1 /*
2  * Copyright (C) 2020 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 package com.android.test.silkfx.hdr
18 
19 import android.content.Context
20 import android.graphics.Canvas
21 import android.graphics.Paint
22 import android.graphics.RadialGradient
23 import android.graphics.RectF
24 import android.graphics.Shader
25 import android.util.AttributeSet
26 import com.android.test.silkfx.common.BaseDrawingView
27 import kotlin.math.min
28 
29 class RadialGlow(context: Context, attrs: AttributeSet?) : BaseDrawingView(context, attrs) {
30 
31     var glowToggle = false
32 
33     val glowColor = color(4f, 3.3f, 2.8f)
34     val bgColor = color(.15f, .15f, .15f)
35     val fgColor = color(.51f, .52f, .50f, .4f)
36     var glow: RadialGradient
37 
38     init {
39         glow = RadialGradient(0f, 0f, 100.dp(), glowColor, bgColor, Shader.TileMode.CLAMP)
40         isClickable = true
41         setOnClickListener {
42             glowToggle = !glowToggle
43             invalidate()
44         }
45     }
46 
47     override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
48         super.onSizeChanged(w, h, oldw, oldh)
49         glow = RadialGradient(0f, 0f,
50             min(w, h).toFloat(), glowColor, bgColor, Shader.TileMode.CLAMP)
51     }
52 
53     override fun onDraw(canvas: Canvas) {
54         super.onDraw(canvas)
55         val radius = 10.dp()
56 
57         val paint = Paint()
58         paint.isDither = true
59         paint.isAntiAlias = true
60         paint.textSize = 18.dp()
61         paint.textAlign = Paint.Align.CENTER
62 
63         val rect = RectF(0f, 0f, width.toFloat(), height.toFloat())
64 
65         paint.setColor(bgColor)
66         canvas.drawRoundRect(rect, radius, radius, paint)
67 
68         if (glowToggle) {
69             paint.shader = glow
70             canvas.save()
71             val frac = (drawingTime % 5000) / 5000f
72             canvas.translate(rect.width() * frac, rect.height() - (rect.height() * frac))
73             canvas.drawPaint(paint)
74             canvas.restore()
75             paint.shader = null
76             invalidate()
77         }
78 
79         paint.setColor(fgColor)
80         val innerRect = RectF(rect)
81         innerRect.inset(rect.width() / 4, rect.height() / 4)
82         canvas.drawRoundRect(innerRect, radius, radius, paint)
83 
84         paint.setColor(color(1f, 1f, 1f))
85         canvas.drawText("Tap to toggle animation", rect.centerX(), innerRect.top - 4.dp(), paint)
86         canvas.drawText("Outside text", rect.centerX(), rect.bottom - 4.dp(), paint)
87         canvas.drawText("Inside text", innerRect.centerX(), innerRect.bottom - 4.dp(), paint)
88     }
89 }