mirror of
https://github.com/meshtastic/Meshtastic-Android.git
synced 2026-04-20 22:23:37 +00:00
122 lines
4.5 KiB
Kotlin
122 lines
4.5 KiB
Kotlin
/*
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* Copyright (c) 2025 Meshtastic LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.geeksville.mesh.util
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import android.content.res.Resources
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import androidx.compose.ui.geometry.Offset
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import androidx.compose.ui.graphics.Brush
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.graphics.Path
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import androidx.compose.ui.graphics.StrokeCap
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import androidx.compose.ui.graphics.asAndroidPath
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import androidx.compose.ui.graphics.asComposePath
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import androidx.compose.ui.graphics.drawscope.DrawContext
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import androidx.compose.ui.graphics.drawscope.DrawScope
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import androidx.compose.ui.graphics.drawscope.Stroke
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import androidx.compose.ui.unit.dp
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import org.meshtastic.proto.TelemetryProtos.Telemetry
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object GraphUtil {
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val RADIUS = Resources.getSystem().displayMetrics.density * 2
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/**
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* @param value Must be zero-scaled before passing.
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* @param divisor The range for the data set.
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*/
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fun plotPoint(drawContext: DrawContext, color: Color, x: Float, value: Float, divisor: Float) {
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val height = drawContext.size.height
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val ratio = value / divisor
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val y = height - (ratio * height)
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drawContext.canvas.drawCircle(
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center = Offset(x, y),
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radius = RADIUS,
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paint = androidx.compose.ui.graphics.Paint().apply { this.color = color },
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)
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}
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/**
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* Creates a [Path] that could be used to draw a line from the `index` to the end of `telemetries` or the last point
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* before a time separation between [Telemetry]s.
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*
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* @param telemetries data used to create the [Path]
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* @param index current place in the [List]
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* @param path [Path] that will be used to draw
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* @param timeRange The time range for the data set
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* @param width of the [DrawContext]
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* @param timeThreshold to determine significant breaks in time between [Telemetry]s
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* @param calculateY (`index`) -> `y` coordinate
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* @return the current index after iterating
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*/
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fun createPath(
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telemetries: List<Telemetry>,
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index: Int,
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path: Path,
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oldestTime: Int,
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timeRange: Int,
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width: Float,
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timeThreshold: Long,
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calculateY: (Int) -> Float,
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): Int {
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var i = index
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var isNewLine = true
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with(path) {
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while (i < telemetries.size) {
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val telemetry = telemetries[i]
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val nextTelemetry = telemetries.getOrNull(i + 1) ?: telemetries.last()
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/* Check to see if we have a significant time break between telemetries. */
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if (nextTelemetry.time - telemetry.time > timeThreshold) {
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i++
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break
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}
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val x1Ratio = (telemetry.time - oldestTime).toFloat() / timeRange
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val x1 = x1Ratio * width
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val y1 = calculateY(i)
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val x2Ratio = (nextTelemetry.time - oldestTime).toFloat() / timeRange
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val x2 = x2Ratio * width
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val y2 = calculateY(i + 1)
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if (isNewLine || i == 0) {
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isNewLine = false
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moveTo(x1, y1)
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}
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quadraticTo(x1, y1, (x1 + x2) / 2f, (y1 + y2) / 2f)
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i++
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}
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}
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return i
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}
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fun DrawScope.drawPathWithGradient(path: Path, color: Color, height: Float, x1: Float, x2: Float) {
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drawPath(path = path, color = color, style = Stroke(width = 2.dp.toPx(), cap = StrokeCap.Round))
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val fillPath =
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android.graphics.Path(path.asAndroidPath()).asComposePath().apply {
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lineTo(x1, height)
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lineTo(x2, height)
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close()
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}
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drawPath(
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path = fillPath,
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brush = Brush.verticalGradient(colors = listOf(color.copy(alpha = 0.5f), Color.Transparent), endY = height),
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)
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}
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}
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