candlestickrenderer.html

jfreechart1。0。2的api。

<FONT color="green">421</FONT>    <a name="line.421"></a>
<FONT color="green">422</FONT>        /**<a name="line.422"></a>
<FONT color="green">423</FONT>         * Returns a flag indicating whether or not volume bars are drawn on the<a name="line.423"></a>
<FONT color="green">424</FONT>         * chart.<a name="line.424"></a>
<FONT color="green">425</FONT>         *<a name="line.425"></a>
<FONT color="green">426</FONT>         * @return &lt;code&gt;true&lt;/code&gt; if volume bars are drawn on the chart.<a name="line.426"></a>
<FONT color="green">427</FONT>         */<a name="line.427"></a>
<FONT color="green">428</FONT>        public boolean drawVolume() {<a name="line.428"></a>
<FONT color="green">429</FONT>            return this.drawVolume;<a name="line.429"></a>
<FONT color="green">430</FONT>        }<a name="line.430"></a>
<FONT color="green">431</FONT>    <a name="line.431"></a>
<FONT color="green">432</FONT>        /**<a name="line.432"></a>
<FONT color="green">433</FONT>         * Sets a flag that controls whether or not volume bars are drawn in the<a name="line.433"></a>
<FONT color="green">434</FONT>         * background.<a name="line.434"></a>
<FONT color="green">435</FONT>         *<a name="line.435"></a>
<FONT color="green">436</FONT>         * @param flag The flag.<a name="line.436"></a>
<FONT color="green">437</FONT>         */<a name="line.437"></a>
<FONT color="green">438</FONT>        public void setDrawVolume(boolean flag) {<a name="line.438"></a>
<FONT color="green">439</FONT>            if (this.drawVolume != flag) {<a name="line.439"></a>
<FONT color="green">440</FONT>                this.drawVolume = flag;<a name="line.440"></a>
<FONT color="green">441</FONT>                notifyListeners(new RendererChangeEvent(this));<a name="line.441"></a>
<FONT color="green">442</FONT>            }<a name="line.442"></a>
<FONT color="green">443</FONT>        }<a name="line.443"></a>
<FONT color="green">444</FONT>    <a name="line.444"></a>
<FONT color="green">445</FONT>        /**<a name="line.445"></a>
<FONT color="green">446</FONT>         * Initialises the renderer then returns the number of 'passes' through the<a name="line.446"></a>
<FONT color="green">447</FONT>         * data that the renderer will require (usually just one).  This method <a name="line.447"></a>
<FONT color="green">448</FONT>         * will be called before the first item is rendered, giving the renderer <a name="line.448"></a>
<FONT color="green">449</FONT>         * an opportunity to initialise any state information it wants to maintain.<a name="line.449"></a>
<FONT color="green">450</FONT>         * The renderer can do nothing if it chooses.<a name="line.450"></a>
<FONT color="green">451</FONT>         *<a name="line.451"></a>
<FONT color="green">452</FONT>         * @param g2  the graphics device.<a name="line.452"></a>
<FONT color="green">453</FONT>         * @param dataArea  the area inside the axes.<a name="line.453"></a>
<FONT color="green">454</FONT>         * @param plot  the plot.<a name="line.454"></a>
<FONT color="green">455</FONT>         * @param dataset  the data.<a name="line.455"></a>
<FONT color="green">456</FONT>         * @param info  an optional info collection object to return data back to <a name="line.456"></a>
<FONT color="green">457</FONT>         *              the caller.<a name="line.457"></a>
<FONT color="green">458</FONT>         *<a name="line.458"></a>
<FONT color="green">459</FONT>         * @return The number of passes the renderer requires.<a name="line.459"></a>
<FONT color="green">460</FONT>         */<a name="line.460"></a>
<FONT color="green">461</FONT>        public XYItemRendererState initialise(Graphics2D g2,<a name="line.461"></a>
<FONT color="green">462</FONT>                                              Rectangle2D dataArea,<a name="line.462"></a>
<FONT color="green">463</FONT>                                              XYPlot plot,<a name="line.463"></a>
<FONT color="green">464</FONT>                                              XYDataset dataset,<a name="line.464"></a>
<FONT color="green">465</FONT>                                              PlotRenderingInfo info) {<a name="line.465"></a>
<FONT color="green">466</FONT>              <a name="line.466"></a>
<FONT color="green">467</FONT>            // calculate the maximum allowed candle width from the axis...<a name="line.467"></a>
<FONT color="green">468</FONT>            ValueAxis axis = plot.getDomainAxis();<a name="line.468"></a>
<FONT color="green">469</FONT>            double x1 = axis.getLowerBound();<a name="line.469"></a>
<FONT color="green">470</FONT>            double x2 = x1 + this.maxCandleWidthInMilliseconds;<a name="line.470"></a>
<FONT color="green">471</FONT>            RectangleEdge edge = plot.getDomainAxisEdge();<a name="line.471"></a>
<FONT color="green">472</FONT>            double xx1 = axis.valueToJava2D(x1, dataArea, edge);<a name="line.472"></a>
<FONT color="green">473</FONT>            double xx2 = axis.valueToJava2D(x2, dataArea, edge);<a name="line.473"></a>
<FONT color="green">474</FONT>            this.maxCandleWidth = Math.abs(xx2 - xx1); <a name="line.474"></a>
<FONT color="green">475</FONT>                // Absolute value, since the relative x <a name="line.475"></a>
<FONT color="green">476</FONT>                // positions are reversed for horizontal orientation<a name="line.476"></a>
<FONT color="green">477</FONT>            <a name="line.477"></a>
<FONT color="green">478</FONT>            // calculate the highest volume in the dataset... <a name="line.478"></a>
<FONT color="green">479</FONT>            if (this.drawVolume) {<a name="line.479"></a>
<FONT color="green">480</FONT>                OHLCDataset highLowDataset = (OHLCDataset) dataset;<a name="line.480"></a>
<FONT color="green">481</FONT>                this.maxVolume = 0.0;<a name="line.481"></a>
<FONT color="green">482</FONT>                for (int series = 0; series &lt; highLowDataset.getSeriesCount(); <a name="line.482"></a>
<FONT color="green">483</FONT>                     series++) {<a name="line.483"></a>
<FONT color="green">484</FONT>                    for (int item = 0; item &lt; highLowDataset.getItemCount(series); <a name="line.484"></a>
<FONT color="green">485</FONT>                         item++) {<a name="line.485"></a>
<FONT color="green">486</FONT>                        double volume = highLowDataset.getVolumeValue(series, item);<a name="line.486"></a>
<FONT color="green">487</FONT>                        if (volume &gt; this.maxVolume) {<a name="line.487"></a>
<FONT color="green">488</FONT>                            this.maxVolume = volume;<a name="line.488"></a>
<FONT color="green">489</FONT>                        }<a name="line.489"></a>
<FONT color="green">490</FONT>                        <a name="line.490"></a>
<FONT color="green">491</FONT>                    }    <a name="line.491"></a>
<FONT color="green">492</FONT>                }<a name="line.492"></a>
<FONT color="green">493</FONT>            }<a name="line.493"></a>
<FONT color="green">494</FONT>            <a name="line.494"></a>
<FONT color="green">495</FONT>            return new XYItemRendererState(info);<a name="line.495"></a>
<FONT color="green">496</FONT>        }<a name="line.496"></a>
<FONT color="green">497</FONT>    <a name="line.497"></a>
<FONT color="green">498</FONT>        /**<a name="line.498"></a>
<FONT color="green">499</FONT>         * Draws the visual representation of a single data item.<a name="line.499"></a>
<FONT color="green">500</FONT>         *<a name="line.500"></a>
<FONT color="green">501</FONT>         * @param g2  the graphics device.<a name="line.501"></a>
<FONT color="green">502</FONT>         * @param state  the renderer state.<a name="line.502"></a>
<FONT color="green">503</FONT>         * @param dataArea  the area within which the plot is being drawn.<a name="line.503"></a>
<FONT color="green">504</FONT>         * @param info  collects info about the drawing.<a name="line.504"></a>
<FONT color="green">505</FONT>         * @param plot  the plot (can be used to obtain standard color <a name="line.505"></a>
<FONT color="green">506</FONT>         *              information etc).<a name="line.506"></a>
<FONT color="green">507</FONT>         * @param domainAxis  the domain axis.<a name="line.507"></a>
<FONT color="green">508</FONT>         * @param rangeAxis  the range axis.<a name="line.508"></a>
<FONT color="green">509</FONT>         * @param dataset  the dataset.<a name="line.509"></a>
<FONT color="green">510</FONT>         * @param series  the series index (zero-based).<a name="line.510"></a>
<FONT color="green">511</FONT>         * @param item  the item index (zero-based).<a name="line.511"></a>
<FONT color="green">512</FONT>         * @param crosshairState  crosshair information for the plot <a name="line.512"></a>
<FONT color="green">513</FONT>         *                        (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.513"></a>
<FONT color="green">514</FONT>         * @param pass  the pass index.<a name="line.514"></a>
<FONT color="green">515</FONT>         */<a name="line.515"></a>
<FONT color="green">516</FONT>        public void drawItem(Graphics2D g2, <a name="line.516"></a>
<FONT color="green">517</FONT>                             XYItemRendererState state,<a name="line.517"></a>
<FONT color="green">518</FONT>                             Rectangle2D dataArea,<a name="line.518"></a>
<FONT color="green">519</FONT>                             PlotRenderingInfo info,<a name="line.519"></a>
<FONT color="green">520</FONT>                             XYPlot plot, <a name="line.520"></a>
<FONT color="green">521</FONT>                             ValueAxis domainAxis, <a name="line.521"></a>
<FONT color="green">522</FONT>                             ValueAxis rangeAxis,<a name="line.522"></a>
<FONT color="green">523</FONT>                             XYDataset dataset, <a name="line.523"></a>
<FONT color="green">524</FONT>                             int series, <a name="line.524"></a>
<FONT color="green">525</FONT>                             int item,<a name="line.525"></a>
<FONT color="green">526</FONT>                             CrosshairState crosshairState,<a name="line.526"></a>
<FONT color="green">527</FONT>                             int pass) {<a name="line.527"></a>
<FONT color="green">528</FONT>    <a name="line.528"></a>
<FONT color="green">529</FONT>            boolean horiz;<a name="line.529"></a>
<FONT color="green">530</FONT>            PlotOrientation orientation = plot.getOrientation();<a name="line.530"></a>
<FONT color="green">531</FONT>            if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.531"></a>
<FONT color="green">532</FONT>                horiz = true;<a name="line.532"></a>
<FONT color="green">533</FONT>            }<a name="line.533"></a>
<FONT color="green">534</FONT>            else if (orientation == PlotOrientation.VERTICAL) {<a name="line.534"></a>
<FONT color="green">535</FONT>                horiz = false;<a name="line.535"></a>
<FONT color="green">536</FONT>            }<a name="line.536"></a>
<FONT color="green">537</FONT>            else {<a name="line.537"></a>
<FONT color="green">538</FONT>                return;<a name="line.538"></a>
<FONT color="green">539</FONT>            }<a name="line.539"></a>
<FONT color="green">540</FONT>            <a name="line.540"></a>
<FONT color="green">541</FONT>            // setup for collecting optional entity info...<a name="line.541"></a>
<FONT color="green">542</FONT>            EntityCollection entities = null;<a name="line.542"></a>
<FONT color="green">543</FONT>            if (info != null) {<a name="line.543"></a>
<FONT color="green">544</FONT>                entities = info.getOwner().getEntityCollection();<a name="line.544"></a>
<FONT color="green">545</FONT>            }<a name="line.545"></a>
<FONT color="green">546</FONT>    <a name="line.546"></a>
<FONT color="green">547</FONT>            OHLCDataset highLowData = (OHLCDataset) dataset;<a name="line.547"></a>
<FONT color="green">548</FONT>    <a name="line.548"></a>
<FONT color="green">549</FONT>            double x = highLowData.getXValue(series, item);<a name="line.549"></a>
<FONT color="green">550</FONT>            double yHigh = highLowData.getHighValue(series, item);<a name="line.550"></a>
<FONT color="green">551</FONT>            double yLow = highLowData.getLowValue(series, item);<a name="line.551"></a>
<FONT color="green">552</FONT>            double yOpen = highLowData.getOpenValue(series, item);<a name="line.552"></a>
<FONT color="green">553</FONT>            double yClose = highLowData.getCloseValue(series, item);<a name="line.553"></a>
<FONT color="green">554</FONT>    <a name="line.554"></a>
<FONT color="green">555</FONT>            RectangleEdge domainEdge = plot.getDomainAxisEdge();<a name="line.555"></a>
<FONT color="green">556</FONT>            double xx = domainAxis.valueToJava2D(x, dataArea, domainEdge);<a name="line.556"></a>
<FONT color="green">557</FONT>    <a name="line.557"></a>
<FONT color="green">558</FONT>            RectangleEdge edge = plot.getRangeAxisEdge();<a name="line.558"></a>
<FONT color="green">559</FONT>            double yyHigh = rangeAxis.valueToJava2D(yHigh, dataArea, edge);<a name="line.559"></a>
<FONT color="green">560</FONT>            double yyLow = rangeAxis.valueToJava2D(yLow, dataArea, edge);<a name="line.560"></a>
<FONT color="green">561</FONT>            double yyOpen = rangeAxis.valueToJava2D(yOpen, dataArea, edge);<a name="line.561"></a>