private PointF ToNativePointFPixels(
Point point)
{
return(new PointF(
NativeConversions.DevicePixelsToPixels(this.NativeContext, point.X),
NativeConversions.DevicePixelsToPixels(this.NativeContext, point.Y)));
}
private RectF ToNativeRectFPixels(
Rectangle rectangle)
{
return(new RectF(
NativeConversions.DevicePixelsToPixels(this.NativeContext, rectangle.X),
NativeConversions.DevicePixelsToPixels(this.NativeContext, rectangle.Y),
NativeConversions.DevicePixelsToPixels(this.NativeContext, rectangle.Right),
NativeConversions.DevicePixelsToPixels(this.NativeContext, rectangle.Bottom)));
}
public void DrawRectangle(
Rectangle rectangle,
Color color,
float strokeWidth = 1.0f)
{
var rect = ToNativeRectFPixels(rectangle);
var paint = new Paint()
{
Color = color.ToAndroidColor(),
StrokeWidth = NativeConversions.DevicePixelsToPixels(this.NativeContext, strokeWidth),
AntiAlias = true,
};
paint.SetStyle(Paint.Style.Stroke);
this._canvas.DrawRect(rect, paint);
paint.Dispose();
}
// TODO: Replace with a Shadow property on View
// ANDROID: View.Elevation
public void FillEllipseShadow(
Rectangle rectangle,
Color color,
float shadowBlur = 8.0f)
{
rectangle = rectangle.Inflate(-2 * shadowBlur, -2 * shadowBlur);
var rect = ToNativeRectFPixels(rectangle);
var shadowDp = NativeConversions.DevicePixelsToPixels(this.NativeContext, shadowBlur);
var paint = new Paint()
{
Color = color.ToAndroidColor(),
AntiAlias = true,
};
paint.SetShadowLayer(shadowDp, shadowDp, shadowDp, global::Android.Graphics.Color.Black);
paint.SetStyle(Paint.Style.Fill);
this._canvas.DrawOval(rect, paint);
paint.Dispose();
}
public void DrawText(
string text,
Rectangle bounds,
Color color,
TextFormat textFormat)
{
if (null == textFormat)
{
throw new ArgumentNullException(nameof(textFormat));
}
if (String.IsNullOrEmpty(text))
{
return;
}
var dpBounds = this.ToNativeRectFPixels(bounds);
var paint = new Paint()
{
TextSize = NativeConversions.ScaledPixelsToPixels(this.NativeContext, textFormat.FontSize),
TextAlign = Paint.Align.Left,
Color = color.ToAndroidColor(),
AntiAlias = true,
};
var typeface = GetTypefaceFromTextFormat(textFormat);
paint.SetTypeface(typeface);
float originX;
if (textFormat.HorizontalAlignment == LayoutAlignment.Start)
{
originX = 0;
}
else if (textFormat.HorizontalAlignment == LayoutAlignment.Center)
{
originX = 0.5f;
}
else if (textFormat.HorizontalAlignment == LayoutAlignment.End)
{
originX = 1.0f;
}
else if (textFormat.HorizontalAlignment == LayoutAlignment.Fill)
{
originX = 0.5f;
}
else
{
throw new NotSupportedException("Unsupported alignment.");
}
float originY;
if (textFormat.VerticalAlignment == LayoutAlignment.Start)
{
originY = 0;
}
else if (textFormat.VerticalAlignment == LayoutAlignment.Center)
{
originY = 0.5f;
}
else if (textFormat.VerticalAlignment == LayoutAlignment.End)
{
originY = 1.0f;
}
else if (textFormat.VerticalAlignment == LayoutAlignment.Fill)
{
originY = 0.5f;
}
else
{
throw new NotSupportedException("Unsupported alignment.");
}
float x, y;
if ((originX == 0) && (originY == 0))
{
x = dpBounds.Left;
y = dpBounds.Top;
}
else
{
Rect textBounds = new Rect();
paint.GetTextBounds(text, 0, text.Length, textBounds);
x = ((dpBounds.Width() - textBounds.Width()) * originX) + dpBounds.Left;
y = ((dpBounds.Height() - textBounds.Height()) * originY) + dpBounds.Top;
}
this._canvas.DrawText(text, 0, text.Length, x, y, paint);
}
