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package com.pitchedapps.frost.views
import android.animation.ValueAnimator
import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.util.AttributeSet
import android.view.View
/**
* Created by Allan Wang on 2016-11-17.
*
*
* Canvas drawn ripples that keep the previous color
* Extends to view dimensions
* Supports multiple ripples from varying locations
*/
class RippleCanvas @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
val paint: Paint = Paint()
var baseColor = Color.TRANSPARENT
val ripples: MutableList<Ripple> = mutableListOf()
init {
paint.isAntiAlias = true
paint.style = Paint.Style.FILL
}
override fun onDraw(canvas: Canvas) {
canvas.drawColor(baseColor)
val itr = ripples.iterator()
while (itr.hasNext()) {
val r = itr.next()
paint.color = r.color
canvas.drawCircle(r.x, r.y, r.radius, paint)
if (r.radius == r.maxRadius) {
itr.remove()
baseColor = r.color
}
}
}
@JvmOverloads fun ripple(color: Int, startX: Float = 0f, startY: Float = 0f, duration: Int = 1000) {
var x = startX
var y = startY
val w = width.toFloat()
val h = height.toFloat()
if (x == MIDDLE)
x = w / 2
else if (x > w) x = 0f
if (y == MIDDLE)
y = h / 2
else if (y > h) y = 0f
val maxRadius = Math.hypot(Math.max(x, w - x).toDouble(), Math.max(y, h - y).toDouble()).toFloat()
val ripple = Ripple(color, x, y, 0f, maxRadius)
ripples.add(ripple)
val animator = ValueAnimator.ofFloat(0f, maxRadius)
animator.duration = duration.toLong()
animator.addUpdateListener { animation ->
ripple.setRadius(animation.animatedValue as Float)
invalidate()
}
animator.start()
}
fun set(color: Int) {
baseColor = color
ripples.clear()
invalidate()
}
inner class Ripple internal constructor(val color: Int, val x: Float, val y: Float, var radius: Float, val maxRadius: Float) {
internal fun setRadius(r: Float) {
radius = r
}
}
companion object {
val MIDDLE = -1.0f
}
}
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