📄 histogramdataset.html
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<FONT color="green">185</FONT> } <a name="line.185"></a><FONT color="green">186</FONT> // fill the bins<a name="line.186"></a><FONT color="green">187</FONT> for (int i = 0; i < values.length; i++) {<a name="line.187"></a><FONT color="green">188</FONT> int binIndex = bins - 1;<a name="line.188"></a><FONT color="green">189</FONT> if (values[i] < maximum) {<a name="line.189"></a><FONT color="green">190</FONT> double fraction = (values[i] - minimum) / (maximum - minimum);<a name="line.190"></a><FONT color="green">191</FONT> if (fraction < 0.0) {<a name="line.191"></a><FONT color="green">192</FONT> fraction = 0.0;<a name="line.192"></a><FONT color="green">193</FONT> }<a name="line.193"></a><FONT color="green">194</FONT> binIndex = (int) (fraction * bins);<a name="line.194"></a><FONT color="green">195</FONT> }<a name="line.195"></a><FONT color="green">196</FONT> HistogramBin bin = (HistogramBin) binList.get(binIndex);<a name="line.196"></a><FONT color="green">197</FONT> bin.incrementCount();<a name="line.197"></a><FONT color="green">198</FONT> }<a name="line.198"></a><FONT color="green">199</FONT> // generic map for each series<a name="line.199"></a><FONT color="green">200</FONT> Map map = new HashMap();<a name="line.200"></a><FONT color="green">201</FONT> map.put("key", key);<a name="line.201"></a><FONT color="green">202</FONT> map.put("bins", binList);<a name="line.202"></a><FONT color="green">203</FONT> map.put("values.length", new Integer(values.length));<a name="line.203"></a><FONT color="green">204</FONT> map.put("bin width", new Double(binWidth));<a name="line.204"></a><FONT color="green">205</FONT> this.list.add(map);<a name="line.205"></a><FONT color="green">206</FONT> }<a name="line.206"></a><FONT color="green">207</FONT> <a name="line.207"></a><FONT color="green">208</FONT> /**<a name="line.208"></a><FONT color="green">209</FONT> * Returns the minimum value in an array of values.<a name="line.209"></a><FONT color="green">210</FONT> * <a name="line.210"></a><FONT color="green">211</FONT> * @param values the values (<code>null</code> not permitted and <a name="line.211"></a><FONT color="green">212</FONT> * zero-length array not permitted).<a name="line.212"></a><FONT color="green">213</FONT> * <a name="line.213"></a><FONT color="green">214</FONT> * @return The minimum value.<a name="line.214"></a><FONT color="green">215</FONT> */<a name="line.215"></a><FONT color="green">216</FONT> private double getMinimum(double[] values) {<a name="line.216"></a><FONT color="green">217</FONT> if (values == null || values.length < 1) {<a name="line.217"></a><FONT color="green">218</FONT> throw new IllegalArgumentException(<a name="line.218"></a><FONT color="green">219</FONT> "Null or zero length 'values' argument.");<a name="line.219"></a><FONT color="green">220</FONT> }<a name="line.220"></a><FONT color="green">221</FONT> double min = Double.MAX_VALUE;<a name="line.221"></a><FONT color="green">222</FONT> for (int i = 0; i < values.length; i++) {<a name="line.222"></a><FONT color="green">223</FONT> if (values[i] < min) {<a name="line.223"></a><FONT color="green">224</FONT> min = values[i];<a name="line.224"></a><FONT color="green">225</FONT> }<a name="line.225"></a><FONT color="green">226</FONT> }<a name="line.226"></a><FONT color="green">227</FONT> return min;<a name="line.227"></a><FONT color="green">228</FONT> }<a name="line.228"></a><FONT color="green">229</FONT> <a name="line.229"></a><FONT color="green">230</FONT> /**<a name="line.230"></a><FONT color="green">231</FONT> * Returns the maximum value in an array of values.<a name="line.231"></a><FONT color="green">232</FONT> * <a name="line.232"></a><FONT color="green">233</FONT> * @param values the values (<code>null</code> not permitted and <a name="line.233"></a><FONT color="green">234</FONT> * zero-length array not permitted).<a name="line.234"></a><FONT color="green">235</FONT> * <a name="line.235"></a><FONT color="green">236</FONT> * @return The maximum value.<a name="line.236"></a><FONT color="green">237</FONT> */<a name="line.237"></a><FONT color="green">238</FONT> private double getMaximum(double[] values) {<a name="line.238"></a><FONT color="green">239</FONT> if (values == null || values.length < 1) {<a name="line.239"></a><FONT color="green">240</FONT> throw new IllegalArgumentException(<a name="line.240"></a><FONT color="green">241</FONT> "Null or zero length 'values' argument.");<a name="line.241"></a><FONT color="green">242</FONT> }<a name="line.242"></a><FONT color="green">243</FONT> double max = -Double.MAX_VALUE;<a name="line.243"></a><FONT color="green">244</FONT> for (int i = 0; i < values.length; i++) {<a name="line.244"></a><FONT color="green">245</FONT> if (values[i] > max) {<a name="line.245"></a><FONT color="green">246</FONT> max = values[i];<a name="line.246"></a><FONT color="green">247</FONT> }<a name="line.247"></a><FONT color="green">248</FONT> }<a name="line.248"></a><FONT color="green">249</FONT> return max;<a name="line.249"></a><FONT color="green">250</FONT> }<a name="line.250"></a><FONT color="green">251</FONT> <a name="line.251"></a><FONT color="green">252</FONT> /**<a name="line.252"></a><FONT color="green">253</FONT> * Returns the bins for a series.<a name="line.253"></a><FONT color="green">254</FONT> * <a name="line.254"></a><FONT color="green">255</FONT> * @param series the series index (in the range <code>0</code> to <a name="line.255"></a><FONT color="green">256</FONT> * <code>getSeriesCount() - 1</code>).<a name="line.256"></a><FONT color="green">257</FONT> * <a name="line.257"></a><FONT color="green">258</FONT> * @return A list of bins.<a name="line.258"></a><FONT color="green">259</FONT> * <a name="line.259"></a><FONT color="green">260</FONT> * @throws IndexOutOfBoundsException if <code>series</code> is outside the<a name="line.260"></a><FONT color="green">261</FONT> * specified range.<a name="line.261"></a><FONT color="green">262</FONT> */<a name="line.262"></a><FONT color="green">263</FONT> List getBins(int series) {<a name="line.263"></a><FONT color="green">264</FONT> Map map = (Map) this.list.get(series);<a name="line.264"></a><FONT color="green">265</FONT> return (List) map.get("bins"); <a name="line.265"></a><FONT color="green">266</FONT> }<a name="line.266"></a><FONT color="green">267</FONT> <a name="line.267"></a><FONT color="green">268</FONT> /**<a name="line.268"></a><FONT color="green">269</FONT> * Returns the total number of observations for a series.<a name="line.269"></a><FONT color="green">270</FONT> * <a name="line.270"></a><FONT color="green">271</FONT> * @param series the series index.<a name="line.271"></a><FONT color="green">272</FONT> * <a name="line.272"></a><FONT color="green">273</FONT> * @return The total.<a name="line.273"></a><FONT color="green">274</FONT> */<a name="line.274"></a><FONT color="green">275</FONT> private int getTotal(int series) {<a name="line.275"></a><FONT color="green">276</FONT> Map map = (Map) this.list.get(series);<a name="line.276"></a><FONT color="green">277</FONT> return ((Integer) map.get("values.length")).intValue(); <a name="line.277"></a><FONT color="green">278</FONT> }<a name="line.278"></a><FONT color="green">279</FONT> <a name="line.279"></a><FONT color="green">280</FONT> /**<a name="line.280"></a><FONT color="green">281</FONT> * Returns the bin width for a series.<a name="line.281"></a><FONT color="green">282</FONT> * <a name="line.282"></a><FONT color="green">283</FONT> * @param series the series index (zero based).<a name="line.283"></a><FONT color="green">284</FONT> * <a name="line.284"></a><FONT color="green">285</FONT> * @return The bin width.<a name="line.285"></a><FONT color="green">286</FONT> */<a name="line.286"></a><FONT color="green">287</FONT> private double getBinWidth(int series) {<a name="line.287"></a><FONT color="green">288</FONT> Map map = (Map) this.list.get(series);<a name="line.288"></a><FONT color="green">289</FONT> return ((Double) map.get("bin width")).doubleValue(); <a name="line.289"></a><FONT color="green">290</FONT> }<a name="line.290"></a><FONT color="green">291</FONT> <a name="line.291"></a><FONT color="green">292</FONT> /**<a name="line.292"></a><FONT color="green">293</FONT> * Returns the number of series in the dataset.<a name="line.293"></a><FONT color="green">294</FONT> * <a name="line.294"></a><FONT color="green">295</FONT> * @return The series count.<a name="line.295"></a><FONT color="green">296</FONT> */<a name="line.296"></a><FONT color="green">297</FONT> public int getSeriesCount() { <a name="line.297"></a><FONT color="green">298</FONT> return this.list.size(); <a name="line.298"></a><FONT color="green">299</FONT> }<a name="line.299"></a><FONT color="green">300</FONT> <a name="line.300"></a><FONT color="green">301</FONT> /**<a name="line.301"></a><FONT color="green">302</FONT> * Returns the key for a series.<a name="line.302"></a><FONT color="green">303</FONT> * <a name="line.303"></a><FONT color="green">304</FONT> * @param series the series index (in the range <code>0</code> to <a name="line.304"></a><FONT color="green">305</FONT> * <code>getSeriesCount() - 1</code>).<a name="line.305"></a><FONT color="green">306</FONT> * <a name="line.306"></a><FONT color="green">307</FONT> * @return The series key.<a name="line.307"></a><FONT color="green">308</FONT> * <a name="line.308"></a><FONT color="green">309</FONT> * @throws IndexOutOfBoundsException if <code>series</code> is outside the<a name="line.309"></a><FONT color="green">310</FONT> * specified range.<a name="line.310"></a><FONT color="green">311</FONT> */<a name="line.311"></a><FONT color="green">312</FONT> public Comparable getSeriesKey(int series) {<a name="line.312"></a><FONT color="green">313</FONT> Map map = (Map) this.list.get(series);<a name="line.313"></a><FONT color="green">314</FONT> return (Comparable) map.get("key"); <a name="line.314"></a><FONT color="green">315</FONT> }<a name="line.315"></a><FONT color="green">316</FONT> <a name="line.316"></a><FONT color="green">317</FONT> /**<a name="line.317"></a><FONT color="green">318</FONT> * Returns the number of data items for a series.<a name="line.318"></a><FONT color="green">319</FONT> * <a name="line.319"></a><FONT color="green">320</FONT> * @param series the series index (in the range <code>0</code> to <a name="line.320"></a><FONT color="green">321</FONT> * <code>getSeriesCount() - 1</code>).<a name="line.321"></a><FONT color="green">322</FONT> * <a name="line.322"></a><FONT color="green">323</FONT> * @return The item count.<a name="line.323"></a><FONT color="green">324</FONT> * <a name="line.324"></a><FONT color="green">325</FONT> * @throws IndexOutOfBoundsException if <code>series</code> is outside the<a name="line.325"></a><FONT color="green">326</FONT> * specified range.<a name="line.326"></a><FONT color="green">327</FONT> */<a name="line.327"></a><FONT color="green">328</FONT> public int getItemCount(int series) {<a name="line.328"></a><FONT color="green">329</FONT> return getBins(series).size(); <a name="line.329"></a><FONT color="green">330</FONT> }<a name="line.330"></a><FONT color="green">331</FONT> <a name="line.331"></a><FONT color="green">332</FONT> /**<a name="line.332"></a><FONT color="green">333</FONT> * Returns the X value for a bin. This value won't be used for plotting <a name="line.333"></a><FONT color="green">334</FONT> * histograms, since the renderer will ignore it. But other renderers can <a name="line.334"></a><FONT color="green">335</FONT> * use it (for example, you could use the dataset to create a line<a name="line.335"></a><FONT color="green">336</FONT> * chart).<a name="line.336"></a><FONT color="green">337</FONT> * <a name="line.337"></a><FONT color="green">338</FONT> * @param series the series index (in the range <code>0</code> to <a name="line.338"></a><FONT color="green">339</FONT> * <code>getSeriesCount() - 1</code>).<a name="line.339"></a><FONT color="green">340</FONT> * @param item the item index (zero based).<a name="line.340"></a><FONT color="green">341</FONT> * <a name="line.341"></a><FONT color="green">342</FONT> * @return The start value.<a name="line.342"></a><FONT color="green">343</FONT> * <a name="line.343"></a><FONT color="green">344</FONT> * @throws IndexOutOfBoundsException if <code>series</code> is outside the<a name="line.344"></a><FONT color="green">345</FONT> * specified range.<a name="line.345"></a><FONT color="green">346</FONT> */<a name="line.346"></a><FONT color="green">347</FONT> public Number getX(int series, int item) {<a name="line.347"></a><FONT color="green">348</FONT> List bins = getBins(series);<a name="line.348"></a><FONT color="green">349</FONT> HistogramBin bin = (HistogramBin) bins.get(item);<a name="line.349"></a><FONT color="green">350</FONT> double x = (bin.getStartBoundary() + bin.getEndBoundary()) / 2.;<a name="line.350"></a><FONT color="green">351</FONT> return new Double(x);<a name="line.351"></a><FONT color="green">352</FONT> }<a name="line.352"></a><FONT color="green">353</FONT> <a name="line.353"></a><FONT color="green">354</FONT> /**<a name="line.354"></a><FONT color="green">355</FONT> * Returns the y-value for a bin (calculated to take into account the <a name="line.355"></a><FONT color="green">356</FONT> * histogram type).<a name="line.356"></a><FONT color="green">357</FONT> * <a name="line.357"></a><FONT color="green">358</FONT> * @param series the series index (in the range <code>0</code> to <a name="line.358"></a><FONT color="green">359</FONT> * <code>getSeriesCount() - 1</code>).<a name="line.359"></a><FONT color="green">360</FONT> * @param item the item index (zero based).<a name="line.360"></a><FONT color="green">361</FONT> * <a name="line.361"></a><FONT color="green">362</FONT> * @return The y-value.<a name="line.362"></a><FONT color="green">363</FONT> * <a name="line.363"></a><FONT color="green">364</FONT> * @throws IndexOutOfBoundsException if <code>series</code> is outside the<a name="line.364"></a><FONT color="green">365</FONT> * specified range.<a name="line.365"></a><FONT color="green">366</FONT> */<a name="line.366"></a><FONT color="green">367</FONT> public Number getY(int series, int item) {<a name="line.367"></a><FONT color="green">368</FONT> List bins = getBins(series);<a name="line.368"></a><FONT color="green">369</FONT> HistogramBin bin = (HistogramBin) bins.get(item);<a name="line.369"></a><FONT color="green">370</FONT> double total = getTotal(series);<a name="line.370"></a><FONT color="green">371</FONT> double binWidth = getBinWidth(series);<a name="line.371"></a>⌨️ 快捷键说明
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