org.jfree.chart3d.legend.StandardLegendBuilder Maven / Gradle / Ivy
/* ===========================================================
* Orson Charts : a 3D chart library for the Java(tm) platform
* ===========================================================
*
* (C)opyright 2013-2022, by David Gilbert. All rights reserved.
*
* https://github.com/jfree/orson-charts
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* NOTE: This class is serializable, but the serialization format is subject
* to change in future releases and should not be relied upon for persisting
* instances of this class.
*/
public final class StandardLegendBuilder implements LegendBuilder,
Serializable {
/** An optional header/title for the legend (can be {@code null}). */
private String header;
/** The header alignment (never {@code null}). */
private HAlign headerAlignment;
/** An optional footer for the legend (can be {@code null}). */
private String footer;
/** The footer alignment (never {@code null}). */
private HAlign footerAlignment;
/**
* The row alignment (if {@code null}, the row alignment will be
* derived from the anchor point).
*/
private HAlign rowAlignment;
/**
* The column alignment (if {@code null}, the column alignment will
* be derived from the anchor point).
*/
private VAlign columnAlignment;
/**
* Creates a builder for a simple legend with no header and no footer.
*/
public StandardLegendBuilder() {
this(null, null);
}
/**
* Creates a builder for a simple legend with the specified header and/or
* footer.
*
* @param header the legend header ({@code null} permitted).
* @param footer the legend footer ({@code null} permitted).
*/
public StandardLegendBuilder(String header, String footer) {
this.header = header;
this.headerAlignment = HAlign.LEFT;
this.footer = footer;
this.footerAlignment = HAlign.RIGHT;
this.rowAlignment = null;
this.columnAlignment = null;
}
/**
* Returns the header text.
*
* @return The header text (possibly {@code null}).
*/
public String getHeader() {
return this.header;
}
/**
* Sets the header text.
*
* @param header the header ({@code null} permitted).
*/
public void setHeader(String header) {
this.header = header;
}
/**
* Returns the header alignment.
*
* @return The header alignment (never {@code null}).
*/
public HAlign getHeaderAlignment() {
return this.headerAlignment;
}
/**
* Sets the header alignment.
*
* @param align the header alignment ({@code null} not permitted).
*/
public void setHeaderAlignment(HAlign align) {
Args.nullNotPermitted(align, "align");
this.headerAlignment = align;
}
/**
* Returns the footer text.
*
* @return The footer text (possibly {@code null}).
*/
public String getFooter() {
return this.footer;
}
/**
* Sets the footer text.
*
* @param footer the footer ({@code null} permitted).
*/
public void setFooter(String footer) {
this.footer = footer;
}
/**
* Returns the footer alignment.
*
* @return The footer alignment (never {@code null}).
*/
public HAlign getFooterAlignment() {
return this.footerAlignment;
}
/**
* Sets the footer alignment.
*
* @param align the footer alignment ({@code null} not permitted).
*/
public void setFooterAlignment(HAlign align) {
Args.nullNotPermitted(align, "align");
this.footerAlignment = align;
}
/**
* Returns the row alignment. The default value is {@code null}
* which means that the row alignment is derived from the anchor point
* (left aligned for anchors on the left side, center alignment for
* anchors in the middle, and right aligned for anchors on the right side).
*
* @return The row alignment (possibly {@code null}).
*
* @since 1.1
*/
public HAlign getRowAlignment() {
return this.rowAlignment;
}
/**
* Sets the row alignment (to override the default alignment that is
* derived from the legend anchor point). In most circumstances you
* should be able to rely on the default behaviour, so leave this
* attribute set to {@code null}.
*
* @param alignment the row alignment ({@code null} permitted).
*
* @since 1.1
*/
public void setRowAlignment(HAlign alignment) {
this.rowAlignment = alignment;
}
/**
* Returns the column alignment. The default value is {@code null}
* which means that the column alignment is derived from the anchor point
* (top aligned for anchors at the top, center alignment for
* anchors in the middle, and bottom aligned for anchors at the bottom).
*
* @return The column alignment (possibly {@code null}).
*
* @since 1.1
*/
public VAlign getColumnAlignment() {
return this.columnAlignment;
}
/**
* Sets the column alignment (to override the default alignment that is
* derived from the legend anchor point). In most circumstances you
* should be able to rely on the default behaviour, so leave this
* attribute set to {@code null}.
*
* @param alignment the column alignment ({@code null} permitted).
*
* @since 1.1
*/
public void setColumnAlignment(VAlign alignment) {
this.columnAlignment = alignment;
}
/**
* Creates and returns a legend (instance of {@link TableElement}) that
* provides a visual key for the data series in the specified plot. The
* plot can be any of the built-in plot types: {@link PiePlot3D},
* {@link CategoryPlot3D} or {@link XYZPlot}.
*
* Certain subelements will have the following properties set so that
* downstream code is able to identify which elements relate to particular
* data series: CLASS : 'LegendItem', SERIES_KEY : the series key.
*
* @param plot the plot ({@code null} not permitted).
* @param anchor the anchor ({@code null} not permitted).
* @param orientation the orientation ({@code null} not permitted).
* @param style the chart style ({@code null} not permitted).
*
* @return The legend.
*
* @since 1.2
*/
@Override
public TableElement createLegend(Plot3D plot, Anchor2D anchor,
Orientation orientation, ChartStyle style) {
TableElement legend = createSimpleLegend(plot.getLegendInfo(), anchor,
orientation, style);
if (this.header != null || this.footer != null) {
GridElement compositeLegend = new GridElement<>();
compositeLegend.setBackground(null);
if (header != null) {
TextElement he = new TextElement(this.header,
style.getLegendHeaderFont());
he.setHorizontalAligment(this.headerAlignment);
he.setBackgroundColor(style.getLegendHeaderBackgroundColor());
compositeLegend.setElement(he, "R0", "C1");
}
compositeLegend.setElement(legend, "R1", "C1");
if (this.footer != null) {
TextElement fe = new TextElement(this.footer,
style.getLegendFooterFont());
fe.setHorizontalAligment(this.footerAlignment);
fe.setBackgroundColor(style.getLegendFooterBackgroundColor());
compositeLegend.setElement(fe, "R2", "C1");
}
return compositeLegend;
} else {
return legend;
}
}
/**
* Creates a simple legend based on a flow layout of the individual legend
* items.
*
* @param items the items to be added to the legend ({@code null}
* not permitted).
* @param anchor the anchor point ({@code null} not permitted).
* @param orientation the orientation ({@code null} not permitted).
* @param style the chart style.
*
* @return The simple legend.
*/
private TableElement createSimpleLegend(List items,
Anchor2D anchor, Orientation orientation, ChartStyle style) {
Args.nullNotPermitted(items, "items");
Args.nullNotPermitted(orientation, "orientation");
ContainerElement legend;
if (orientation == Orientation.HORIZONTAL) {
FlowElement fe = new FlowElement(horizontalAlignment(anchor), 2);
fe.setRefPoint(anchor.getRefPt());
legend = fe;
} else {
VerticalFlowElement vfe = new VerticalFlowElement(
verticalAlignment(anchor), 2);
vfe.setRefPoint(anchor.getRefPt());
legend = vfe;
}
for (LegendItemInfo item : items) {
Shape shape = item.getShape();
if (shape == null) {
shape = style.getLegendItemShape();
}
TableElement legendItem = createLegendItem(item.getLabel(),
style.getLegendItemFont(), style.getLegendItemColor(),
shape, item.getColor(),
style.getLegendItemBackgroundColor());
legendItem.setProperty(TableElement.CLASS,
InteractiveElementType.LEGEND_ITEM);
legendItem.setProperty(Chart3D.SERIES_KEY, item.getSeriesKey());
legend.addElement(legendItem);
}
return legend;
}
/**
* Returns the horizontal alignment that should be used.
*
* @param anchor the anchor ({@code null} not permitted).
*
* @return The horizontal alignment.
*/
private HAlign horizontalAlignment(Anchor2D anchor) {
if (this.rowAlignment != null) {
return this.rowAlignment;
}
if (anchor.getRefPt().isLeft()) {
return HAlign.LEFT;
}
if (anchor.getRefPt().isRight()) {
return HAlign.RIGHT;
}
return HAlign.CENTER;
}
/**
* Returns the vertical alignment that should be used.
*
* @param anchor the anchor ({@code null} not permitted).
*
* @return The vertical alignment.
*/
private VAlign verticalAlignment(Anchor2D anchor) {
if (this.columnAlignment != null) {
return this.columnAlignment;
}
if (anchor.getRefPt().isTop()) {
return VAlign.TOP;
}
if (anchor.getRefPt().isBottom()) {
return VAlign.BOTTOM;
}
return VAlign.MIDDLE;
}
/**
* Creates a single item in the legend (normally this represents one
* data series from the dataset).
*
* @param text the legend item text ({@code null} not permitted).
* @param font the font ({@code null} not permitted).
* @param textColor the text color ({@code null} not permitted).
* @param shape the shape ({@code null} not permitted).
* @param shapeColor the shape color ({@code null} not permitted).
* @param background the background color ({@code null} not
* permitted).
*
* @return A legend item (never {@code null}).
*/
private TableElement createLegendItem(String text, Font font,
Color textColor, Shape shape, Color shapeColor, Color background) {
// defer argument checks...
ShapeElement se = new ShapeElement(shape, shapeColor);
se.setBackgroundColor(background);
TextElement te = new TextElement(text, font);
te.setColor(textColor);
te.setBackgroundColor(background);
GridElement ge = new GridElement<>();
ge.setElement(se, "R1", "C1");
ge.setElement(te, "R1", "C2");
return ge;
}
/**
* Tests this legend builder for equality with an arbitrary object.
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof StandardLegendBuilder)) {
return false;
}
StandardLegendBuilder that = (StandardLegendBuilder) obj;
if (!ObjectUtils.equals(this.header, that.header)) {
return false;
}
if (this.headerAlignment != that.headerAlignment) {
return false;
}
if (!ObjectUtils.equals(this.footer, that.footer)) {
return false;
}
if (this.footerAlignment != that.footerAlignment) {
return false;
}
return true;
}
}
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