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POhow to customize the line chart in afreechart library in android
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  1. POhow to customize the line chart in afreechart library in android
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    copied!<p>I have downloaded the <em>AFreeChart</em> library and a sample for it. I have downloaded the zip file using <a href="https://code.google.com/p/afreechart/downloads/list" rel="nofollow">this link</a>.</p> <p>I need to customize the application. By default they are displaying the chart in the complete screen. now i want to create a button below that chart. So please suggest me how to customize the code. </p> <p>The code for the chart is below.</p> <pre class="lang-java prettyprint-override"><code>public class AFreeChart implements Drawable, TitleChangeListener, PlotChangeListener, Serializable, Cloneable { /** For serialization. */ private static final long serialVersionUID = -3470703747817429120L; /** The default font for titles. */ public static final Font DEFAULT_TITLE_FONT = new Font("SansSerif", Typeface.BOLD, 18); /** The default background color. */ public static final PaintType DEFAULT_BACKGROUND_PAINT = new SolidColor( Color.LTGRAY); /** The default background image alignment. */ public static final int DEFAULT_BACKGROUND_IMAGE_ALIGNMENT = Align.FIT; /** The default background image alpha. */ public static final float DEFAULT_BACKGROUND_IMAGE_ALPHA = 0.5f; /** A flag that controls whether or not the chart border is drawn. */ private boolean borderVisible; /** The stroke used to draw the chart border (if visible). */ private transient float borderStroke; /** The paint used to draw the chart border (if visible). */ private transient PaintType borderPaintType; /** The padding between the chart border and the chart drawing area. */ private RectangleInsets padding; /** The chart title (optional). */ private TextTitle title; /** The default border effect. */ public static final PathEffect DEFAULT_BORDER_EFFECT = null; /** The effect used to draw the chart border (if visible). */ private transient PathEffect borderEffect; /** * The chart subtitles (zero, one or many). This field should never be * &lt;code&gt;null&lt;/code&gt;. */ private List subtitles; /** Draws the visual representation of the data. */ private Plot plot; /** Paint used to draw the background of the chart. */ private transient PaintType backgroundPaintType; /** Storage for registered change listeners. */ private transient List&lt;ChartChangeListener&gt; changeListeners; /** Storage for registered progress listeners. */ private transient List&lt;ChartProgressListener&gt; progressListeners; private boolean notify; private Button b; public AFreeChart(String title, Font titleFont, Plot plot, boolean createLegend) { if (plot == null) { throw new NullPointerException("Null 'plot' argument."); } // create storage for listeners... this.progressListeners = new CopyOnWriteArrayList&lt;ChartProgressListener&gt;(); this.changeListeners = new CopyOnWriteArrayList&lt;ChartChangeListener&gt;(); this.notify = true; // default is to notify listeners when the this.borderVisible = true; this.borderStroke = 2; this.borderPaintType = new SolidColor(Color.WHITE); this.borderEffect = DEFAULT_BORDER_EFFECT; this.plot = plot; plot.addChangeListener(this); this.subtitles = new ArrayList(); // create a legend, if requested... if (createLegend) { LegendTitle legend = new LegendTitle(this.plot); legend.setMargin(new RectangleInsets(1.0, 1.0, 1.0, 1.0)); legend.setFrame(new LineBorder()); PaintType paintType = new SolidColor(Color.WHITE); legend.setBackgroundPaintType(paintType); legend.setPosition(RectangleEdge.BOTTOM); this.subtitles.add(legend); legend.addChangeListener(this); } // add the chart title, if one has been specified... if (title != null) { if (titleFont == null) { titleFont = DEFAULT_TITLE_FONT; } this.title = new TextTitle(title, titleFont); this.title.addChangeListener(this); } this.backgroundPaintType = DEFAULT_BACKGROUND_PAINT; } public AFreeChart(String title, Plot plot) { this(title, AFreeChart.DEFAULT_TITLE_FONT, plot, true); } public boolean isBorderVisible() { return this.borderVisible; } public void setBorderVisible(boolean visible) { this.borderVisible = visible; fireChartChanged(); } public float getBorderStroke() { return this.borderStroke; } public void setBorderStroke(float stroke) { this.borderStroke = stroke; fireChartChanged(); } public PaintType getBorderPaintType() { return this.borderPaintType; } public void setBorderPaintType(PaintType paintType) { this.borderPaintType = paintType; fireChartChanged(); } public RectangleInsets getPadding() { return this.padding; } /** * Sets the padding between the chart border and the chart drawing area, and * sends a {@link ChartChangeEvent} to all registered listeners. * * @param padding * the padding (&lt;code&gt;null&lt;/code&gt; not permitted). * * @see #getPadding() */ public void setPadding(RectangleInsets padding) { if (padding == null) { throw new IllegalArgumentException("Null 'padding' argument."); } this.padding = padding; notifyListeners(new ChartChangeEvent(this)); } public TextTitle getTitle() { return this.title; } public void setTitle(TextTitle title) { if (this.title != null) { this.title.removeChangeListener(this); } this.title = title; if (title != null) { title.addChangeListener(this); } fireChartChanged(); } public void setBorderEffect(PathEffect effect) { this.borderEffect = effect; fireChartChanged(); } public void setTitle(String text) { if (text != null) { if (this.title == null) { setTitle(new TextTitle(text, AFreeChart.DEFAULT_TITLE_FONT)); } else { this.title.setText(text); } } else { setTitle((TextTitle) null); } } public void addLegend(LegendTitle legend) { addSubtitle(legend); } public void addSubtitle(Title subtitle) { if (subtitle == null) { throw new IllegalArgumentException("Null 'subtitle' argument."); } this.subtitles.add(subtitle); subtitle.addChangeListener(this); fireChartChanged(); } public void addSubtitle(int index, Title subtitle) { if (index &lt; 0 || index &gt; getSubtitleCount()) { throw new IllegalArgumentException( "The 'index' argument is out of range."); } if (subtitle == null) { throw new IllegalArgumentException("Null 'subtitle' argument."); } this.subtitles.add(index, subtitle); subtitle.addChangeListener(this); fireChartChanged(); } public LegendTitle getLegend() { return getLegend(0); } public LegendTitle getLegend(int index) { int seen = 0; Iterator iterator = this.subtitles.iterator(); while (iterator.hasNext()) { Title subtitle = (Title) iterator.next(); if (subtitle instanceof LegendTitle) { if (seen == index) { return (LegendTitle) subtitle; } else { seen++; } } } return null; } public void removeLegend() { removeSubtitle(getLegend()); } public void removeSubtitle(Title title) { this.subtitles.remove(title); fireChartChanged(); } public List getSubtitles() { return new ArrayList(this.subtitles); } public void setSubtitles(List subtitles) { if (subtitles == null) { throw new NullPointerException("Null 'subtitles' argument."); } // setNotify(false); clearSubtitles(); Iterator iterator = subtitles.iterator(); while (iterator.hasNext()) { Title t = (Title) iterator.next(); if (t != null) { addSubtitle(t); } } } public void clearSubtitles() { Iterator iterator = this.subtitles.iterator(); while (iterator.hasNext()) { Title t = (Title) iterator.next(); t.removeChangeListener(this); } this.subtitles.clear(); fireChartChanged(); } public int getSubtitleCount() { return this.subtitles.size(); } public Title getSubtitle(int index) { if ((index &lt; 0) || (index &gt;= getSubtitleCount())) { throw new IllegalArgumentException("Index out of range."); } return (Title) this.subtitles.get(index); } public Plot getPlot() { return this.plot; } public CategoryPlot getCategoryPlot() { return (CategoryPlot) this.plot; } public XYPlot getXYPlot() { return (XYPlot) this.plot; } public PathEffect getBorderEffect() { return this.borderEffect; } public PaintType getBackgroundPaintType() { return this.backgroundPaintType; } public void setBackgroundPaintType(PaintType paintType) { if (this.backgroundPaintType != null) { if (!this.backgroundPaintType.equals(paintType)) { this.backgroundPaintType = paintType; fireChartChanged(); } } else { if (paintType != null) { this.backgroundPaintType = paintType; fireChartChanged(); } } } public void draw(Canvas canvas, RectShape area) { draw(canvas, area, null, null); } public void draw(Canvas canvas, RectShape area, ChartRenderingInfo info) { draw(canvas, area, null, info); } public void draw(Canvas canvas, RectShape chartArea, PointF anchor, ChartRenderingInfo info) { EntityCollection entities = null; notifyListeners(new ChartProgressEvent(this, this, ChartProgressEvent.DRAWING_STARTED, 0)); // record the chart area, if info is requested... if (info != null) { info.clear(); info.setChartArea(chartArea); entities = info.getEntityCollection(); } if (entities != null) { entities.add(new AFreeChartEntity((RectShape) chartArea.clone(), this)); } Rect savedClip = canvas.getClipBounds(); // ensure no drawing occurs outside chart area... canvas.clipRect((float) chartArea.getMinX(), (float) chartArea.getMinY(), (float) chartArea.getMaxX(), (float) chartArea.getMaxY()); // draw the chart background... if (this.backgroundPaintType != null) { Paint paint = PaintUtility.createPaint(Paint.ANTI_ALIAS_FLAG, this.backgroundPaintType); chartArea.fill(canvas, paint); } if (isBorderVisible()) { PaintType paintType = getBorderPaintType(); if (paintType != null) { RectShape borderArea = new RectShape(chartArea.getX(), chartArea.getY(), chartArea.getWidth() - 1.0, chartArea.getHeight() - 1.0); Paint paint = PaintUtility.createPaint(borderPaintType, borderStroke, borderEffect); borderArea.draw(canvas, paint); } } // draw the title and subtitles... RectShape nonTitleArea = new RectShape(); nonTitleArea.setRect(chartArea); if (this.padding != null) this.padding.trim(nonTitleArea); if (this.title != null) { EntityCollection e = drawTitle(this.title, canvas, nonTitleArea, (entities != null)); if (e != null) { entities.addAll(e); } } Iterator iterator = this.subtitles.iterator(); while (iterator.hasNext()) { Title currentTitle = (Title) iterator.next(); if (currentTitle.isVisible()) { EntityCollection e = drawTitle(currentTitle, canvas, nonTitleArea, (entities != null)); if (e != null) { entities.addAll(e); } } } RectShape plotArea = nonTitleArea; // draw the plot (axes and data visualisation) PlotRenderingInfo plotInfo = null; if (info != null) { plotInfo = info.getPlotInfo(); } this.plot.draw(canvas, plotArea, anchor, null, plotInfo); canvas.clipRect(savedClip, Op.REPLACE); notifyListeners(new ChartProgressEvent(this, this, ChartProgressEvent.DRAWING_FINISHED, 100)); } private RectShape createAlignedRectShape(Size2D dimensions, RectShape frame, HorizontalAlignment hAlign, VerticalAlignment vAlign) { double x = Double.NaN; double y = Double.NaN; if (hAlign == HorizontalAlignment.LEFT) { x = frame.getX(); } else if (hAlign == HorizontalAlignment.CENTER) { x = frame.getCenterX() - (dimensions.width / 2.0); } else if (hAlign == HorizontalAlignment.RIGHT) { x = frame.getMaxX() - dimensions.width; } if (vAlign == VerticalAlignment.TOP) { y = frame.getY(); } else if (vAlign == VerticalAlignment.CENTER) { y = frame.getCenterY() - (dimensions.height / 2.0); } else if (vAlign == VerticalAlignment.BOTTOM) { y = frame.getMaxY() - dimensions.height; } return new RectShape(x, y, dimensions.width, dimensions.height); } protected EntityCollection drawTitle(Title t, Canvas canvas, RectShape area, boolean entities) { if (t == null) { throw new IllegalArgumentException("Null 't' argument."); } if (area == null) { throw new IllegalArgumentException("Null 'area' argument."); } RectShape titleArea = new RectShape(); RectangleEdge position = t.getPosition(); double ww = area.getWidth(); if (ww &lt;= 0.0) { return null; } double hh = area.getHeight(); if (hh &lt;= 0.0) { return null; } RectangleConstraint constraint = new RectangleConstraint(ww, new Range( 0.0, ww), LengthConstraintType.RANGE, hh, new Range(0.0, hh), LengthConstraintType.RANGE); Object retValue = null; BlockParams p = new BlockParams(); p.setGenerateEntities(entities); if (position == RectangleEdge.TOP) { Size2D size = t.arrange(canvas, constraint); titleArea = createAlignedRectShape(size, area, t.getHorizontalAlignment(), VerticalAlignment.TOP); retValue = t.draw(canvas, titleArea, p); area.setRect(area.getX(), Math.min(area.getY() + size.height, area.getMaxY()), area.getWidth(), Math.max(area.getHeight() - size.height, 0)); } else if (position == RectangleEdge.BOTTOM) { Size2D size = t.arrange(canvas, constraint); titleArea = createAlignedRectShape(size, area, t.getHorizontalAlignment(), VerticalAlignment.BOTTOM); retValue = t.draw(canvas, titleArea, p); area.setRect(area.getX(), area.getY(), area.getWidth(), area.getHeight() - size.height); } else if (position == RectangleEdge.RIGHT) { Size2D size = t.arrange(canvas, constraint); titleArea = createAlignedRectShape(size, area, HorizontalAlignment.RIGHT, t.getVerticalAlignment()); retValue = t.draw(canvas, titleArea, p); area.setRect(area.getX(), area.getY(), area.getWidth() - size.width, area.getHeight()); } else if (position == RectangleEdge.LEFT) { Size2D size = t.arrange(canvas, constraint); titleArea = createAlignedRectShape(size, area, HorizontalAlignment.LEFT, t.getVerticalAlignment()); retValue = t.draw(canvas, titleArea, p); area.setRect(area.getX() + size.width, area.getY(), area.getWidth() - size.width, area.getHeight()); } else { throw new RuntimeException("Unrecognised title position."); } EntityCollection result = null; if (retValue instanceof EntityBlockResult) { EntityBlockResult ebr = (EntityBlockResult) retValue; result = ebr.getEntityCollection(); } return result; } public void handleClick(int x, int y, ChartRenderingInfo info) { // pass the click on to the plot... // rely on the plot to post a plot change event and redraw the chart... this.plot.handleClick(x, y, info.getPlotInfo()); } public void addChangeListener(ChartChangeListener listener) { if (listener == null) { throw new IllegalArgumentException("Null 'listener' argument."); } this.changeListeners.add(listener); } public void removeChangeListener(ChartChangeListener listener) { if (listener == null) { throw new IllegalArgumentException("Null 'listener' argument."); } this.changeListeners.remove(listener); } public void fireChartChanged() { ChartChangeEvent event = new ChartChangeEvent(this); notifyListeners(event); } protected void notifyListeners(ChartChangeEvent event) { if (changeListeners.size() == 0) { return; } if (this.notify) { for (int i = changeListeners.size() - 1; i &gt;= 0; i--) { changeListeners.get(i).chartChanged(event); } } } public void addProgressListener(ChartProgressListener listener) { this.progressListeners.add(listener); } public void removeProgressListener(ChartProgressListener listener) { this.progressListeners.remove(listener); } protected void notifyListeners(ChartProgressEvent event) { if (progressListeners.size() == 0) { return; } for (int i = progressListeners.size() - 1; i &gt;= 0; i--) { progressListeners.get(i).chartProgress(event); } } public void titleChanged(TitleChangeEvent event) { event.setChart(this); notifyListeners(event); } public void plotChanged(PlotChangeEvent event) { event.setChart(this); notifyListeners(event); } public Object clone() throws CloneNotSupportedException { AFreeChart chart = (AFreeChart) super.clone(); // chart.renderingHints = (RenderingHints) this.renderingHints.clone(); // private boolean borderVisible; // private transient Stroke borderStroke; // private transient Paint borderPaint; if (this.title != null) { chart.title = (TextTitle) this.title.clone(); chart.title.addChangeListener(chart); } chart.subtitles = new ArrayList(); for (int i = 0; i &lt; getSubtitleCount(); i++) { Title subtitle = (Title) getSubtitle(i).clone(); chart.subtitles.add(subtitle); subtitle.addChangeListener(chart); } if (this.plot != null) { chart.plot = (Plot) this.plot.clone(); chart.plot.addChangeListener(chart); } chart.progressListeners = new CopyOnWriteArrayList&lt;ChartProgressListener&gt;(); chart.changeListeners = new CopyOnWriteArrayList&lt;ChartChangeListener&gt;(); return chart; } public void setNotify(boolean notify) { this.notify = notify; // if the flag is being set to true, there may be queued up changes... if (notify) { notifyListeners(new ChartChangeEvent(this)); } } public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof AFreeChart)) { return false; } AFreeChart that = (AFreeChart) obj; // if (!this.renderingHints.equals(that.renderingHints)) { // return false; // } if (this.borderVisible != that.borderVisible) { return false; } if (!ObjectUtilities.equal(this.borderStroke, that.borderStroke)) { return false; } if (!PaintTypeUtilities.equal(this.borderPaintType, that.borderPaintType)) { return false; } if (!ObjectUtilities.equal(this.title, that.title)) { return false; } if (!ObjectUtilities.equal(this.subtitles, that.subtitles)) { return false; } if (!ObjectUtilities.equal(this.plot, that.plot)) { return false; } if (!PaintTypeUtilities.equal(this.backgroundPaintType, that.backgroundPaintType)) { return false; } if (this.notify != that.notify) { return false; } return true; } } </code></pre>
 

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