jfreechart

问题 I'm newbie in JFreechart. I've a dataset which contains more records(>50 ) i.e (the X-values are products and Y-Axis are quantity) , in the chart i want to display only first 15 records in the X-axis. I'm using CategoryAxis like. final CategoryPlot plot = chart.getCategoryPlot(); final CategoryAxis domainAxis = plot.getDomainAxis(); Anyone please guide me to do this.? 回答1: This doesn't appear to be an axis problem. One simple expedient would be to add only the desired records, but

问题 I'm newbie in JFreechart. I've a dataset which contains more records(>50 ) i.e (the X-values are products and Y-Axis are quantity) , in the chart i want to display only first 15 records in the X-axis. I'm using CategoryAxis like. final CategoryPlot plot = chart.getCategoryPlot(); final CategoryAxis domainAxis = plot.getDomainAxis(); Anyone please guide me to do this.? 回答1: This doesn't appear to be an axis problem. One simple expedient would be to add only the desired records, but

问题 Why does this code: DefaultCategoryDataset datasetE = new DefaultCategoryDataset(); datasetE.addValue(0.5, "HOLDING", "NOME 1"); datasetE.addValue(0.7, "HOLDING", "NOME 2"); datasetE.addValue(0.1, "HEATING", "NOME 3"); datasetE.addValue(0.5, "HEATING", "NOME 4"); datasetE.addValue(0.8, "HEATING", "NOME 5"); JFreeChart jfreechart = ChartFactory.createStackedBarChart("Stacked Bar Chart Demo 1", "Category", "Value", datasetE, PlotOrientation.VERTICAL, true, true, false); jfreechart

问题 Why does this code: DefaultCategoryDataset datasetE = new DefaultCategoryDataset(); datasetE.addValue(0.5, "HOLDING", "NOME 1"); datasetE.addValue(0.7, "HOLDING", "NOME 2"); datasetE.addValue(0.1, "HEATING", "NOME 3"); datasetE.addValue(0.5, "HEATING", "NOME 4"); datasetE.addValue(0.8, "HEATING", "NOME 5"); JFreeChart jfreechart = ChartFactory.createStackedBarChart("Stacked Bar Chart Demo 1", "Category", "Value", datasetE, PlotOrientation.VERTICAL, true, true, false); jfreechart

问题 I've never used JFreeChart before. It has been told me that it's a pretty good product for drawing charts in Java. I have a doubt, and I would like to have some advices by someone that has already some JFreeChart experience: is JFreeChart designed only for display static precomputed set of values? Or is there any "pretty easy" way to handle mouse event (possibly dragging) in order to dynamically change the displayed curves (and consequentely the associated data set)? With "pretty easy" I mean

问题 I've never used JFreeChart before. It has been told me that it's a pretty good product for drawing charts in Java. I have a doubt, and I would like to have some advices by someone that has already some JFreeChart experience: is JFreeChart designed only for display static precomputed set of values? Or is there any "pretty easy" way to handle mouse event (possibly dragging) in order to dynamically change the displayed curves (and consequentely the associated data set)? With "pretty easy" I mean

问题 I've never used JFreeChart before. It has been told me that it's a pretty good product for drawing charts in Java. I have a doubt, and I would like to have some advices by someone that has already some JFreeChart experience: is JFreeChart designed only for display static precomputed set of values? Or is there any "pretty easy" way to handle mouse event (possibly dragging) in order to dynamically change the displayed curves (and consequentely the associated data set)? With "pretty easy" I mean

问题 I made an application that would show me Max, Minimum, and Average ping when I click "start" in my JFrame application. I made a white box so I could fit a dynamically changing line graph that will be in the same window as my stats, and will update at the same rate as my stats (1 second). No matter how much I google, everybody seems to understand the JFreeChart sample code. I do not understand how to implement that at all. Other tutorials show just the graph as a standalone in its own window.

问题 I made an application that would show me Max, Minimum, and Average ping when I click "start" in my JFrame application. I made a white box so I could fit a dynamically changing line graph that will be in the same window as my stats, and will update at the same rate as my stats (1 second). No matter how much I google, everybody seems to understand the JFreeChart sample code. I do not understand how to implement that at all. Other tutorials show just the graph as a standalone in its own window.

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