stackedbarrenderer.html

jfreechart1。0。2的api。

<FONT color="green">158</FONT>            setBasePositiveItemLabelPosition(p);<a name="line.158"></a>
<FONT color="green">159</FONT>            setBaseNegativeItemLabelPosition(p);<a name="line.159"></a>
<FONT color="green">160</FONT>            setPositiveItemLabelPositionFallback(null);<a name="line.160"></a>
<FONT color="green">161</FONT>            setNegativeItemLabelPositionFallback(null);<a name="line.161"></a>
<FONT color="green">162</FONT>        }<a name="line.162"></a>
<FONT color="green">163</FONT>    <a name="line.163"></a>
<FONT color="green">164</FONT>        /**<a name="line.164"></a>
<FONT color="green">165</FONT>         * Returns &lt;code&gt;true&lt;/code&gt; if the renderer displays each item value as<a name="line.165"></a>
<FONT color="green">166</FONT>         * a percentage (so that the stacked bars add to 100%), and <a name="line.166"></a>
<FONT color="green">167</FONT>         * &lt;code&gt;false&lt;/code&gt; otherwise.<a name="line.167"></a>
<FONT color="green">168</FONT>         * <a name="line.168"></a>
<FONT color="green">169</FONT>         * @return A boolean.<a name="line.169"></a>
<FONT color="green">170</FONT>         */<a name="line.170"></a>
<FONT color="green">171</FONT>        public boolean getRenderAsPercentages() {<a name="line.171"></a>
<FONT color="green">172</FONT>            return this.renderAsPercentages;   <a name="line.172"></a>
<FONT color="green">173</FONT>        }<a name="line.173"></a>
<FONT color="green">174</FONT>        <a name="line.174"></a>
<FONT color="green">175</FONT>        /**<a name="line.175"></a>
<FONT color="green">176</FONT>         * Sets the flag that controls whether the renderer displays each item<a name="line.176"></a>
<FONT color="green">177</FONT>         * value as a percentage (so that the stacked bars add to 100%), and sends<a name="line.177"></a>
<FONT color="green">178</FONT>         * a {@link RendererChangeEvent} to all registered listeners.<a name="line.178"></a>
<FONT color="green">179</FONT>         * <a name="line.179"></a>
<FONT color="green">180</FONT>         * @param asPercentages  the flag.<a name="line.180"></a>
<FONT color="green">181</FONT>         */<a name="line.181"></a>
<FONT color="green">182</FONT>        public void setRenderAsPercentages(boolean asPercentages) {<a name="line.182"></a>
<FONT color="green">183</FONT>            this.renderAsPercentages = asPercentages; <a name="line.183"></a>
<FONT color="green">184</FONT>            notifyListeners(new RendererChangeEvent(this));<a name="line.184"></a>
<FONT color="green">185</FONT>        }<a name="line.185"></a>
<FONT color="green">186</FONT>        <a name="line.186"></a>
<FONT color="green">187</FONT>        /**<a name="line.187"></a>
<FONT color="green">188</FONT>         * Returns the number of passes (&lt;code&gt;2&lt;/code&gt;) required by this renderer. <a name="line.188"></a>
<FONT color="green">189</FONT>         * The first pass is used to draw the bars, the second pass is used to<a name="line.189"></a>
<FONT color="green">190</FONT>         * draw the item labels (if visible).<a name="line.190"></a>
<FONT color="green">191</FONT>         * <a name="line.191"></a>
<FONT color="green">192</FONT>         * @return The number of passes required by the renderer.<a name="line.192"></a>
<FONT color="green">193</FONT>         */<a name="line.193"></a>
<FONT color="green">194</FONT>        public int getPassCount() {<a name="line.194"></a>
<FONT color="green">195</FONT>            return 2;<a name="line.195"></a>
<FONT color="green">196</FONT>        }<a name="line.196"></a>
<FONT color="green">197</FONT>        <a name="line.197"></a>
<FONT color="green">198</FONT>        /**<a name="line.198"></a>
<FONT color="green">199</FONT>         * Returns the range of values the renderer requires to display all the<a name="line.199"></a>
<FONT color="green">200</FONT>         * items from the specified dataset.<a name="line.200"></a>
<FONT color="green">201</FONT>         * <a name="line.201"></a>
<FONT color="green">202</FONT>         * @param dataset  the dataset (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.202"></a>
<FONT color="green">203</FONT>         * <a name="line.203"></a>
<FONT color="green">204</FONT>         * @return The range (or &lt;code&gt;null&lt;/code&gt; if the dataset is empty).<a name="line.204"></a>
<FONT color="green">205</FONT>         */<a name="line.205"></a>
<FONT color="green">206</FONT>        public Range findRangeBounds(CategoryDataset dataset) {<a name="line.206"></a>
<FONT color="green">207</FONT>            if (this.renderAsPercentages) {<a name="line.207"></a>
<FONT color="green">208</FONT>                return new Range(0.0, 1.0);   <a name="line.208"></a>
<FONT color="green">209</FONT>            }<a name="line.209"></a>
<FONT color="green">210</FONT>            else {<a name="line.210"></a>
<FONT color="green">211</FONT>                return DatasetUtilities.findStackedRangeBounds(dataset, getBase());<a name="line.211"></a>
<FONT color="green">212</FONT>            }<a name="line.212"></a>
<FONT color="green">213</FONT>        }<a name="line.213"></a>
<FONT color="green">214</FONT>    <a name="line.214"></a>
<FONT color="green">215</FONT>        /**<a name="line.215"></a>
<FONT color="green">216</FONT>         * Calculates the bar width and stores it in the renderer state.<a name="line.216"></a>
<FONT color="green">217</FONT>         * <a name="line.217"></a>
<FONT color="green">218</FONT>         * @param plot  the plot.<a name="line.218"></a>
<FONT color="green">219</FONT>         * @param dataArea  the data area.<a name="line.219"></a>
<FONT color="green">220</FONT>         * @param rendererIndex  the renderer index.<a name="line.220"></a>
<FONT color="green">221</FONT>         * @param state  the renderer state.<a name="line.221"></a>
<FONT color="green">222</FONT>         */<a name="line.222"></a>
<FONT color="green">223</FONT>        protected void calculateBarWidth(CategoryPlot plot, <a name="line.223"></a>
<FONT color="green">224</FONT>                                         Rectangle2D dataArea, <a name="line.224"></a>
<FONT color="green">225</FONT>                                         int rendererIndex,<a name="line.225"></a>
<FONT color="green">226</FONT>                                         CategoryItemRendererState state) {<a name="line.226"></a>
<FONT color="green">227</FONT>    <a name="line.227"></a>
<FONT color="green">228</FONT>            // calculate the bar width<a name="line.228"></a>
<FONT color="green">229</FONT>            CategoryAxis xAxis = plot.getDomainAxisForDataset(rendererIndex);<a name="line.229"></a>
<FONT color="green">230</FONT>            CategoryDataset data = plot.getDataset(rendererIndex);<a name="line.230"></a>
<FONT color="green">231</FONT>            if (data != null) {<a name="line.231"></a>
<FONT color="green">232</FONT>                PlotOrientation orientation = plot.getOrientation();<a name="line.232"></a>
<FONT color="green">233</FONT>                double space = 0.0;<a name="line.233"></a>
<FONT color="green">234</FONT>                if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.234"></a>
<FONT color="green">235</FONT>                    space = dataArea.getHeight();<a name="line.235"></a>
<FONT color="green">236</FONT>                }<a name="line.236"></a>
<FONT color="green">237</FONT>                else if (orientation == PlotOrientation.VERTICAL) {<a name="line.237"></a>
<FONT color="green">238</FONT>                    space = dataArea.getWidth();<a name="line.238"></a>
<FONT color="green">239</FONT>                }<a name="line.239"></a>
<FONT color="green">240</FONT>                double maxWidth = space * getMaximumBarWidth();<a name="line.240"></a>
<FONT color="green">241</FONT>                int columns = data.getColumnCount();<a name="line.241"></a>
<FONT color="green">242</FONT>                double categoryMargin = 0.0;<a name="line.242"></a>
<FONT color="green">243</FONT>                if (columns &gt; 1) {<a name="line.243"></a>
<FONT color="green">244</FONT>                    categoryMargin = xAxis.getCategoryMargin();<a name="line.244"></a>
<FONT color="green">245</FONT>                }<a name="line.245"></a>
<FONT color="green">246</FONT>    <a name="line.246"></a>
<FONT color="green">247</FONT>                double used = space * (1 - xAxis.getLowerMargin() <a name="line.247"></a>
<FONT color="green">248</FONT>                                         - xAxis.getUpperMargin()<a name="line.248"></a>
<FONT color="green">249</FONT>                                         - categoryMargin);<a name="line.249"></a>
<FONT color="green">250</FONT>                if (columns &gt; 0) {<a name="line.250"></a>
<FONT color="green">251</FONT>                    state.setBarWidth(Math.min(used / columns, maxWidth));<a name="line.251"></a>
<FONT color="green">252</FONT>                }<a name="line.252"></a>
<FONT color="green">253</FONT>                else {<a name="line.253"></a>
<FONT color="green">254</FONT>                    state.setBarWidth(Math.min(used, maxWidth));<a name="line.254"></a>
<FONT color="green">255</FONT>                }<a name="line.255"></a>
<FONT color="green">256</FONT>            }<a name="line.256"></a>
<FONT color="green">257</FONT>    <a name="line.257"></a>
<FONT color="green">258</FONT>        }<a name="line.258"></a>
<FONT color="green">259</FONT>    <a name="line.259"></a>
<FONT color="green">260</FONT>        /**<a name="line.260"></a>
<FONT color="green">261</FONT>         * Draws a stacked bar for a specific item.<a name="line.261"></a>
<FONT color="green">262</FONT>         *<a name="line.262"></a>
<FONT color="green">263</FONT>         * @param g2  the graphics device.<a name="line.263"></a>
<FONT color="green">264</FONT>         * @param state  the renderer state.<a name="line.264"></a>
<FONT color="green">265</FONT>         * @param dataArea  the plot area.<a name="line.265"></a>
<FONT color="green">266</FONT>         * @param plot  the plot.<a name="line.266"></a>
<FONT color="green">267</FONT>         * @param domainAxis  the domain (category) axis.<a name="line.267"></a>
<FONT color="green">268</FONT>         * @param rangeAxis  the range (value) axis.<a name="line.268"></a>
<FONT color="green">269</FONT>         * @param dataset  the data.<a name="line.269"></a>
<FONT color="green">270</FONT>         * @param row  the row index (zero-based).<a name="line.270"></a>
<FONT color="green">271</FONT>         * @param column  the column index (zero-based).<a name="line.271"></a>
<FONT color="green">272</FONT>         * @param pass  the pass index.<a name="line.272"></a>
<FONT color="green">273</FONT>         */<a name="line.273"></a>
<FONT color="green">274</FONT>        public void drawItem(Graphics2D g2,<a name="line.274"></a>
<FONT color="green">275</FONT>                             CategoryItemRendererState state,<a name="line.275"></a>
<FONT color="green">276</FONT>                             Rectangle2D dataArea,<a name="line.276"></a>
<FONT color="green">277</FONT>                             CategoryPlot plot,<a name="line.277"></a>
<FONT color="green">278</FONT>                             CategoryAxis domainAxis,<a name="line.278"></a>
<FONT color="green">279</FONT>                             ValueAxis rangeAxis,<a name="line.279"></a>
<FONT color="green">280</FONT>                             CategoryDataset dataset,<a name="line.280"></a>
<FONT color="green">281</FONT>                             int row,<a name="line.281"></a>
<FONT color="green">282</FONT>                             int column,<a name="line.282"></a>
<FONT color="green">283</FONT>                             int pass) {<a name="line.283"></a>
<FONT color="green">284</FONT>         <a name="line.284"></a>
<FONT color="green">285</FONT>            // nothing is drawn for null values...<a name="line.285"></a>
<FONT color="green">286</FONT>            Number dataValue = dataset.getValue(row, column);<a name="line.286"></a>
<FONT color="green">287</FONT>            if (dataValue == null) {<a name="line.287"></a>
<FONT color="green">288</FONT>                return;<a name="line.288"></a>
<FONT color="green">289</FONT>            }<a name="line.289"></a>
<FONT color="green">290</FONT>            <a name="line.290"></a>
<FONT color="green">291</FONT>            double value = dataValue.doubleValue();<a name="line.291"></a>
<FONT color="green">292</FONT>            double total = 0.0;  // only needed if calculating percentages<a name="line.292"></a>
<FONT color="green">293</FONT>            if (this.renderAsPercentages) {<a name="line.293"></a>
<FONT color="green">294</FONT>                total = DataUtilities.calculateColumnTotal(dataset, column);<a name="line.294"></a>
<FONT color="green">295</FONT>                value = value / total;<a name="line.295"></a>
<FONT color="green">296</FONT>            }<a name="line.296"></a>
<FONT color="green">297</FONT>            <a name="line.297"></a>
<FONT color="green">298</FONT>            PlotOrientation orientation = plot.getOrientation();<a name="line.298"></a>
<FONT color="green">299</FONT>            double barW0 = domainAxis.getCategoryMiddle(<a name="line.299"></a>
<FONT color="green">300</FONT>                column, getColumnCount(), dataArea, plot.getDomainAxisEdge()<a name="line.300"></a>
<FONT color="green">301</FONT>            ) - state.getBarWidth() / 2.0;<a name="line.301"></a>
<FONT color="green">302</FONT>    <a name="line.302"></a>
<FONT color="green">303</FONT>            double positiveBase = getBase();<a name="line.303"></a>
<FONT color="green">304</FONT>            double negativeBase = positiveBase;<a name="line.304"></a>
<FONT color="green">305</FONT>    <a name="line.305"></a>
<FONT color="green">306</FONT>            for (int i = 0; i &lt; row; i++) {<a name="line.306"></a>
<FONT color="green">307</FONT>                Number v = dataset.getValue(i, column);<a name="line.307"></a>
<FONT color="green">308</FONT>                if (v != null) {<a name="line.308"></a>
<FONT color="green">309</FONT>                    double d = v.doubleValue();<a name="line.309"></a>
<FONT color="green">310</FONT>                    if (this.renderAsPercentages) {<a name="line.310"></a>
<FONT color="green">311</FONT>                        d = d / total;<a name="line.311"></a>
<FONT color="green">312</FONT>                    }<a name="line.312"></a>
<FONT color="green">313</FONT>                    if (d &gt; 0) {<a name="line.313"></a>
<FONT color="green">314</FONT>                        positiveBase = positiveBase + d;<a name="line.314"></a>
<FONT color="green">315</FONT>                    }<a name="line.315"></a>
<FONT color="green">316</FONT>                    else {<a name="line.316"></a>
<FONT color="green">317</FONT>                        negativeBase = negativeBase + d;<a name="line.317"></a>