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LoadingIndicator.cs
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LoadingIndicator.cs
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using System;
using Android.Graphics;
using Android.Views.Animations;
namespace Segmentus
{
class LoadingIndicator : DrawablePart
{
const int LapDuration = 1000;
const int CirclesCnt = 7;
const float FirstCircleProportion = 0.2f;
const float SizeMultiplier = 0.9f;
const float AngleBetween = 0.5f;
static Paint paint;
int radius;
float[] sizes = new float[CirclesCnt];
HandyAnimator anim;
float curAngle;
float CurAngle
{
get { return curAngle; }
set
{
curAngle = value;
OnAppearanceChanged();
}
}
static LoadingIndicator()
{
paint = new Paint(PaintFlags.AntiAlias);
paint.Color = ColorBank.GetColor(ColorBank.Red);
}
public LoadingIndicator(int radius, Pivot parentPivot, float x, float y)
: base(parentPivot, x, y)
{
this.radius = radius;
sizes[0] = radius * FirstCircleProportion;
for (int i = 1; i < CirclesCnt; ++i)
sizes[i] = sizes[i - 1] * SizeMultiplier;
}
public void Start()
{
anim = HandyAnimator.OfFloat((float)Math.PI * 2, 0, LapDuration);
anim.core.SetInterpolator(new LinearInterpolator());
anim.Update += (value) => CurAngle = (float)value;
anim.core.RepeatCount = -1;
anim.core.Start();
}
public void Stop()
{
anim.core.Cancel();
anim = null;
}
protected override void Draw(Canvas canvas)
{
for (int i = 0; i < CirclesCnt; ++i)
{
float ang = CurAngle + AngleBetween * i;
canvas.DrawCircle((float)(radius * Math.Cos(ang)),
(float)(radius * Math.Sin(ang)), sizes[i], paint);
}
}
}
}