void EnsureMesh(ICanvasResourceCreator resourceCreator)
{
if (gradientMesh != null) return;
CanvasGradientMeshPatch[] patchArray = new CanvasGradientMeshPatch[patchPoints.Count];
for (int i=0; i<patchPoints.Count; ++i)
{
CanvasGradientMeshPatch patch;
var points = patchPoints[i];
var colors = new Vector4[] { Color00.Color, Color03.Color, Color30.Color, Color33.Color };
var edges = new CanvasGradientMeshPatchEdge[] { Edge00To03, Edge03To33, Edge33To30, Edge30To00 };
if (patchPoints[i].Length == 12)
{
patch = CanvasGradientMesh.CreateCoonsPatch(points, colors, edges);
}
else
{
Debug.Assert(patchPoints[i].Length == 16);
patch = CanvasGradientMesh.CreateTensorPatch(points, colors, edges);
}
patchArray[i] = patch;
}
// Gradient meshes are allowed to be zero-sized, so there is no need to
// account for zero here.
gradientMesh = new CanvasGradientMesh(resourceCreator, patchArray);
}
private void CanvasAnimatedControl_OnCreateResources(CanvasAnimatedControl sender, CanvasCreateResourcesEventArgs args)
{
//guides
_center = new Vector2((float)(sender.Size.Width / 2.0), (float)(sender.Size.Height / 2.0f));
_size = (float) Math.Min(sender.Size.Height, sender.Size.Width);
_half = _size / 2.0f;
_ringCount = Convert.ToInt32(Math.Floor((_half - (StartOffset + EndOffset))/(RingPadding + RingStrokeWidth)));
var nudge = _size * 0.174f;
//mask
var crt = new CanvasRenderTarget(sender, _size, _size, sender.Dpi);
using (var session = crt.CreateDrawingSession())
{
session.Clear(new Vector4(0, 0, 0, 0));
var pa = new CanvasGradientMeshPatch[4];
pa[0] = CanvasGradientMesh.CreateCoonsPatch(
new[]
{
new Vector2(_half, 0.0f), //center top
new Vector2(_half, 0.0f), //center top
new Vector2(_size, 0.0f), //right top
new Vector2(_size, _half), //right middle
new Vector2(_half-nudge, _half), //center middle (nudged left)
new Vector2(_half-nudge, _half), //center middle (nudged left)
new Vector2(_size, _half), //right middle
new Vector2(_size, _size), //right bottom
new Vector2(_half, _size), //center bottom
new Vector2(_half, _size), //center bottom
new Vector2(-nudge, _size), //left bottom (nudged left)
new Vector2(-nudge, 0.0f), //left top (nudged left)
},
new[]
{
new Vector4(1, 1, 1, 1), new Vector4(1, 1, 1, 1),
new Vector4(0, 0, 0, 0), new Vector4(0, 0, 0, 0),
},
new[]
{
CanvasGradientMeshPatchEdge.Antialiased, CanvasGradientMeshPatchEdge.Antialiased,
CanvasGradientMeshPatchEdge.Antialiased, CanvasGradientMeshPatchEdge.Antialiased
});
var gm = new CanvasGradientMesh(session, pa);
session.DrawGradientMesh(gm);
}
var ib = new CanvasImageBrush(sender, crt);
_brush = ib;
//animation pattern
_pattern = new List<double>();
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < _ringCount; j++)
{
_pattern.Add(0.0);
}
}
for (int i = 0; i < _ringCount; i++)
{
_pattern.Add((1.0/_ringCount)*(i + 1));
}
for (int i = _ringCount - 1; i > 0; i--)
{
_pattern.Add((1.0 / _ringCount) * (i));
}
for (int j = 0; j < _ringCount; j++)
{
_pattern.Add(0.0);
}
}