/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2003-2008, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.renderer.style;

// J2SE dependencies
import java.awt.Composite;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;

import org.geotools.geometry.jts.TransformedShape;
import org.geotools.resources.Classes;


/**
 * Style to represent points as small filled and stroked shapes
 *
 * @author Andrea Aime
 *
 *
 * @source $URL$
 * @version $Id$
 */
public class MarkStyle2D extends PolygonStyle2D implements PointStyle2D {
    
    static boolean maxMarkSizeEnabled = Boolean.getBoolean("org.geotools.maxMarkSizeEnabled");
    
    Shape shape;

    double size;

    float rotation;

    float displacementX;

    float displacementY;

    float anchorPointX = 0.5f;

    float anchorPointY = 0.5f;

    Composite composite;

    /**
     * Returns the shape rotation, in radians
     *
     * @return shape rotation, in radians
     */
    public float getRotation() {
        return rotation;
    }

    /**
     * Returns the shape to be used to render the mark
     *
     */
    public Shape getShape() {
        return shape;
    }

    /**
     * Returns a shape that can be used to draw the mark at the x, y coordinates
     * with appropriated rotation and size (according to the current style)
     *
     * @param x the x coordinate where the mark will be drawn
     * @param y the y coordinate where the mark will be drawn
     *
     * @return a shape that can be used to draw the mark 
     */
    public Shape getTransformedShape(float x, float y) {
        return getTransformedShape(x, y, 0, rotation);
    }
    
    /**
     * Returns a shape that can be used to draw the mark at the x, y coordinates with appropriated
     * rotation and size (according to the current style)
     *
     * @param x the x coordinate where the mark will be drawn
     * @param y the y coordinate where the mark will be drawn
     * @param baseRotation a custom rotation that will be applied before offsets
     * @param rotation the mark rotation
     *
     * @return a shape that can be used to draw the mark
     */
    public Shape getTransformedShape(float x, float y, float baseRotation, float rotation) {
        if (shape != null) {
            Rectangle2D bounds = shape.getBounds2D();
            double shapeSize = (maxMarkSizeEnabled ? Math.max(bounds.getWidth(), bounds.getHeight()) : bounds.getHeight());
            double scale = size / shapeSize;
            TransformedShape ts = new TransformedShape();
            ts.shape = shape;
            // shapes are already centered, we need to displace them only if the anchor is not 0.5 0.5
            float dx = displacementX;
            float dy = displacementY;
            if (baseRotation != 0) {
                ts.translate(x, y);
                ts.rotate(baseRotation);
                ts.translate(dx, dy);
            } else {
                ts.translate(x + dx, y + dy);
            }

            ts.rotate(rotation);
            dx = (float) (bounds.getWidth() * scale * (0.5 - anchorPointX));
            dy = (float) (bounds.getHeight() * scale * (anchorPointY - 0.5));
            ts.translate(dx, dy);
            // flip the symbol to take into account the screen orientation
            // where the y grows from top to bottom
            ts.scale(scale, -scale);

            return ts;
        } else {
            return null;
        }
    }


    /**
     * Returns the size of the shape, in pixels
     *
     */
    public double getSize() {
        return size;
    }

    /**
     * Sets the shape rotation, in radians
     *
     * @param f
     */
    public void setRotation(float f) {
        rotation = f;
    }

    /**
     * Sets the shape to be used to render the mark
     *
     * @param shape
     */
    public void setShape(Shape shape) {
        this.shape = shape;
    }

    /**
     * Sets the size of the shape, in pixels
     *
     * @param i
     */
    public void setSize(double i) {
        size = i;
    }

    /**
     * Returns a string representation of this style.
     */
    public String toString() {
        return Classes.getShortClassName(this) + '[' + shape + ']';
    }

    public static boolean isMaxMarkSizeEnabled() {
        return maxMarkSizeEnabled;
    }

    /**
     * When true makes the mark scale itself to size using the max between the original
     * width and height, otherwise it defaults to the mark height (which has been the
     * original behavior of this class) 
     *  
     * @since 2.7.3
     *  
     * @param useMaxMarkSize
     */
    public static void setMaxMarkSizeEnabled(boolean useMaxMarkSize) {
        MarkStyle2D.maxMarkSizeEnabled = useMaxMarkSize;
    }

    public float getDisplacementX() {
        return displacementX;
    }

    public void setDisplacementX(float displacementX) {
        this.displacementX = displacementX;
    }

    public float getDisplacementY() {
        return displacementY;
    }

    public void setDisplacementY(float displacementY) {
        this.displacementY = displacementY;
    }

    public float getAnchorPointX() {
        return anchorPointX;
    }

    public void setAnchorPointX(float anchorPointX) {
        this.anchorPointX = anchorPointX;
    }

    public float getAnchorPointY() {
        return anchorPointY;
    }

    public void setAnchorPointY(float anchorPointY) {
        this.anchorPointY = anchorPointY;
    }

    public Composite getComposite() {
        return composite;
    }

    public void setComposite(Composite composite) {
        this.composite = composite;
    }

}