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Commit d00cd37f authored by Mike Schneider's avatar Mike Schneider
Browse files

Render shape of non-linear functions in the debug output 

Test: Manual
Flag: EXEMPT debug code only
Bug: 391553479
Change-Id: I4a9d18cb64595acfc6cfe1eb535c0960d1e98256
parent c1b28e1d

mechanics/src/com/android/mechanics/debug/DebugVisualization.kt

+25 −4
Original line number Diff line number Diff line
@@ -50,8 +50,10 @@ import com.android.mechanics.MotionValue 
import com.android.mechanics.spec.DirectionalMotionSpec

import com.android.mechanics.spec.Guarantee

import com.android.mechanics.spec.InputDirection

import com.android.mechanics.spec.Mapping

import com.android.mechanics.spec.MotionSpec

import com.android.mechanics.spec.SegmentKey

import kotlin.math.ceil

import kotlin.math.max

import kotlin.math.min

import kotlinx.coroutines.flow.first
@@ -359,17 +361,36 @@ private fun DrawScope.drawDirectionalSpec( 
        val segmentEnd = endBreakpoint.position

        val toInput = segmentEnd.fastCoerceAtMost(inputRange.endInclusive)



        // TODO add support for functions that are not linear

        val strokeWidth = if (isActiveSegment) 2.dp.toPx() else Stroke.HairlineWidth

        val dotSize = if (isActiveSegment) 4.dp.toPx() else 2.dp.toPx()

        val fromY = mapPointInOutputToY(mapping.map(fromInput), outputRange)

        val toY = mapPointInOutputToY(mapping.map(toInput), outputRange)



        val start = Offset(mapPointInInputToX(fromInput, inputRange), fromY)

        val end = Offset(mapPointInInputToX(toInput, inputRange), toY)

        if (mapping is Mapping.Fixed || mapping is Mapping.Identity || mapping is Mapping.Linear) {

            drawLine(color, start, end, strokeWidth = strokeWidth)

        } else {

            val xStart = mapPointInInputToX(fromInput, inputRange)

            val xEnd = mapPointInInputToX(toInput, inputRange)



        val strokeWidth = if (isActiveSegment) 2.dp.toPx() else Stroke.HairlineWidth

        val dotSize = if (isActiveSegment) 4.dp.toPx() else 2.dp.toPx()

            val oneDpInPx = 1.dp.toPx()

            val numberOfLines = ceil((xEnd - xStart) / oneDpInPx).toInt()

            val inputLength = (toInput - fromInput) / numberOfLines



        drawLine(color, start, end, strokeWidth = strokeWidth)

            repeat(numberOfLines) {

                val lineStart = fromInput + inputLength * it

                val lineEnd = lineStart + inputLength



                val partialFromY = mapPointInOutputToY(mapping.map(lineStart), outputRange)

                val partialToY = mapPointInOutputToY(mapping.map(lineEnd), outputRange)



                val partialStart = Offset(mapPointInInputToX(lineStart, inputRange), partialFromY)

                val partialEnd = Offset(mapPointInInputToX(lineEnd, inputRange), partialToY)



                drawLine(color, partialStart, partialEnd, strokeWidth = strokeWidth)

            }

        }



        if (segmentStart == fromInput) {

            drawCircle(color, dotSize, start)