defaultdrawingsupplier.java

java图形利器

        Shape result = this.shapeSequence[
                this.shapeIndex % this.shapeSequence.length];
        this.shapeIndex++;
        return result;
    }

    /**
     * Creates an array of standard shapes to display for the items in series 
     * on charts.
     *
     * @return The array of shapes.
     */
    public static Shape[] createStandardSeriesShapes() {

        Shape[] result = new Shape[10];

        double size = 6.0;
        double delta = size / 2.0;
        int[] xpoints = null;
        int[] ypoints = null;

        // square
        result[0] = new Rectangle2D.Double(-delta, -delta, size, size);
        // circle
        result[1] = new Ellipse2D.Double(-delta, -delta, size, size);

        // up-pointing triangle
        xpoints = intArray(0.0, delta, -delta);
        ypoints = intArray(-delta, delta, delta);
        result[2] = new Polygon(xpoints, ypoints, 3);

        // diamond
        xpoints = intArray(0.0, delta, 0.0, -delta);
        ypoints = intArray(-delta, 0.0, delta, 0.0);
        result[3] = new Polygon(xpoints, ypoints, 4);

        // horizontal rectangle
        result[4] = new Rectangle2D.Double(-delta, -delta / 2, size, size / 2);

        // down-pointing triangle
        xpoints = intArray(-delta, +delta, 0.0);
        ypoints = intArray(-delta, -delta, delta);
        result[5] = new Polygon(xpoints, ypoints, 3);

        // horizontal ellipse
        result[6] = new Ellipse2D.Double(-delta, -delta / 2, size, size / 2);

        // right-pointing triangle
        xpoints = intArray(-delta, delta, -delta);
        ypoints = intArray(-delta, 0.0, delta);
        result[7] = new Polygon(xpoints, ypoints, 3);

        // vertical rectangle
        result[8] = new Rectangle2D.Double(-delta / 2, -delta, size / 2, size);

        // left-pointing triangle
        xpoints = intArray(-delta, delta, delta);
        ypoints = intArray(0.0, -delta, +delta);
        result[9] = new Polygon(xpoints, ypoints, 3);

        return result;

    }

    /**
     * Tests this object for equality with another object.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {

        if (obj == this) {
            return true;
        }

        if (!(obj instanceof DefaultDrawingSupplier)) {
            return false;
        }

        DefaultDrawingSupplier that = (DefaultDrawingSupplier) obj;

        if (!Arrays.equals(this.paintSequence, that.paintSequence)) {
            return false;
        }
        if (this.paintIndex != that.paintIndex) {
            return false;   
        }
        if (!Arrays.equals(this.outlinePaintSequence, 
                that.outlinePaintSequence)) {
            return false;
        }
        if (this.outlinePaintIndex != that.outlinePaintIndex) {
            return false;
        }
        if (!Arrays.equals(this.strokeSequence, that.strokeSequence)) {
            return false;
        }
        if (this.strokeIndex != that.strokeIndex) {
            return false;   
        }
        if (!Arrays.equals(this.outlineStrokeSequence, 
                that.outlineStrokeSequence)) {
            return false;
        }
        if (this.outlineStrokeIndex != that.outlineStrokeIndex) {
            return false;   
        }
        if (!equalShapes(this.shapeSequence, that.shapeSequence)) {
            return false;
        }
        if (this.shapeIndex != that.shapeIndex) {
            return false;
        }
        return true;

    }
    
    /**
     * A utility method for testing the equality of two arrays of shapes.
     * 
     * @param s1  the first array (<code>null</code> permitted).
     * @param s2  the second array (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    private boolean equalShapes(Shape[] s1, Shape[] s2) {
        if (s1 == null) {
            return s2 == null;   
        }
        if (s2 == null) {
            return false;   
        }
        if (s1.length != s2.length) {
            return false;   
        }
        for (int i = 0; i < s1.length; i++) {
            if (!ShapeUtilities.equal(s1[i], s2[i])) {
                return false;   
            }
        }
        return true;
    }

    /**
     * Handles serialization.
     *
     * @param stream  the output stream.
     *
     * @throws IOException if there is an I/O problem.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();

        int paintCount = this.paintSequence.length;
        stream.writeInt(paintCount);
        for (int i = 0; i < paintCount; i++) {
            SerialUtilities.writePaint(this.paintSequence[i], stream);
        }

        int outlinePaintCount = this.outlinePaintSequence.length;
        stream.writeInt(outlinePaintCount);
        for (int i = 0; i < outlinePaintCount; i++) {
            SerialUtilities.writePaint(this.outlinePaintSequence[i], stream);
        }

        int strokeCount = this.strokeSequence.length;
        stream.writeInt(strokeCount);
        for (int i = 0; i < strokeCount; i++) {
            SerialUtilities.writeStroke(this.strokeSequence[i], stream);
        }

        int outlineStrokeCount = this.outlineStrokeSequence.length;
        stream.writeInt(outlineStrokeCount);
        for (int i = 0; i < outlineStrokeCount; i++) {
            SerialUtilities.writeStroke(this.outlineStrokeSequence[i], stream);
        }

        int shapeCount = this.shapeSequence.length;
        stream.writeInt(shapeCount);
        for (int i = 0; i < shapeCount; i++) {
            SerialUtilities.writeShape(this.shapeSequence[i], stream);
        }

    }

    /**
     * Restores a serialized object.
     *
     * @param stream  the input stream.
     *
     * @throws IOException if there is an I/O problem.
     * @throws ClassNotFoundException if there is a problem loading a class.
     */
    private void readObject(ObjectInputStream stream) 
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();

        int paintCount = stream.readInt();
        this.paintSequence = new Paint[paintCount];
        for (int i = 0; i < paintCount; i++) {
            this.paintSequence[i] = SerialUtilities.readPaint(stream);
        }

        int outlinePaintCount = stream.readInt();
        this.outlinePaintSequence = new Paint[outlinePaintCount];
        for (int i = 0; i < outlinePaintCount; i++) {
            this.outlinePaintSequence[i] = SerialUtilities.readPaint(stream);
        }

        int strokeCount = stream.readInt();
        this.strokeSequence = new Stroke[strokeCount];
        for (int i = 0; i < strokeCount; i++) {
            this.strokeSequence[i] = SerialUtilities.readStroke(stream);
        }

        int outlineStrokeCount = stream.readInt();
        this.outlineStrokeSequence = new Stroke[outlineStrokeCount];
        for (int i = 0; i < outlineStrokeCount; i++) {
            this.outlineStrokeSequence[i] = SerialUtilities.readStroke(stream);
        }

        int shapeCount = stream.readInt();
        this.shapeSequence = new Shape[shapeCount];
        for (int i = 0; i < shapeCount; i++) {
            this.shapeSequence[i] = SerialUtilities.readShape(stream);
        }

    }

    /**
     * Helper method to avoid lots of explicit casts in getShape().  Returns
     * an array containing the provided doubles cast to ints.
     *
     * @param a  x
     * @param b  y
     * @param c  z
     *
     * @return int[3] with converted params.
     */
    private static int[] intArray(double a, double b, double c) {
        return new int[] {(int) a, (int) b, (int) c};
    }

    /**
     * Helper method to avoid lots of explicit casts in getShape().  Returns
     * an array containing the provided doubles cast to ints.
     *
     * @param a  x
     * @param b  y
     * @param c  z
     * @param d  t
     *
     * @return int[4] with converted params.
     */
    private static int[] intArray(double a, double b, double c, double d) {
        return new int[] {(int) a, (int) b, (int) c, (int) d};
    }

    /**
     * Returns a clone.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException if a component of the supplier does 
     *                                    not support cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        DefaultDrawingSupplier clone = (DefaultDrawingSupplier) super.clone(); 
        return clone;
    }
}