jfreechart

问题 I have a dataset of points (x,y) and I would like to create an heatmap of this dataset. More specifically, I would like an image in which I have lighter colors in the areas where I have a bigger concentration of points and darker where there are less points. I am using JFreeChart libraries and I found some classes for example DefaultHeatMapDataset but I am not sure how to use them in the proper way. Does anybody has a clue on how to do it? Thanks in advance! Giovanni 回答1: Use an

问题 I'm using JFreeChart to plot some data and using a LogAxis for the range axis. I'm stumped as to why I can't seem to get the minor ticks to show up on the axis, but the grid lines show up fine. If I don't use the LogAxis I can turn the minor ticks on and off fine using setMinorTickMarksVisible() . Example below: public ChartOne(){ XYSeriesCollection xysc = new XYSeriesCollection(); XYSeries x1 = new XYSeries("Series 1"); x1.add(0.5, 2); x1.add(1, 2.2); x1.add(2, 2.4); x1.add(10, 2.75); x1.add

问题 I'm simulating dummy real-time data using DynamicTimeSeriesCollection, like this. During random intervals, the data being passed to the plot should 'dropout' to simulate a network connection loss. At this point, this plot should stop drawing and only start plotting the data after the dropout has subsided. I subclassed XYLineAndShapeRenderer and overrode the getItemLineVisible() method: @Override public boolean getItemLineVisible(int series, int item){ if(offline){ return false; }else{ return

问题 [EDIT] Based on this example, I am now able to collect data and display it in a chart. I don't know exactly how to integrate that code that generates the chart into my application. /** @see http://stackoverflow.com/questions/5048852 */ public class Atol extends ApplicationFrame { private static final String TITLE = "Dynamic Series"; private static final String START = "Start"; private static final String STOP = "Stop"; private static final float MINMAX = 100; private static final int COUNT =

问题 I'm making an application in Java using JFreeChart which shows an XY line chart. The problem is that it shows every point of the dataset on the lines, and I don't want to display these points. Any idea on how to remove the points or make them not visible? This is a sample screenshot: Here is the code: JFrame frame = new JFrame(); XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(); renderer.setSeriesPaint(0, Color.RED); renderer.setSeriesStroke(0, new BasicStroke(2.0f, BasicStroke

问题 I'm making an application in Java using JFreeChart which shows an XY line chart. The problem is that it shows every point of the dataset on the lines, and I don't want to display these points. Any idea on how to remove the points or make them not visible? This is a sample screenshot: Here is the code: JFrame frame = new JFrame(); XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(); renderer.setSeriesPaint(0, Color.RED); renderer.setSeriesStroke(0, new BasicStroke(2.0f, BasicStroke

问题 I expect to create Status chart like this However I cant XAXis Category was rendered incorrectly. Here is my code I studied from JFreeChart - horizontal stacked bar chart with date axis private static final String STANDBY_SERIES = "STANDBY"; private static final String HEATING_SERIES = "HEATING"; private static final String HOLDING_SERIES = "HOLDING"; private static final String COOLING_SERIES = "COOLING"; private static final String LOWERING_SERIES = "LOWERING"; private static final int

问题 I'm using an XYBoxAnnotation to demarcate a rectangular area on a JFreeChart. I would like one side of the box to be "open", i.e go out to infinity. I tried setting the value to Double.POSITIVE_INFINITY but this did not seem to work. I also tried setting it to Double.MAX_VALUE , with no luck either. In these cases, the annotation doesn't even show up on the plot at all. And there are no exceptions thrown. Below is a very simple version of my code in which I generate the XYBoxAnnotation and

问题 I am trying to plot a simple line chart and almost everything is fine, I am populating my dataset with a simple code like this: DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(-10 , "S21" , "1000" ); dataset.addValue(-20 , "S21" , "1001" ); dataset.addValue(-25 , "S21" , "1002" ); dataset.addValue(-30 , "S21" , "1003" ); dataset.addValue(-25 , "S21" , "1004" ); ... then I create a line chart: lineChart = ChartFactory.createLineChart( "S21", "Frequency (MHz)",

问题 I want to create multiple ScatterPlot chart on JFreeChart and to do so I've used the function createCombinedChart() . With my current code I get multiple charts just like the CombinedXYPlotDemo1 that you can found, but those are line chart and I want them as ScatterPlot. I've found this question but after trying I can't figure out how to make it work (maybe I just don't understand how to use it) here is a sample of my code (it's very similar to the Demo code + I retrieve from my database and