borderarrangement.java

JFreeChart它主要是用来制作各种各样的图表

     * @return The container size after arranging the contents.
     */
    protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
                               double width) {
        double[] w = new double[5];
        double[] h = new double[5];
        RectangleConstraint c1 = new RectangleConstraint(
            width, null, LengthConstraintType.FIXED,
            0.0, null, LengthConstraintType.NONE
        );
        if (this.topBlock != null) {
            Size2D size = this.topBlock.arrange(g2, c1);
            w[0] = size.width;
            h[0] = size.height;
        }
        if (this.bottomBlock != null) {
            Size2D size = this.bottomBlock.arrange(g2, c1);
            w[1] = size.width;
            h[1] = size.height;
        }
        RectangleConstraint c2 = new RectangleConstraint(
            0.0, new Range(0.0, width), LengthConstraintType.RANGE,
            0.0, null, LengthConstraintType.NONE
        );
        if (this.leftBlock != null) {
            Size2D size = this.leftBlock.arrange(g2, c2);
            w[2] = size.width;
            h[2] = size.height;
        }
        if (this.rightBlock != null) {
            double maxW = Math.max(width - w[2], 0.0);
            RectangleConstraint c3 = new RectangleConstraint(
                0.0, new Range(Math.min(w[2], maxW), maxW), 
                LengthConstraintType.RANGE,
                0.0, null, LengthConstraintType.NONE
            );    
            Size2D size = this.rightBlock.arrange(g2, c3);
            w[3] = size.width;
            h[3] = size.height;
        }
        
        h[2] = Math.max(h[2], h[3]);
        h[3] = h[2];
        
        if (this.centerBlock != null) {
            RectangleConstraint c4 = new RectangleConstraint(
                width - w[2] - w[3], null, LengthConstraintType.FIXED,
                0.0, null, LengthConstraintType.NONE
            );    
            Size2D size = this.centerBlock.arrange(g2, c4);
            w[4] = size.width;
            h[4] = size.height;
        }
        double height = h[0] + h[1] + Math.max(h[2], Math.max(h[3], h[4]));
        return arrange(container, g2, new RectangleConstraint(width, height));
    }

    /**
     * Performs an arrangement with range constraints on both the vertical 
     * and horizontal sides.
     * 
     * @param container  the container.
     * @param widthRange  the allowable range for the container width.
     * @param heightRange  the allowable range for the container height.
     * @param g2  the graphics device.
     * 
     * @return The container size.
     */
    protected Size2D arrangeRR(BlockContainer container, 
                               Range widthRange, Range heightRange, 
                               Graphics2D g2) {
        double[] w = new double[5];
        double[] h = new double[5];
        if (this.topBlock != null) {
            RectangleConstraint c1 = new RectangleConstraint(
                widthRange, heightRange
            );
            Size2D size = this.topBlock.arrange(g2, c1);
            w[0] = size.width;
            h[0] = size.height;
        }
        if (this.bottomBlock != null) {
            Range heightRange2 = Range.shift(heightRange, -h[0], false);
            RectangleConstraint c2 = new RectangleConstraint(
                widthRange, heightRange2
            );  
            Size2D size = this.bottomBlock.arrange(g2, c2);
            w[1] = size.width;
            h[1] = size.height;
        }
        Range heightRange3 = Range.shift(heightRange, -(h[0] + h[1]));
        if (this.leftBlock != null) {
            RectangleConstraint c3 = new RectangleConstraint(
                widthRange, heightRange3
            );
            Size2D size = this.leftBlock.arrange(g2, c3);
            w[2] = size.width;
            h[2] = size.height;
        }
        Range widthRange2 = Range.shift(widthRange, -w[2], false);
        if (this.rightBlock != null) {
            RectangleConstraint c4 = new RectangleConstraint(
                widthRange2, heightRange3
            );
            Size2D size = this.rightBlock.arrange(g2, c4);
            w[3] = size.width;
            h[3] = size.height;
        }
        
        h[2] = Math.max(h[2], h[3]);
        h[3] = h[2];
        Range widthRange3 = Range.shift(widthRange, -(w[2] + w[3]), false);
        if (this.centerBlock != null) {
            RectangleConstraint c5 = new RectangleConstraint(
                widthRange3, heightRange3
            );
            // TODO:  the width and height ranges should be reduced by the 
            // height required for the top and bottom, and the width required
            // by the left and right 
            Size2D size = this.centerBlock.arrange(g2, c5);
            w[4] = size.width;
            h[4] = size.height;
        }
        double width = Math.max(w[0], Math.max(w[1], w[2] + w[4] + w[3]));
        double height = h[0] + h[1] + Math.max(h[2], Math.max(h[3], h[4]));
        if (this.topBlock != null) {
            this.topBlock.setBounds(
                new Rectangle2D.Double(0.0, 0.0, width, h[0])
            );
        }
        if (this.bottomBlock != null) {
            this.bottomBlock.setBounds(
                new Rectangle2D.Double(0.0, height - h[1], width, h[1])
            );
        }
        if (this.leftBlock != null) {
            this.leftBlock.setBounds(
                new Rectangle2D.Double(0.0, h[0], w[2], h[2])
            );
        }
        if (this.rightBlock != null) {
            this.rightBlock.setBounds(
                new Rectangle2D.Double(width - w[3], h[0], w[3], h[3])
            );
        }
        
        if (this.centerBlock != null) {
            this.centerBlock.setBounds(
                new Rectangle2D.Double(
                    w[2], h[0], width - w[2] - w[3], height - h[0] - h[1]
                )
            );
        }
        return new Size2D(width, height);
    }

    /**
     * Arranges the items within a container.
     * 
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     * 
     * @return The container size after the arrangement.
     */
    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        double[] w = new double[5];
        double[] h = new double[5];
        w[0] = constraint.getWidth();
        if (this.topBlock != null) {
            RectangleConstraint c1 = new RectangleConstraint(
                w[0], null, LengthConstraintType.FIXED,
                0.0, new Range(0.0, constraint.getHeight()), 
                LengthConstraintType.RANGE
            );
            Size2D size = this.topBlock.arrange(g2, c1);
            h[0] = size.height;
        }
        w[1] = w[0];
        if (this.bottomBlock != null) {
            RectangleConstraint c2 = new RectangleConstraint(
                w[0], null, LengthConstraintType.FIXED,
                0.0, new Range(0.0, constraint.getHeight() - h[0]), 
                LengthConstraintType.RANGE
            );
            Size2D size = this.bottomBlock.arrange(g2, c2);
            h[1] = size.height;
        }
        h[2] = constraint.getHeight() - h[1] - h[0];
        if (this.leftBlock != null) {
            RectangleConstraint c3 = new RectangleConstraint(
                0.0, new Range(0.0, constraint.getWidth()), 
                LengthConstraintType.RANGE,
                h[2], null, LengthConstraintType.FIXED
            );
            Size2D size = this.leftBlock.arrange(g2, c3);
            w[2] = size.width;            
        }
        h[3] = h[2];
        if (this.rightBlock != null) {
            RectangleConstraint c4 = new RectangleConstraint(
                0.0, new Range(0.0, constraint.getWidth() - w[2]), 
                LengthConstraintType.RANGE,
                h[2], null, LengthConstraintType.FIXED
            );
            Size2D size = this.rightBlock.arrange(g2, c4);
            w[3] = size.width;            
        }
        h[4] = h[2];
        w[4] = constraint.getWidth() - w[3] - w[2];
        RectangleConstraint c5 = new RectangleConstraint(w[4], h[4]);
        if (this.centerBlock != null) {
            this.centerBlock.arrange(g2, c5);   
        }
       
        if (this.topBlock != null) {
            this.topBlock.setBounds(
                new Rectangle2D.Double(0.0, 0.0, w[0], h[0])
            );
        }
        if (this.bottomBlock != null) {
            this.bottomBlock.setBounds(
                new Rectangle2D.Double(0.0, h[0] + h[2], w[1], h[1])
            );
        }
        if (this.leftBlock != null) {
            this.leftBlock.setBounds(
                new Rectangle2D.Double(0.0, h[0], w[2], h[2])
            );
        }
        if (this.rightBlock != null) {
            this.rightBlock.setBounds(
                new Rectangle2D.Double(w[2] + w[4], h[0], w[3], h[3])
            );
        }
        if (this.centerBlock != null) {
            this.centerBlock.setBounds(
                new Rectangle2D.Double(w[2], h[0], w[4], h[4])
            );
        }
        return new Size2D(constraint.getWidth(), constraint.getHeight());
    }
    
    /**
     * Clears the layout.
     */
    public void clear() {
        this.centerBlock = null;
        this.topBlock = null;
        this.bottomBlock = null;
        this.leftBlock = null;
        this.rightBlock = null;
    }
    
    /**
     * Tests this arrangement for equality with an arbitrary 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 BorderArrangement)) {
            return false;   
        }
        BorderArrangement that = (BorderArrangement) obj;
        if (!ObjectUtilities.equal(this.topBlock, that.topBlock)) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.bottomBlock, that.bottomBlock)) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.leftBlock, that.leftBlock)) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.rightBlock, that.rightBlock)) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.centerBlock, that.centerBlock)) {
            return false;   
        }
        return true;
    }
}