float size = (float) ww;
                p.moveTo(- size / 2.0f, - size / 8.0f);
                p.lineTo(+ size / 2.0f, - size / 8.0f);
                p.lineTo(- size / 4.0f, + size / 2.0f);
                p.lineTo(+         0.0f, - size / 2.0f);
                p.lineTo(+ size / 4.0f, + size / 2.0f);
                p.closePath();
                object = p;
            }
        }


        public void step(int w, int h, TransformAnim demo) {
            at.setToIdentity();
            if (demo.doRotate) {
                if ((rotate+=5) == 360) {
                    rotate = 0;
                }
                at.rotate(Math.toRadians(rotate), x, y);
            }
            at.translate(x, y);
            if (demo.doTranslate) {
                x += ix;
                y += iy;
                if (x > w) {
                    x = w - 1;
                    ix = Math.random() * -w/32 - 1;
                }
                if (x < 0) {
                    x = 2;
                    ix = Math.random() * w/32 + 1;
                }
                if (y > h ) {
                    y = h - 2;
                    iy = Math.random() * -h/32 - 1;
                }
                if (y < 0) {
                    y = 2;
                    iy = Math.random() * h/32 + 1;
                }
            }
            if (demo.doScale && scaleDirection == UP) {
                if ((scale += 0.05) > 1.5) {
                    scaleDirection = DOWN;
                }
            } else if (demo.doScale && scaleDirection == DOWN) {
                if ((scale -= .05) < 0.5) {
                    scaleDirection = UP;
                }
            }
            if (demo.doScale) {
                at.scale(scale, scale);
            }
            if (demo.doShear && shearDirection == UP) {
                if ((shear += 0.05) > 0.5) {
                    shearDirection = DOWN;
                }
            } else if (demo.doShear && shearDirection == DOWN) {
                if ((shear -= .05) < -0.5) {
                    shearDirection = UP;
                }
            }
            if (demo.doShear) {
                at.shear(shear, shear);
            }
        }
    } // End ObjectData class



    static class DemoControls extends CustomControls implements ActionListener, ChangeListener {

        TransformAnim demo;
        JSlider shapeSlider, stringSlider, imageSlider;
        Font font = new Font("serif", Font.BOLD, 10);
        JToolBar toolbar;
        ButtonBorder buttonBorder = new ButtonBorder();

        public DemoControls(TransformAnim demo) {
            super(demo.name);
            this.demo = demo;
            setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
            add(Box.createVerticalStrut(5));

            JToolBar bar = new JToolBar(JToolBar.VERTICAL);
            bar.setFloatable(false);
            shapeSlider = new JSlider(JSlider.HORIZONTAL,0,20,demo.numShapes);
            shapeSlider.addChangeListener(this);
            TitledBorder tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numShapes) + " Shapes");
            shapeSlider.setBorder(tb);
            shapeSlider.setOpaque(true);
            shapeSlider.setPreferredSize(new Dimension(80,44));
            bar.add(shapeSlider);
            bar.addSeparator();

            stringSlider = new JSlider(JSlider.HORIZONTAL,0,10,demo.numStrings);
            stringSlider.addChangeListener(this);
            tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numStrings) + " Strings");
            stringSlider.setBorder(tb);
            stringSlider.setOpaque(true);
            stringSlider.setPreferredSize(new Dimension(80,44));
            bar.add(stringSlider);
            bar.addSeparator();

            imageSlider = new JSlider(JSlider.HORIZONTAL,0,10,demo.numImages);
            imageSlider.addChangeListener(this);
            tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numImages) + " Images");
            imageSlider.setBorder(tb);
            imageSlider.setOpaque(true);
            imageSlider.setPreferredSize(new Dimension(80,44));
            bar.add(imageSlider);
            bar.addSeparator();
            add(bar);

            toolbar = new JToolBar();
            toolbar.setFloatable(false);
            addButton("T", "translate", demo.doTranslate);
            addButton("R", "rotate", demo.doRotate);
            addButton("SC", "scale", demo.doScale);
            addButton("SH", "shear", demo.doShear);
            add(toolbar);
        }


        public void addButton(String s, String tt, boolean state) {
            JToggleButton b = (JToggleButton) toolbar.add(new JToggleButton(s));
            b.setFont(font);
            b.setSelected(state);
            b.setToolTipText(tt);
            b.setFocusPainted(false);
            b.setBorder(buttonBorder);
            b.addActionListener(this);
        }


        public void actionPerformed(ActionEvent e) {
            JToggleButton b = (JToggleButton) e.getSource();
            if (b.getText().equals("T")) {
                demo.doTranslate = b.isSelected();
            } else if (b.getText().equals("R")) {
                demo.doRotate = b.isSelected();
            } else if (b.getText().equals("SC")) {
                demo.doScale = b.isSelected();
            } else if (b.getText().equals("SH")) {
                demo.doShear = b.isSelected();
            }
            if (demo.animating.thread == null) {
                demo.repaint();
            }
        }


        public void stateChanged(ChangeEvent e) {
            JSlider slider = (JSlider) e.getSource();
            int value = slider.getValue();
            TitledBorder tb = (TitledBorder) slider.getBorder();
            if (slider.equals(shapeSlider)) {
                tb.setTitle(String.valueOf(value) + " Shapes");
                demo.setShapes(value);
            } else if (slider.equals(stringSlider)) {
                tb.setTitle(String.valueOf(value) + " Strings");
                demo.setStrings(value);
            } else if (slider.equals(imageSlider)) {
                tb.setTitle(String.valueOf(value) + " Images");
                demo.setImages(value);
            } 
            if (demo.animating.thread == null) {
                demo.repaint();
            }
            slider.repaint();
        }


        public Dimension getPreferredSize() {
            return new Dimension(80,38);
        }


        public void run() {
            Thread me = Thread.currentThread();
            while (thread == me) {
                for (int i = 1; i < toolbar.getComponentCount(); i++) {
                    try {
                        thread.sleep(4444);
                    } catch (InterruptedException e) { return; }
                    ((AbstractButton) toolbar.getComponentAtIndex(i)).doClick();
                }
            }
            thread = null;
        }
    } // End DemoControls
} // End TransformAnim