/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2021, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * 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; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ---------------------------
 * MinMaxCategoryRenderer.java
 * ---------------------------
 * (C) Copyright 2002-2021, by Object Refinery Limited.
 *
 * Original Author:  Tomer Peretz;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Christian W. Zuckschwerdt;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research
 *                   Center);
 */

package org.jfree.chart.renderer.category;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.awt.geom.Arc2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import javax.swing.Icon;

import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.util.PaintUtils;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.SerialUtils;
import org.jfree.data.category.CategoryDataset;

/**
 * Renderer for drawing min max plot. This renderer draws all the series under
 * the same category in the same x position using {@code objectIcon} and
 * a line from the maximum value to the minimum value. For use with the
 * {@link CategoryPlot} class. The example shown here is generated by
 * the {@code MinMaxCategoryPlotDemo1.java} program included in the
 * JFreeChart Demo Collection:
 * <br><br>
 * <img src="doc-files/MinMaxCategoryRendererSample.png"
 * alt="MinMaxCategoryRendererSample.png">
 */
public class MinMaxCategoryRenderer extends AbstractCategoryItemRenderer {

    /** For serialization. */
    private static final long serialVersionUID = 2935615937671064911L;

    /** A flag indicating whether or not lines are drawn between XY points. */
    private boolean plotLines = false;

    /**
     * The paint of the line between the minimum value and the maximum value.
     */
    private transient Paint groupPaint = Color.BLACK;

    /**
     * The stroke of the line between the minimum value and the maximum value.
     */
    private transient Stroke groupStroke = new BasicStroke(1.0f);

    /** The icon used to indicate the minimum value.*/
    private transient Icon minIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0,
            360, Arc2D.OPEN), null, Color.BLACK);

    /** The icon used to indicate the maximum value.*/
    private transient Icon maxIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0,
            360, Arc2D.OPEN), null, Color.BLACK);

    /** The icon used to indicate the values.*/
    private transient Icon objectIcon = getIcon(new Line2D.Double(-4, 0, 4, 0),
            false, true);

    /** The last category. */
    private int lastCategory = -1;

    /** The minimum. */
    private double min;

    /** The maximum. */
    private double max;

    /**
     * Default constructor.
     */
    public MinMaxCategoryRenderer() {
        super();
    }

    /**
     * Gets whether or not lines are drawn between category points.
     *
     * @return boolean true if line will be drawn between sequenced categories,
     *         otherwise false.
     *
     * @see #setDrawLines(boolean)
     */
    public boolean isDrawLines() {
        return this.plotLines;
    }

    /**
     * Sets the flag that controls whether or not lines are drawn to connect
     * the items within a series and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param draw  the new value of the flag.
     *
     * @see #isDrawLines()
     */
    public void setDrawLines(boolean draw) {
        if (this.plotLines != draw) {
            this.plotLines = draw;
            fireChangeEvent();
        }
    }

    /**
     * Returns the paint used to draw the line between the minimum and maximum
     * value items in each category.
     *
     * @return The paint (never {@code null}).
     *
     * @see #setGroupPaint(Paint)
     */
    public Paint getGroupPaint() {
        return this.groupPaint;
    }

    /**
     * Sets the paint used to draw the line between the minimum and maximum
     * value items in each category and sends a {@link RendererChangeEvent} to
     * all registered listeners.
     *
     * @param paint  the paint ({@code null} not permitted).
     *
     * @see #getGroupPaint()
     */
    public void setGroupPaint(Paint paint) {
        Args.nullNotPermitted(paint, "paint");
        this.groupPaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns the stroke used to draw the line between the minimum and maximum
     * value items in each category.
     *
     * @return The stroke (never {@code null}).
     *
     * @see #setGroupStroke(Stroke)
     */
    public Stroke getGroupStroke() {
        return this.groupStroke;
    }

    /**
     * Sets the stroke of the line between the minimum value and the maximum
     * value and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param stroke the new stroke ({@code null} not permitted).
     */
    public void setGroupStroke(Stroke stroke) {
        Args.nullNotPermitted(stroke, "stroke");
        this.groupStroke = stroke;
        fireChangeEvent();
    }

    /**
     * Returns the icon drawn for each data item.
     *
     * @return The icon (never {@code null}).
     *
     * @see #setObjectIcon(Icon)
     */
    public Icon getObjectIcon() {
        return this.objectIcon;
    }

    /**
     * Sets the icon drawn for each data item and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param icon  the icon.
     *
     * @see #getObjectIcon()
     */
    public void setObjectIcon(Icon icon) {
        Args.nullNotPermitted(icon, "icon");
        this.objectIcon = icon;
        fireChangeEvent();
    }

    /**
     * Returns the icon displayed for the maximum value data item within each
     * category.
     *
     * @return The icon (never {@code null}).
     *
     * @see #setMaxIcon(Icon)
     */
    public Icon getMaxIcon() {
        return this.maxIcon;
    }

    /**
     * Sets the icon displayed for the maximum value data item within each
     * category and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param icon  the icon ({@code null} not permitted).
     *
     * @see #getMaxIcon()
     */
    public void setMaxIcon(Icon icon) {
        Args.nullNotPermitted(icon, "icon");
        this.maxIcon = icon;
        fireChangeEvent();
    }

    /**
     * Returns the icon displayed for the minimum value data item within each
     * category.
     *
     * @return The icon (never {@code null}).
     *
     * @see #setMinIcon(Icon)
     */
    public Icon getMinIcon() {
        return this.minIcon;
    }

    /**
     * Sets the icon displayed for the minimum value data item within each
     * category and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     *
     * @param icon  the icon ({@code null} not permitted).
     *
     * @see #getMinIcon()
     */
    public void setMinIcon(Icon icon) {
        Args.nullNotPermitted(icon, "icon");
        this.minIcon = icon;
        fireChangeEvent();
    }

    /**
     * Draw a single data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the area in which the data is drawn.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param pass  the pass index.
     */
    @Override
    public void drawItem(Graphics2D g2, CategoryItemRendererState state,
            Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,
            ValueAxis rangeAxis, CategoryDataset dataset, int row, int column,
            int pass) {

        // first check the number we are plotting...
        Number value = dataset.getValue(row, column);
        if (value != null) {
            // current data point...
            double x1 = domainAxis.getCategoryMiddle(column, getColumnCount(),
                    dataArea, plot.getDomainAxisEdge());
            double y1 = rangeAxis.valueToJava2D(value.doubleValue(), dataArea,
                    plot.getRangeAxisEdge());
            Shape hotspot = new Rectangle2D.Double(x1 - 4, y1 - 4, 8.0, 8.0);

            g2.setPaint(getItemPaint(row, column));
            g2.setStroke(getItemStroke(row, column));

            PlotOrientation orient = plot.getOrientation();
            if (orient == PlotOrientation.VERTICAL) {
                this.objectIcon.paintIcon(null, g2, (int) x1, (int) y1);
            }
            else {
                this.objectIcon.paintIcon(null, g2, (int) y1, (int) x1);
            }

            if (this.lastCategory == column) {
                if (this.min > value.doubleValue()) {
                    this.min = value.doubleValue();
                }
                if (this.max < value.doubleValue()) {
                    this.max = value.doubleValue();
                }

                // last series, so we are ready to draw the min and max
                if (dataset.getRowCount() - 1 == row) {
                    g2.setPaint(this.groupPaint);
                    g2.setStroke(this.groupStroke);
                    double minY = rangeAxis.valueToJava2D(this.min, dataArea,
                            plot.getRangeAxisEdge());
                    double maxY = rangeAxis.valueToJava2D(this.max, dataArea,
                            plot.getRangeAxisEdge());

                    if (orient == PlotOrientation.VERTICAL) {
                        g2.draw(new Line2D.Double(x1, minY, x1, maxY));
                        this.minIcon.paintIcon(null, g2, (int) x1, (int) minY);
                        this.maxIcon.paintIcon(null, g2, (int) x1, (int) maxY);
                    }
                    else {
                        g2.draw(new Line2D.Double(minY, x1, maxY, x1));
                        this.minIcon.paintIcon(null, g2, (int) minY, (int) x1);
                        this.maxIcon.paintIcon(null, g2, (int) maxY, (int) x1);
                    }
                }
            }
            else {  // reset the min and max
                this.lastCategory = column;
                this.min = value.doubleValue();
                this.max = value.doubleValue();
            }

            // connect to the previous point
            if (this.plotLines) {
                if (column != 0) {
                    Number previousValue = dataset.getValue(row, column - 1);
                    if (previousValue != null) {
                        // previous data point...
                        double previous = previousValue.doubleValue();
                        double x0 = domainAxis.getCategoryMiddle(column - 1,
                                getColumnCount(), dataArea,
                                plot.getDomainAxisEdge());
                        double y0 = rangeAxis.valueToJava2D(previous, dataArea,
                                plot.getRangeAxisEdge());
                        g2.setPaint(getItemPaint(row, column));
                        g2.setStroke(getItemStroke(row, column));
                        Line2D line;
                        if (orient == PlotOrientation.VERTICAL) {
                            line = new Line2D.Double(x0, y0, x1, y1);
                        }
                        else {
                            line = new Line2D.Double(y0, x0, y1, x1);
                        }
                        g2.draw(line);
                    }
                }
            }

            // add an item entity, if this information is being collected
            EntityCollection entities = state.getEntityCollection();
            if (entities != null) {
                addItemEntity(entities, dataset, row, column, hotspot);
            }
        }
    }

    /**
     * Tests this instance for equality with an arbitrary object.  The icon
     * fields are NOT included in the test, so this implementation is a little
     * weak.
     *
     * @param obj  the object ({@code null} permitted).
     *
     * @return A boolean.
     */
    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof MinMaxCategoryRenderer)) {
            return false;
        }
        MinMaxCategoryRenderer that = (MinMaxCategoryRenderer) obj;
        if (this.plotLines != that.plotLines) {
            return false;
        }
        if (!PaintUtils.equal(this.groupPaint, that.groupPaint)) {
            return false;
        }
        if (!this.groupStroke.equals(that.groupStroke)) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns an icon.
     *
     * @param shape  the shape.
     * @param fillPaint  the fill paint.
     * @param outlinePaint  the outline paint.
     *
     * @return The icon.
     */
    private Icon getIcon(Shape shape, final Paint fillPaint, final Paint outlinePaint) {

        final int width = shape.getBounds().width;
        final int height = shape.getBounds().height;
        final GeneralPath path = new GeneralPath(shape);
        return new Icon() {
            @Override
            public void paintIcon(Component c, Graphics g, int x, int y) {
                Graphics2D g2 = (Graphics2D) g;
                path.transform(AffineTransform.getTranslateInstance(x, y));
                if (fillPaint != null) {
                    g2.setPaint(fillPaint);
                    g2.fill(path);
                }
                if (outlinePaint != null) {
                    g2.setPaint(outlinePaint);
                    g2.draw(path);
                }
                path.transform(AffineTransform.getTranslateInstance(-x, -y));
            }

            @Override
            public int getIconWidth() {
                return width;
            }

            @Override
            public int getIconHeight() {
                return height;
            }
        };
    }

    /**
     * Returns an icon from a shape.
     *
     * @param shape  the shape.
     * @param fill  the fill flag.
     * @param outline  the outline flag.
     *
     * @return The icon.
     */
    private Icon getIcon(Shape shape, final boolean fill, final boolean outline) {
        final int width = shape.getBounds().width;
        final int height = shape.getBounds().height;
        final GeneralPath path = new GeneralPath(shape);
        return new Icon() {
            @Override
            public void paintIcon(Component c, Graphics g, int x, int y) {
                Graphics2D g2 = (Graphics2D) g;
                path.transform(AffineTransform.getTranslateInstance(x, y));
                if (fill) {
                    g2.fill(path);
                }
                if (outline) {
                    g2.draw(path);
                }
                path.transform(AffineTransform.getTranslateInstance(-x, -y));
            }

            @Override
            public int getIconWidth() {
                return width;
            }

            @Override
            public int getIconHeight() {
                return height;
            }
        };
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtils.writeStroke(this.groupStroke, stream);
        SerialUtils.writePaint(this.groupPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream)
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.groupStroke = SerialUtils.readStroke(stream);
        this.groupPaint = SerialUtils.readPaint(stream);

        this.minIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360,
                Arc2D.OPEN), null, Color.BLACK);
        this.maxIcon = getIcon(new Arc2D.Double(-4, -4, 8, 8, 0, 360,
                Arc2D.OPEN), null, Color.BLACK);
        this.objectIcon = getIcon(new Line2D.Double(-4, 0, 4, 0), false, true);
    }

}