private void DrawSolidCircle(Canvas canvas, int i, int iterations, Paint p)
{
p.SetStyle(Paint.Style.FillAndStroke);
var radius = ShadowHelpers.GetOldWidth(canvas.Width, (int)_densityOffsetX, _iterations) / 2 - (i - iterations);
DrawCircle(canvas, p, radius);
}
private void DrawShadowsOutsideBackground(Canvas canvas, Paint p, int iterations)
{
for (int i = 0; i < iterations; i++)
{
p.Color = _colors[i];
var radius = ShadowHelpers.GetOldWidth(canvas.Width, (int)_densityOffsetX, _iterations) / 2 + i;
DrawCircle(canvas, p, radius);
}
}
public override void Draw(Canvas canvas)
{
var center = GetCanvasCenter(canvas);
var oldWidth = ShadowHelpers.GetOldWidth(canvas.Width, (int)_densityOffsetX, _iterations) / 2;
var radius = oldWidth + _iterations - 1;
CreateAndSetShader(canvas, center, oldWidth, radius);
_paint.Alpha = _drawableAlpha;
_paint.AntiAlias = true;
canvas.DrawCircle(center.X, center.Y, radius, _paint);
}
private void DrawShadowsBehindBackground(Canvas canvas, Paint p, int iterations)
{
var pivotParameter = GetPivotParameter(canvas);
for (int i = iterations + 1; i < pivotParameter / 2; i++)
{
//'Inside' shadow will be with negative index
p.Color = GetColorValue((i - iterations) * -1);
//If Alpha = 255 for 'inside' shadow, then we can draw solid circle and break the loop
if (p.Color == _config.Color)
{
DrawSolidCircle(canvas, i, iterations, p);
break;
}
var radius = ShadowHelpers.GetOldWidth(canvas.Width, (int)_densityOffsetX, _iterations) / 2 - (i - iterations);
DrawCircle(canvas, p, radius);
}
}
public UpdatedCircleShadowDrawable(ShadowConfig config)
{
if (config == null)
{
throw new ArgumentNullException(nameof(config));
}
//Stroke width sgould be device density, to avoid broken pixels
//_paint.StrokeWidth = 1f;//(float)(Math.Round(Application.Context.Resources.DisplayMetrics.Density));
_circleShadowState = new UpdatedCircleShadowState(config);
_config = config;
_iterations = (int)Helpers.DpToPx(_config.Blur);
_densityOffsetX = Helpers.DpToPx(_config.Offset.X);
//Wrong implementation for y offset should be inverted
//TODO need to fix
_densityOffsetY = Helpers.DpToPx(_config.Offset.Y) * -1;
_offsetWithBlurX = ShadowHelpers.GetOffsetWithBlur((int)_densityOffsetX, _iterations);
_offsetWithBlurY = ShadowHelpers.GetOffsetWithBlur((int)_densityOffsetY, _iterations);
}
//Get center point for drawing shadow circle,
//Take into account offset, blur, view translations, etc.
private PointF GetCanvasCenter(Canvas canvas)
{
float x = 0;
float y = 0;
if (_densityOffsetX > 0)
{
if (_offsetWithBlurX == 0)
{
x = GetPivotParameter(canvas) / 2 + _offsetWithBlurX;
}
else
{
x = ShadowHelpers.GetOldWidth(canvas.Width, (int)_densityOffsetX, _iterations) / 2 + _densityOffsetX;
}
}
else
{
//shouldnt move anything because view itself already moved
//just draw on the center
x = ((float)GetPivotParameter(canvas) / 2);
}
if (_densityOffsetY > 0)
{
y = ((float)GetPivotParameter(canvas) / 2) - _offsetWithBlurY;
}
else
{
if (_offsetWithBlurY == 0)
{
y = ((float)GetPivotParameter(canvas) / 2);// + _densityOffsetY * -1;
}
else
{
y = ShadowHelpers.GetOldWidth(canvas.Height, (int)_densityOffsetY, _iterations) / 2 - _densityOffsetY;
}
}
return(new PointF(x, y));
}
