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Adjust LinearChart to deal with max-min values #1

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Adjust LinearChart to deal with max-min values #1

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18 changes: 12 additions & 6 deletions ...ckLinearChart/app/src/main/java/io/github/brunogabriel/jetpacklinearchart/MainActivity.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -41,18 +41,24 @@ sealed class LinearChartStyle {
fun LinearChart(
modifier: Modifier = Modifier,
style: LinearChartStyle = LinearChartStyle.Default,
data: List<Int>
data: List<Float>
) {
if (data.isEmpty()) {
return
}

Canvas(modifier = modifier) {
// distance between each x point
val distance = size.width / (data.size + 1)
var currentX = 0F
val maxValue = data.maxOrNull() ?: 0
val maxValue = data.max()
val minValue = data.min()
val points = mutableListOf<PointF>()

data.forEachIndexed { index, currentData ->
if (data.size >= index + 2) {
val y0 = (maxValue - currentData) * (size.height / maxValue)
val y0 = if (maxValue == minValue) size.height / 2 else
(maxValue - currentData) / (maxValue - minValue) * size.height
val x0 = currentX + distance
points.add(PointF(x0, y0))
currentX += distance
Expand Down Expand Up @@ -122,7 +128,7 @@ fun LinearChartApplication() {
}

private fun provideMockData() = listOf(
5929, 6898, 8961, 5674, 7122, 6592, 3427, 5520, 4680, 7418,
4743, 4080, 3611, 7295, 9900, 12438, 11186, 5439, 4227, 5138,
11115, 8386, 12450, 10411, 10852, 7782, 7371, 4983, 9234, 6847
5929f, 6898f, 8961f, 5674f, 7122f, 6592f, 3427f, 5520f, 4680f, 7418f,
4743f, 4080f, 3611f, 7295f, 9900f, 12438f, 11186f, 5439f, 4227f, 5138f,
11115f, 8386f, 12450f, 10411f, 10852f, 7782f, 7371f, 4983f, 9234f, 6847f
)