308 lines
8.7 KiB
Kotlin
308 lines
8.7 KiB
Kotlin
/* Copyright 2023 Tusky Contributors
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* 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 along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.view
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Paint
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import android.graphics.Path
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import android.graphics.PathMeasure
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import android.graphics.Rect
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import android.util.AttributeSet
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import androidx.annotation.ColorInt
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import androidx.annotation.Dimension
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import androidx.appcompat.widget.AppCompatImageView
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import androidx.core.content.ContextCompat
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import com.keylesspalace.tusky.R
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import kotlin.math.max
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class GraphView @JvmOverloads constructor(
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context: Context,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = 0,
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defStyleRes: Int = 0,
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) : AppCompatImageView(context, attrs, defStyleAttr) {
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@get:ColorInt
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@ColorInt
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var primaryLineColor = 0
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@get:ColorInt
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@ColorInt
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var secondaryLineColor = 0
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@get:Dimension
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var lineWidth = 0f
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@get:ColorInt
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@ColorInt
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var graphColor = 0
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@get:ColorInt
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@ColorInt
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var metaColor = 0
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var proportionalTrending = false
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private lateinit var primaryLinePaint: Paint
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private lateinit var secondaryLinePaint: Paint
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private lateinit var primaryCirclePaint: Paint
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private lateinit var secondaryCirclePaint: Paint
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private lateinit var graphPaint: Paint
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private lateinit var metaPaint: Paint
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private lateinit var sizeRect: Rect
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private var primaryLinePath: Path = Path()
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private var secondaryLinePath: Path = Path()
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var maxTrendingValue: Long = 300
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var primaryLineData: List<Long> = if (isInEditMode) listOf(
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30, 60, 70, 80, 130, 190, 80,
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) else listOf(
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1, 1, 1, 1, 1, 1, 1,
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)
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set(value) {
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field = value.map { max(1, it) }
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primaryLinePath.reset()
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invalidate()
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}
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var secondaryLineData: List<Long> = if (isInEditMode) listOf(
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10, 20, 40, 60, 100, 132, 20,
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) else listOf(
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1, 1, 1, 1, 1, 1, 1,
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)
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set(value) {
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field = value.map { max(1, it) }
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secondaryLinePath.reset()
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invalidate()
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}
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init {
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initFromXML(attrs)
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}
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private fun initFromXML(attr: AttributeSet?) {
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val a = context.obtainStyledAttributes(attr, R.styleable.GraphView)
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primaryLineColor = ContextCompat.getColor(
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context,
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a.getResourceId(
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R.styleable.GraphView_primaryLineColor,
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R.color.tusky_blue,
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)
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)
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secondaryLineColor = ContextCompat.getColor(
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context,
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a.getResourceId(
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R.styleable.GraphView_secondaryLineColor,
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R.color.tusky_red,
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)
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)
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lineWidth = a.getDimensionPixelSize(
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R.styleable.GraphView_lineWidth,
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R.dimen.graph_line_thickness
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).toFloat()
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graphColor = ContextCompat.getColor(
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context,
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a.getResourceId(
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R.styleable.GraphView_graphColor,
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R.color.colorBackground,
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)
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)
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metaColor = ContextCompat.getColor(
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context,
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a.getResourceId(
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R.styleable.GraphView_metaColor,
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R.color.dividerColor,
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)
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)
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proportionalTrending = a.getBoolean(
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R.styleable.GraphView_proportionalTrending,
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proportionalTrending,
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)
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primaryLinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = primaryLineColor
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strokeWidth = lineWidth
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style = Paint.Style.STROKE
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}
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primaryCirclePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = primaryLineColor
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style = Paint.Style.FILL
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}
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secondaryLinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = secondaryLineColor
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strokeWidth = lineWidth
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style = Paint.Style.STROKE
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}
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secondaryCirclePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = secondaryLineColor
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style = Paint.Style.FILL
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}
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graphPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = graphColor
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}
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metaPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
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color = metaColor
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strokeWidth = 0f
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style = Paint.Style.STROKE
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}
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a.recycle()
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}
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private fun initializeVertices() {
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sizeRect = Rect(0, 0, width, height)
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initLine(primaryLineData, primaryLinePath)
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initLine(secondaryLineData, secondaryLinePath)
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}
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private fun initLine(lineData: List<Long>, path: Path) {
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val max = if (proportionalTrending) {
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maxTrendingValue
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} else {
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max(primaryLineData.max(), 1)
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}
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val mainRatio = height.toFloat() / max.toFloat()
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val ratioedData = lineData.map { it.toFloat() * mainRatio }
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val pointDistance = dataSpacing(ratioedData)
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/** X coord of the start of this path segment */
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var startX = 0F
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/** Y coord of the start of this path segment */
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var startY = 0F
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/** X coord of the end of this path segment */
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var endX: Float
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/** Y coord of the end of this path segment */
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var endY: Float
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/** X coord of bezier control point #1 */
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var controlX1: Float
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/** X coord of bezier control point #2 */
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var controlX2: Float
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// Draw cubic bezier curves between each pair of points.
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ratioedData.forEachIndexed { index, magnitude ->
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val x = pointDistance * index.toFloat()
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val y = height.toFloat() - magnitude
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if (index == 0) {
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path.reset()
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path.moveTo(x, y)
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startX = x
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startY = y
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} else {
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endX = x
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endY = y
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// X-coord for a control point is placed one third of the distance between the
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// two points.
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val offsetX = (endX - startX) / 3
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controlX1 = startX + offsetX
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controlX2 = endX - offsetX
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path.cubicTo(controlX1, startY, controlX2, endY, x, y)
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startX = x
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startY = y
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}
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}
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}
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private fun dataSpacing(data: List<Any>) = width.toFloat() / max(data.size - 1, 1).toFloat()
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override fun onDraw(canvas: Canvas?) {
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super.onDraw(canvas)
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if (primaryLinePath.isEmpty && width > 0) {
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initializeVertices()
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}
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canvas?.apply {
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drawRect(sizeRect, graphPaint)
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val pointDistance = dataSpacing(primaryLineData)
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// Vertical tick marks
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for (i in 0 until primaryLineData.size + 1) {
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drawLine(
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i * pointDistance,
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height.toFloat(),
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i * pointDistance,
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height - (height.toFloat() / 20),
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metaPaint
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)
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}
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// X-axis
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drawLine(0f, height.toFloat(), width.toFloat(), height.toFloat(), metaPaint)
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// Data lines
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drawLine(
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canvas = canvas,
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linePath = secondaryLinePath,
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linePaint = secondaryLinePaint,
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circlePaint = secondaryCirclePaint,
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lineThickness = lineWidth,
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)
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drawLine(
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canvas = canvas,
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linePath = primaryLinePath,
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linePaint = primaryLinePaint,
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circlePaint = primaryCirclePaint,
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lineThickness = lineWidth,
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)
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}
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}
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private fun drawLine(
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canvas: Canvas,
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linePath: Path,
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linePaint: Paint,
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circlePaint: Paint,
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lineThickness: Float,
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) {
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canvas.apply {
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drawPath(
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linePath,
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linePaint,
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)
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val pm = PathMeasure(linePath, false)
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val coord = floatArrayOf(0f, 0f)
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pm.getPosTan(pm.length * 1f, coord, null)
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drawCircle(coord[0], coord[1], lineThickness * 2f, circlePaint)
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}
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}
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}
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