A custom graph View Object for Android.

Still in development.

GraphView is a custom graphing library for Android. GraphView can handle multiple styles of line graph, including data sets that are not organized in ascending order. GraphView uses the basic Android Canvas methods to draw the graph and all of its associated pieces.

GraphView uses a custom data class to wrap a simple PointF[] that represents the data set to drawn, a Paint Object to tell GraphView how to style your data set when it is drawn, and an Integer flag, used to represent the style of graph you wish your data set to be drawn in.

GraphView currently supports four different styles of graphs:

1. Standard X, Y graph
2. Incremental graph
3. Constant lines
4. Binary state graphs

GraphView currently supports two different styles of labels:

1. Standard X, Y labels
2. Incremental X, with normal Y labels

Both of the following graphs come from the same data set, but are displayed using the Incremental graph and labels next to a Standard graph and labels.

In your project level gradle file, add the following:

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

and in your app level gradle file add the following:

implementation 'com.github.sortagreg:GraphView:1.0RC'

XML:

<com.sortagreg.graphview.GraphView
        android:id="@+id/graphView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/background_light"
        app:title="Graph Title"/>

FragmentGraph:

// Using ButterKnife to bind the GraphView
@BindView(R.id.graphView)
GraphView graphView;

int DATA_SET_LENGTH = 50;

// Instantiate a PointF[] to hold a data set
PointF[] exponentialCurve = new PointF[DATA_SET_LENGTH];

// Populate the data set
for (int i = 0; i <= DATA_SET_LENGTH - 1; i++) {
    float x = i - 25;
    PointF point = new PointF(x, x * x * x);
    exponentialCurve[i] = point;
}

// Create a Paint object to style the line for the data set
Paint paint = new Paint();
paint.setStrokeWidth(5f);
paint.setColor(0xFFFF3355);

// GraphViewDataModel is a custom data wrapper class included in this library
GraphViewDataModel dataModel = new GraphViewDataModel(exponentialCurve, paint, GraphViewDataModel.STANDARD_LINE);

// Draw the data set
graphView.addToDataSetList(dataModel);

Many of the portions of GraphView can be customized to fit your needs. Options can be set in the XML or in Java.

• axisMarginTop : float
• axisMarginBottom : float
• axisMarginLeft : float
• axisMarginRight : float
• graphPaddingFactor : float
• shouldDrawBox : boolean
• labelStyle : Standard, Unfolded, Custom
• title : String

Note: attribute android:background must be set, otherwise the background of the GraphView will be transparent.

Copyright 2018 Marshall Ladd

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0