1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 */
17
18 package com.android.compose.ui.util
19
20 import androidx.compose.ui.geometry.isSpecified
21 import androidx.compose.ui.geometry.lerp
22 import androidx.compose.ui.unit.IntSize
23 import androidx.compose.ui.util.lerp
24 import com.android.compose.animation.scene.Scale
25
26 /** Linearly interpolate between [start] and [stop] with [fraction] fraction between them. */
lerpnull27 fun lerp(start: IntSize, stop: IntSize, fraction: Float): IntSize {
28 return IntSize(
29 lerp(start.width, stop.width, fraction),
30 lerp(start.height, stop.height, fraction),
31 )
32 }
33
34 /** Linearly interpolate between [start] and [stop] with [fraction] fraction between them. */
lerpnull35 fun lerp(start: Scale, stop: Scale, fraction: Float): Scale {
36 val pivot =
37 when {
38 start.pivot.isSpecified && stop.pivot.isSpecified ->
39 lerp(start.pivot, stop.pivot, fraction)
40 start.pivot.isSpecified -> start.pivot
41 else -> stop.pivot
42 }
43 return Scale(
44 lerp(start.scaleX, stop.scaleX, fraction),
45 lerp(start.scaleY, stop.scaleY, fraction),
46 pivot,
47 )
48 }
49