LineChart

Simple graphic representation of data changing during the time

How to use?

1. Copy chartLib as module to your project
2. In settings.gradle file add library as module ':chartLib', so the file should look like
   

  include ':chartLib', ':YOUR_APP_NAME'

3. In module level build.gradle file add next line to block dependencies
   

dependencies{
    implementation project(':chartLib')
}

4. Declare TimeLineChart view in your layout as shown below

    <com.contest.chart.TimeLineChart
            android:id="@+id/chart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" /> 

5. Find chart view and set prepared data

      val chartData : LineChartData = prepareData()
      val chart: TimeLineChart = findViewById(R.id.chart)
      chart.setTitle("YOUR CHART TITLE")
      chart.setData(chartData)

6. Chart supports Light and Dark themes, to switch between them just call method switchTheme() on class instance
   

chart.switchTheme()

7. In order to represent your data, chart requires you to provide data as instance of class LineChartData
   

class LineChartData(val id: Int) {
  val brokenLines = ArrayList<BrokenLine>()
  lateinit var timeLine: LongArray
}

Field timeLine is array of long that represented time line during wich your data changes.
Since chart can represent a few chart lines simultaneously in one view with the same time frame, you need to provide your data as instance of class BrokenLine and add it to brokenLines list.

Class BrokenLine declaration

class BrokenLine(val points: FloatArray, val name: String, val color: String)

where:
points - array of values of your data
name - name of data
color - color in HEX format

IMPORTANT: size of points and timeLine arrays should be always equal

8. Min API level 21