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<FONT color="green">163</FONT> */<a name="line.163"></a><FONT color="green">164</FONT> public void setMaximumItemWidth(double percent) {<a name="line.164"></a><FONT color="green">165</FONT> setMaxItemWidth(percent);<a name="line.165"></a><FONT color="green">166</FONT> }<a name="line.166"></a><FONT color="green">167</FONT> <a name="line.167"></a><FONT color="green">168</FONT> /**<a name="line.168"></a><FONT color="green">169</FONT> * Initialises the renderer and returns a state object that will be passed <a name="line.169"></a><FONT color="green">170</FONT> * to subsequent calls to the drawItem method.<a name="line.170"></a><FONT color="green">171</FONT> * <p><a name="line.171"></a><FONT color="green">172</FONT> * This method gets called once at the start of the process of drawing a <a name="line.172"></a><FONT color="green">173</FONT> * chart.<a name="line.173"></a><FONT color="green">174</FONT> *<a name="line.174"></a><FONT color="green">175</FONT> * @param g2 the graphics device.<a name="line.175"></a><FONT color="green">176</FONT> * @param dataArea the area in which the data is to be plotted.<a name="line.176"></a><FONT color="green">177</FONT> * @param plot the plot.<a name="line.177"></a><FONT color="green">178</FONT> * @param rendererIndex the renderer index.<a name="line.178"></a><FONT color="green">179</FONT> * @param info collects chart rendering information for return to caller.<a name="line.179"></a><FONT color="green">180</FONT> * <a name="line.180"></a><FONT color="green">181</FONT> * @return The renderer state.<a name="line.181"></a><FONT color="green">182</FONT> *<a name="line.182"></a><FONT color="green">183</FONT> */<a name="line.183"></a><FONT color="green">184</FONT> public CategoryItemRendererState initialise(Graphics2D g2,<a name="line.184"></a><FONT color="green">185</FONT> Rectangle2D dataArea,<a name="line.185"></a><FONT color="green">186</FONT> CategoryPlot plot,<a name="line.186"></a><FONT color="green">187</FONT> int rendererIndex,<a name="line.187"></a><FONT color="green">188</FONT> PlotRenderingInfo info) {<a name="line.188"></a><FONT color="green">189</FONT> <a name="line.189"></a><FONT color="green">190</FONT> CategoryItemRendererState state = super.initialise(g2, dataArea, plot, <a name="line.190"></a><FONT color="green">191</FONT> rendererIndex, info);<a name="line.191"></a><FONT color="green">192</FONT> calculateItemWidth(plot, dataArea, rendererIndex, state);<a name="line.192"></a><FONT color="green">193</FONT> return state;<a name="line.193"></a><FONT color="green">194</FONT> <a name="line.194"></a><FONT color="green">195</FONT> }<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> * Calculates the bar width and stores it in the renderer state.<a name="line.198"></a><FONT color="green">199</FONT> * <a name="line.199"></a><FONT color="green">200</FONT> * @param plot the plot.<a name="line.200"></a><FONT color="green">201</FONT> * @param dataArea the data area.<a name="line.201"></a><FONT color="green">202</FONT> * @param rendererIndex the renderer index.<a name="line.202"></a><FONT color="green">203</FONT> * @param state the renderer state.<a name="line.203"></a><FONT color="green">204</FONT> */<a name="line.204"></a><FONT color="green">205</FONT> protected void calculateItemWidth(CategoryPlot plot, <a name="line.205"></a><FONT color="green">206</FONT> Rectangle2D dataArea, <a name="line.206"></a><FONT color="green">207</FONT> int rendererIndex,<a name="line.207"></a><FONT color="green">208</FONT> CategoryItemRendererState state) {<a name="line.208"></a><FONT color="green">209</FONT> <a name="line.209"></a><FONT color="green">210</FONT> CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);<a name="line.210"></a><FONT color="green">211</FONT> CategoryDataset dataset = plot.getDataset(rendererIndex);<a name="line.211"></a><FONT color="green">212</FONT> if (dataset != null) {<a name="line.212"></a><FONT color="green">213</FONT> int columns = dataset.getColumnCount();<a name="line.213"></a><FONT color="green">214</FONT> int rows = dataset.getRowCount();<a name="line.214"></a><FONT color="green">215</FONT> double space = 0.0;<a name="line.215"></a><FONT color="green">216</FONT> PlotOrientation orientation = plot.getOrientation();<a name="line.216"></a><FONT color="green">217</FONT> if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.217"></a><FONT color="green">218</FONT> space = dataArea.getHeight();<a name="line.218"></a><FONT color="green">219</FONT> }<a name="line.219"></a><FONT color="green">220</FONT> else if (orientation == PlotOrientation.VERTICAL) {<a name="line.220"></a><FONT color="green">221</FONT> space = dataArea.getWidth();<a name="line.221"></a><FONT color="green">222</FONT> }<a name="line.222"></a><FONT color="green">223</FONT> double maxWidth = space * getMaxItemWidth();<a name="line.223"></a><FONT color="green">224</FONT> double categoryMargin = 0.0;<a name="line.224"></a><FONT color="green">225</FONT> double currentItemMargin = 0.0;<a name="line.225"></a><FONT color="green">226</FONT> if (columns > 1) {<a name="line.226"></a><FONT color="green">227</FONT> categoryMargin = domainAxis.getCategoryMargin();<a name="line.227"></a><FONT color="green">228</FONT> }<a name="line.228"></a><FONT color="green">229</FONT> if (rows > 1) {<a name="line.229"></a><FONT color="green">230</FONT> currentItemMargin = getItemMargin();<a name="line.230"></a><FONT color="green">231</FONT> }<a name="line.231"></a><FONT color="green">232</FONT> double used = space * (1 - domainAxis.getLowerMargin() <a name="line.232"></a><FONT color="green">233</FONT> - domainAxis.getUpperMargin()<a name="line.233"></a><FONT color="green">234</FONT> - categoryMargin - currentItemMargin);<a name="line.234"></a><FONT color="green">235</FONT> if ((rows * columns) > 0) {<a name="line.235"></a><FONT color="green">236</FONT> state.setBarWidth(Math.min(used / (rows * columns), maxWidth));<a name="line.236"></a><FONT color="green">237</FONT> }<a name="line.237"></a><FONT color="green">238</FONT> else {<a name="line.238"></a><FONT color="green">239</FONT> state.setBarWidth(Math.min(used, maxWidth));<a name="line.239"></a><FONT color="green">240</FONT> }<a name="line.240"></a><FONT color="green">241</FONT> }<a name="line.241"></a><FONT color="green">242</FONT> }<a name="line.242"></a><FONT color="green">243</FONT> <a name="line.243"></a><FONT color="green">244</FONT> /**<a name="line.244"></a><FONT color="green">245</FONT> * Calculates the coordinate of the first "side" of a bar. This will be <a name="line.245"></a><FONT color="green">246</FONT> * the minimum x-coordinate for a vertical bar, and the minimum <a name="line.246"></a><FONT color="green">247</FONT> * y-coordinate for a horizontal bar.<a name="line.247"></a><FONT color="green">248</FONT> * <a name="line.248"></a><FONT color="green">249</FONT> * @param plot the plot.<a name="line.249"></a><FONT color="green">250</FONT> * @param orientation the plot orientation.<a name="line.250"></a><FONT color="green">251</FONT> * @param dataArea the data area.<a name="line.251"></a><FONT color="green">252</FONT> * @param domainAxis the domain axis.<a name="line.252"></a><FONT color="green">253</FONT> * @param state the renderer state (has the bar width precalculated).<a name="line.253"></a><FONT color="green">254</FONT> * @param row the row index.<a name="line.254"></a><FONT color="green">255</FONT> * @param column the column index.<a name="line.255"></a><FONT color="green">256</FONT> * <a name="line.256"></a><FONT color="green">257</FONT> * @return The coordinate.<a name="line.257"></a><FONT color="green">258</FONT> */<a name="line.258"></a><FONT color="green">259</FONT> protected double calculateBarW0(CategoryPlot plot, <a name="line.259"></a><FONT color="green">260</FONT> PlotOrientation orientation, <a name="line.260"></a><FONT color="green">261</FONT> Rectangle2D dataArea,<a name="line.261"></a><FONT color="green">262</FONT> CategoryAxis domainAxis,<a name="line.262"></a><FONT color="green">263</FONT> CategoryItemRendererState state,<a name="line.263"></a><FONT color="green">264</FONT> int row,<a name="line.264"></a><FONT color="green">265</FONT> int column) {<a name="line.265"></a><FONT color="green">266</FONT> // calculate bar width...<a name="line.266"></a><FONT color="green">267</FONT> double space = 0.0;<a name="line.267"></a><FONT color="green">268</FONT> if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.268"></a><FONT color="green">269</FONT> space = dataArea.getHeight();<a name="line.269"></a><FONT color="green">270</FONT> }<a name="line.270"></a><FONT color="green">271</FONT> else {<a name="line.271"></a><FONT color="green">272</FONT> space = dataArea.getWidth();<a name="line.272"></a><FONT color="green">273</FONT> }<a name="line.273"></a><FONT color="green">274</FONT> double barW0 = domainAxis.getCategoryStart(column, getColumnCount(), <a name="line.274"></a><FONT color="green">275</FONT> dataArea, plot.getDomainAxisEdge());<a name="line.275"></a><FONT color="green">276</FONT> int seriesCount = getRowCount();<a name="line.276"></a><FONT color="green">277</FONT> int categoryCount = getColumnCount();<a name="line.277"></a><FONT color="green">278</FONT> if (seriesCount > 1) {<a name="line.278"></a><FONT color="green">279</FONT> double seriesGap = space * getItemMargin() <a name="line.279"></a><FONT color="green">280</FONT> / (categoryCount * (seriesCount - 1));<a name="line.280"></a><FONT color="green">281</FONT> double seriesW = calculateSeriesWidth(space, domainAxis, <a name="line.281"></a><FONT color="green">282</FONT> categoryCount, seriesCount);<a name="line.282"></a><FONT color="green">283</FONT> barW0 = barW0 + row * (seriesW + seriesGap) <a name="line.283"></a><FONT color="green">284</FONT> + (seriesW / 2.0) - (state.getBarWidth() / 2.0);<a name="line.284"></a><FONT color="green">285</FONT> }<a name="line.285"></a><FONT color="green">286</FONT> else {<a name="line.286"></a><FONT color="green">287</FONT> barW0 = domainAxis.getCategoryMiddle(column, getColumnCount(), <a name="line.287"></a><FONT color="green">288</FONT> dataArea, plot.getDomainAxisEdge()) - state.getBarWidth() <a name="line.288"></a><FONT color="green">289</FONT> / 2.0;<a name="line.289"></a><FONT color="green">290</FONT> }<a name="line.290"></a><FONT color="green">291</FONT> return barW0;<a name="line.291"></a><FONT color="green">292</FONT> }<a name="line.292"></a><FONT color="green">293</FONT> <a name="line.293"></a><FONT color="green">294</FONT> /**<a name="line.294"></a><FONT color="green">295</FONT> * Draws the bar for a single (series, category) data item.<a name="line.295"></a><FONT color="green">296</FONT> *<a name="line.296"></a><FONT color="green">297</FONT> * @param g2 the graphics device.<a name="line.297"></a><FONT color="green">298</FONT> * @param state the renderer state.<a name="line.298"></a><FONT color="green">299</FONT> * @param dataArea the data area.<a name="line.299"></a><FONT color="green">300</FONT> * @param plot the plot.<a name="line.300"></a><FONT color="green">301</FONT> * @param domainAxis the domain axis.<a name="line.301"></a><FONT color="green">302</FONT> * @param rangeAxis the range axis.<a name="line.302"></a><FONT color="green">303</FONT> * @param dataset the dataset.<a name="line.303"></a><FONT color="green">304</FONT> * @param row the row index (zero-based).<a name="line.304"></a><FONT color="green">305</FONT> * @param column the column index (zero-based).<a name="line.305"></a><FONT color="green">306</FONT> * @param pass the pass index.<a name="line.306"></a><FONT color="green">307</FONT> */<a name="line.307"></a><FONT color="green">308</FONT> public void drawItem(Graphics2D g2, CategoryItemRendererState state,<a name="line.308"></a><FONT color="green">309</FONT> Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis,<a name="line.309"></a><FONT color="green">310</FONT> ValueAxis rangeAxis, CategoryDataset dataset, int row, int column,<a name="line.310"></a><FONT color="green">311</FONT> int pass) {<a name="line.311"></a><FONT color="green">312</FONT> <a name="line.312"></a><FONT color="green">313</FONT> // nothing is drawn for null values...<a name="line.313"></a><FONT color="green">314</FONT> Number dataValue = dataset.getValue(row, column);<a name="line.314"></a><FONT color="green">315</FONT> if (dataValue == null) {<a name="line.315"></a><FONT color="green">316</FONT> return;<a name="line.316"></a><FONT color="green">317</FONT> }<a name="line.317"></a><FONT color="green">318</FONT> <a name="line.318"></a><FONT color="green">319</FONT> double value = dataValue.doubleValue();<a name="line.319"></a><FONT color="green">320</FONT> <a name="line.320"></a><FONT color="green">321</FONT> PlotOrientation orientation = plot.getOrientation();<a name="line.321"></a><FONT color="green">322</FONT> double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis, <a name="line.322"></a><FONT color="green">323</FONT> state, row, column);<a name="line.323"></a><FONT color="green">324</FONT> RectangleEdge edge = plot.getRangeAxisEdge();<a name="line.324"></a><FONT color="green">325</FONT> double barL = rangeAxis.valueToJava2D(value, dataArea, edge);<a name="line.325"></a><FONT color="green">326</FONT> <a name="line.326"></a><FONT color="green">327</FONT> // draw the bar...<a name="line.327"></a>⌨️ 快捷键说明
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