void DrawBackground(ACanvas canvas, int width, int height, CornerRadius cornerRadius, bool pressed)
{
using (var paint = new Paint {
AntiAlias = true
})
using (Path.Direction direction = Path.Direction.Cw)
using (Paint.Style style = Paint.Style.Fill)
{
var path = new Path();
if (_pancake.Sides != 4)
{
path = ShapeUtils.CreatePolygonPath(width, height, _pancake.Sides, _pancake.CornerRadius.TopLeft, _pancake.OffsetAngle);
}
else
{
float topLeft = _convertToPixels(cornerRadius.TopLeft);
float topRight = _convertToPixels(cornerRadius.TopRight);
float bottomRight = _convertToPixels(cornerRadius.BottomRight);
float bottomLeft = _convertToPixels(cornerRadius.BottomLeft);
path = ShapeUtils.CreateRoundedRectPath(width, height, topLeft, topRight, bottomRight, bottomLeft);
}
if ((_pancake.BackgroundGradientStartColor != default(Xamarin.Forms.Color) && _pancake.BackgroundGradientEndColor != default(Xamarin.Forms.Color)) || (_pancake.BackgroundGradientStops != null && _pancake.BackgroundGradientStops.Any()))
{
var angle = _pancake.BackgroundGradientAngle / 360.0;
// Calculate the new positions based on angle between 0-360.
var a = width * Math.Pow(Math.Sin(2 * Math.PI * ((angle + 0.75) / 2)), 2);
var b = height * Math.Pow(Math.Sin(2 * Math.PI * ((angle + 0.0) / 2)), 2);
var c = width * Math.Pow(Math.Sin(2 * Math.PI * ((angle + 0.25) / 2)), 2);
var d = height * Math.Pow(Math.Sin(2 * Math.PI * ((angle + 0.5) / 2)), 2);
if (_pancake.BackgroundGradientStops != null && _pancake.BackgroundGradientStops.Count > 0)
{
// A range of colors is given. Let's add them.
var orderedStops = _pancake.BackgroundGradientStops.OrderBy(x => x.Offset).ToList();
var colors = orderedStops.Select(x => x.Color.ToAndroid().ToArgb()).ToArray();
var locations = orderedStops.Select(x => x.Offset).ToArray();
var shader = new LinearGradient(width - (float)a, (float)b, width - (float)c, (float)d, colors, locations, Shader.TileMode.Clamp);
paint.SetShader(shader);
}
else
{
// Only two colors provided, use that.
var shader = new LinearGradient(width - (float)a, (float)b, width - (float)c, (float)d, _pancake.BackgroundGradientStartColor.ToAndroid(), _pancake.BackgroundGradientEndColor.ToAndroid(), Shader.TileMode.Clamp);
paint.SetShader(shader);
}
}
else
{
global::Android.Graphics.Color color = _pancake.BackgroundColor.ToAndroid();
paint.SetStyle(style);
paint.Color = color;
}
canvas.DrawPath(path, paint);
}
}
