/// <summary>
/// generate the path for the border
/// </summary>
/// <param name="paint">the paint object for the path</param>
/// <returns>a skpath representing the border of the floating label entry</returns>
private SKPath GeneratePath(SKPaint paint)
{
var path = new SKPath();
Rectangle viewBounds = SkCanvasView.FromPixels(borderlessEntry.Bounds);
var strokeWidth = (float)SkCanvasView.FromPixels(new Point(0, paint.StrokeWidth)).Y;
float arcHeight = (float)viewBounds.Height + (float)strokeWidth;
var textSize = SkCanvasView.FromPixels(new Size(
width: CalculateBounds.GetTextWidth(borderlessEntry.Placeholder, borderlessEntry.TitleFontSize),
height: CalculateBounds.GetTextHeight(borderlessEntry.Placeholder, borderlessEntry.TitleFontSize)));
// move the point next to the placeholder label
path.MoveTo(
x: (float)viewBounds.X + (float)textSize.Width + 3,
y: (float)viewBounds.Y);
float xCurrent = path.LastPoint.X;
float yCurrent = path.LastPoint.Y;
// line above the entry
path.LineTo((float)viewBounds.Width + (float)viewBounds.X, yCurrent);
xCurrent = path.LastPoint.X;
// draw the arc pointing down (right arc)
path.ArcTo(
oval: new SKRect(xCurrent - arcHeight / 2, yCurrent, xCurrent + arcHeight / 2, yCurrent + arcHeight),
startAngle: -90,
sweepAngle: 180,
forceMoveTo: false);
// draw the line below the entry
path.LineTo((float)viewBounds.X, path.LastPoint.Y);
xCurrent = path.LastPoint.X;
yCurrent = path.LastPoint.Y;
// draw the arc from below entry to above entry (left arc)
path.ArcTo(
oval: new SKRect(xCurrent - arcHeight / 2, yCurrent - arcHeight, xCurrent + arcHeight / 2, yCurrent),
startAngle: 90,
sweepAngle: 180,
forceMoveTo: false);
_borderPath = path;
_strokeDashStart = new DashedStroke(
intervals: new float[] { 0, new SKPathMeasure(_borderPath).Length },
phase: -0);
_strokeDashEnd = new DashedStroke(
intervals: new float[] { new SKPathMeasure(_borderPath).Length, new SKPathMeasure(_borderPath).Length },
phase: -0);
CreateShader();
return(_borderPath);
}
public void Dashed()
{
var p1 = new SPoint(0, 0);
var p2 = new SPoint(10, 0);
var p3 = new SPoint(20, 0);
var p4 = new SPoint(30, 0);
var s = new PolyStroke(new SPoint[] { p1, p2, p3, p4 });
var dashed = new DashedStroke(s, 2);
Assert.AreEqual(2, dashed.Count());
PointListsHelper.AssertPointPresence(dashed, new SPoint[] { p1, p3 });
}
/// <summary>
/// Draw the boarder
/// </summary>
/// <returns></returns>
private async Task PlaceholderToTitleAsync()
{
_strokeDashStart = new DashedStroke(
intervals: new float[] { 0, new SKPathMeasure(_borderPath).Length },
phase: -0);
_strokeDashEnd = new DashedStroke(
intervals: new float[] { new SKPathMeasure(_borderPath).Length, new SKPathMeasure(_borderPath).Length },
phase: -0);
var anim = new DashedStrokeAnimation(
from: _strokeDashStart,
to: _strokeDashEnd,
duration: ANIMATION_DURATION);
await anim.Start((strokeDashToDraw) => SkCanvasView.InvalidateSurface());
}
