Android Achartengine Learning

I. General introduction ofAchartengine

achartengine : Each chart requires a dataset (dataset) and a renderer set (Renderer);

-- Data set : Also made up of many data

-- renderer : Also made up of different sub-renderers

-- get activity or component : the Chart factory (chartfactory) can generate graphicalview with graphs or Graphicalac by calling datasets (datasets) and renderer collections (Renderer) Tivity

For example, a chart factory (Chartfactory) creates a intent of a line chart by passing data from the data set (DataSet) and renderer collection (Renderer).

Intent Intent = chartfactory.getlinechartintent (context,dataset,renderer);

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Second, Achartengine related class introduction

--Xymultipleseriesdataset: A DataSet that encapsulates the data needed for a chart and needs to include xyseries in this data set

-xyseries: part of the chart dataset, each representing a data set such as a polyline, a chart can have more than one line, all the data together is the data set Xymultipleseriesdataset;

--Xymultipleseriesrenderer: renderer set, renderer for multiple curves in the chart;

--Xyseriesrenderer: a single curve or unit renderer, one chart may have multiple curves or bars, each of which requires a renderer, and all renderers together are the renderer set Xymultipleseriesrendere R

Three, achartengine main code parsing

1. Graph Histogram Chart Data set

(1) for x y-axis data is Double

Related class Description:

--Xymultipleseriesdataset class: This class can encapsulate data sets of graphs such as graph histogram, the generality of which is that the values are composed of x and Y values, which need to be passed into the x-axis data and y-axis data separately;

--Xyseries class: There are multiple curves in the chart, which encapsulates a collection of individual curves, and xymultipleseriesdataset encapsulates multiple xyseries;

Data that needs to be prepared:

--Single set of data name collection: string[] titles, single-group data names each curve may have a name, and a chart may have multiple curves, so a header array is needed here;

--X-axis data set: List<double[]> xValues, x-axis data set, where each array is the x-axis data of a curve, and the entire List set is the data of multiple curves;

--y-axis data set: list<double[]> yvalues, y-axis data set, the entire List set is the y-axis data set for multiple curves;

The relevant method is detailed:

--Create a Xymultipleseriesdataset object: Call the parameterless constructor directly, Xymultipleseriesdataset DataSet = new Xymultipleseriesdataset ();

--Create a Xyseries object: The object is a single curve data, you can set a single curve title, x-axis data array, y-axis data array, Xyseries series = new Xyseries (String titles, float scale );

--Add data for a single curve: The Xyseries object adds two arrays, respectively, the x-axis and y-axis data, Series.add (Xv[k], yv[k]);

--Add the Xyseries object to the Xymultipleseriesdataset object: Dataset.addseries (series);

(2) The x-axis is the date y-axis is Double

Related class Description:

--Xymultipleseriesdataset: This kind of date-value graph, the chart dataset used is also the class;

--TimeSeries: This is different, because the data of a single curve is to encapsulate the Date array, so we use the class to encapsulate date[] and double[] data;

Data that needs to be prepared:

--string[] titles: There are multiple polylines in the chart, and each element in the array is the title of a polyline;

--Each date[in the list<date[]> xvalues:list set is the x-axis data of a curve;

--list<double[]> yvalues:list each double[] in the collection is the y-axis data of a curve;

Description of the relevant methods:

--Create a single curve data TimeSeries object: TimeSeries series = new TimeSeries (Titles[i]), the parameter is the title name of the curve;

--Set the date and value array to the TimeSeries object: Series.add (Xv[k], yv[k]);

--Set the TimeSeries object to the Xymultipleseriesdataset object: Dataset.addseries (series);

2. Graph Graph Renderer

(1) Curve rendering

Related class Description:

--Xymultipleseriesrenderer: The overall graph renderer, which encapsulates many xyseriesrenderer single-curve renderers;

--Xyseriesrenderer: A single curve renderer that sets the color and style of the curve;

Data preparation:

--int[] Colors: Color set, each curve must have a color value;

--pointstyle[] styles: A collection of curve styles, each with its own drawing style;

Xymultipleseriesrenderer Related Method Introduction:

--Set XY axis title font size: setaxistitletextsize (int size);

--Set table header size: setcharttitletextsize (int size);

--Set Label text size: setlabelstextsize (int size);

--Set Description text size: setlegendtextsize (int size);

--Set the size of the point: setpointsize (int size);

--Add a single curve renderer: Addseriesrenderer (render);

Xyseriesrenderer Related Method Introduction:

--Create object: Xyseriesrenderer r = new Xyseriesrenderer ();

--Set individual curve color: R.setcolor (colors[i]);

--Set individual curve drawing style: R.setpointstyle (styles[i]);

(2) axis settings

Renderer parameter setting: The axis rendering is mainly a series of parameter setting for Xymultipleseriesrenderer, which is the method of calling the Xymultipleseriesrenderer object;

--Set the curve title: Setcharttitle (String tittle);

--Set X axis title: Setxtitle (String tittle);

--Set Y axis title: setytitle (String tittle);

--Set X-axis minimum: setxaxismin (double);

--Set X axis maximum: Setxaxismax (double);

--Set the y-axis minimum value: Setyaxismin (double);

--Set Y-axis maximum: Setyaxismax (double);

--Set axis color: Setaxescolor ();

--Set Label color: Setlabelscolor ();

3. Pie chart Data Set

(1) Single pie chart dataset

Related class Description:

--Categoryseries: Pie chart data set;

Description of the relevant methods:

--Add Data elements: Categoryseries.add (String category, double value), with the arguments being names and values, respectively;

(2) Multi-pie chart data set

Related class Description:

--multiplecategoryseries: Multi-pie chart dataset, which has no relationship with the Categoryseries object of the single pie chart dataset;

Prepare the data:

--Pie chart Each element name: list<string[]> titles, where the array in the collection is a collection of each element of a pie chart;

--the size of each element of the pie chart: list<double[]> values, where the array is the size of each element of a pie chart;

Description of the relevant methods:

--Create a multi-pie chart DataSet: Multiplecategoryseries series = new Multiplecategoryseries (title), the name of the incoming chart;

--Add a pie chart of data: Series.add (tittle, titles.get (k), value), the first argument is a single pie chart name, the second argument is a pie chart element name string array, and the third is the pie chart element size double[] Number Group

4. Pie chart Renderer

Related class Description:

--Defaultrenderer: Pie chart renderer, single pie chart and multi-pie chart renderer used are all the same;

--Defaultrenderer: Pie chart single element renderer, a pie chart has more than one renderer rendered, and the entire chart has multiple sets of the renderer;

Data preparation:

--Pie chart element color: int[] colors, all the colors in the pie chart are placed in an array, each element has a color;

Defaultrenderer class Method Description:

--Construction Method: Defaultrenderer renderer = new Defaultrenderer ();

--Set Label text size: setlabelstextsize (int size);

--Set Description text size: setlegendtextsize (int size);

--Set margin: SetMargins (new int[] {20, 30, 15, 0});

--Add the Simpleseriesrenderer object to the Renderer collection: Addseriesrenderer (R);

Simpleseriesrenderer Method:

--Constructor: Simpleseriesrenderer r = new Simpleseriesrenderer ();

--Set color: setcolor (color);

5. Column Chart Datasets

Related class Description:

--Xymultipleseriesdataset: Encapsulates the data of a histogram, which may have multiple histograms, each encapsulating several categoryseries individual data set objects;

-Categoryseries: Data from a single histogram in a histogram can be encapsulated into a xymultipleseriesdataset data set;

Data preparation:

--Histogram title: string[] titles, because there may be multiple bars in a histogram chart, a string array is required to hold the headings;

--Histogram value: list<double[]> values, each array in the collection represents the value of a bar chart;

Categoryseries Method Description:

--Constructor: Categoryseries series = new Categoryseries (Titles[i]), the passed parameter is the value of the histogram;

--Set the value size: Series.add (double), the specific value needs one to go to set;

--Conversion type: Series.toxyseries (), only converted to Xyseries object, can be added to the Xymultipleseriesdataset object;

6. Bar Chart Renderer

Related class Description:

--Xymultipleseriesrenderer: The histogram renderer set is the same as the renderer of the graph, which encapsulates a lot of simpleseriesrenderer objects;

--Simpleseriesrenderer: A single histogram renderer in a histogram that can be encapsulated into a Xymultipleseriesrenderer object;

Prepare the data:

--Histogram color: int[] Colors, a histogram chart contains a number of bars, each histogram set a color;

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Android Achartengine Learning