Created
January 21, 2023 13:57
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Translating Object from PathAnimation
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package com.nikhil.here.pathanimation.ui.common | |
import android.graphics.PathMeasure | |
import androidx.compose.animation.core.Animatable | |
import androidx.compose.animation.core.tween | |
import androidx.compose.foundation.layout.Box | |
import androidx.compose.foundation.layout.offset | |
import androidx.compose.runtime.Composable | |
import androidx.compose.runtime.LaunchedEffect | |
import androidx.compose.runtime.mutableStateOf | |
import androidx.compose.runtime.remember | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.geometry.Offset | |
import androidx.compose.ui.graphics.Path | |
import androidx.compose.ui.graphics.asAndroidPath | |
import androidx.compose.ui.unit.IntOffset | |
import androidx.compose.ui.zIndex | |
@Composable | |
fun TranslatingObject( | |
modifier: Modifier = Modifier, | |
startDestination: Offset, | |
endDestination: Offset, | |
content: @Composable () -> Unit, | |
onProgressUpdateListener: (progress: Float) -> Unit | |
) { | |
val animationOffset = remember { mutableStateOf(Offset(0f, 0f)) } | |
val shouldShow = remember { mutableStateOf(false) } | |
val pathAnimatable = remember { Animatable(0f) } | |
LaunchedEffect(key1 = true) { | |
val pos = FloatArray(2) | |
val tan = FloatArray(2) | |
val pathToAnimate = Path().apply { | |
val verticalDistance = endDestination.y - startDestination.y | |
val horizontalDistance = endDestination.x - startDestination.x | |
//cubic-bezier(.71,0,.29,1) | |
val c1x = startDestination.x + (0.71 * horizontalDistance) | |
val c1y = startDestination.y - (0.71 * verticalDistance) | |
val c2x = startDestination.x + (0.29 * horizontalDistance) | |
val c2y = endDestination.y | |
moveTo(startDestination.x, startDestination.y) | |
cubicTo( | |
x1 = c1x.toFloat(), | |
y1 = c1y.toFloat(), | |
x2 = c2x.toFloat(), | |
y2 = c2y.toFloat(), | |
x3 = endDestination.x, | |
y3 = endDestination.y | |
) | |
} | |
PathMeasure().apply { | |
setPath(pathToAnimate.asAndroidPath(), false) | |
pathAnimatable.animateTo(1f, tween(1500)) { | |
getPosTan(length * this.value, pos, tan) | |
animationOffset.value = Offset(pos[0], pos[1]) | |
onProgressUpdateListener(this.value) | |
when (this.value) { | |
0f -> { | |
shouldShow.value = true | |
} | |
1f -> { | |
shouldShow.value = false | |
} | |
} | |
} | |
} | |
} | |
if (shouldShow.value) { | |
Box( | |
modifier = modifier | |
.offset { | |
IntOffset( | |
(animationOffset.value.x).toInt(), | |
(animationOffset.value.y).toInt() | |
) | |
} | |
.zIndex(999f) | |
) { | |
content() | |
} | |
} | |
} | |
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