protected override void OnRender(DrawingContext drawingContext)
{
if (myRun == null)
return;
Point offset = Point.Empty;
float slack = Width - myRun.Width;
if (myTextAlignment == TextAlignment.Right)
offset.X = slack;
else if (myTextAlignment == TextAlignment.Center)
offset.X = slack / 2;
drawingContext.PushTranslate(offset.X, offset.Y);
drawingContext.DrawGlyphRun(ForeBrush, myRun);
drawingContext.Pop();
}
/// <summary>Draws the text glyph in the specified target area.</summary>
/// <param name="dc">The drawing context to draw on.</param>
/// <param name="foreground">The text foreground brush.</param>
/// <param name="targetArea">The target area where the text is to be drawn (according to the specified alignment).</param>
/// <param name="alignment">Indicates how to align the text with respect to the target area.</param>
public void Draw(DrawingContext dc, Brush foreground, Rect targetArea, TextAlign alignment) {
if (IsEmpty || targetArea.IsEmpty || foreground == null) return;
// compute bounds
var bounds = _computeBounds(targetArea, alignment);
dc.PushTranslate(bounds.X + SharpnessVector.X, bounds.Y + SharpnessVector.Y);
if (TextOverflow == TextOverflow.Ignore || Width <= bounds.Width) {
// ignore overflow - use original glyph run and draw it without clipping
_drawGlyphRun(dc, _fullRun, foreground);
} else if (TextOverflow == TextOverflow.Clip) {
// clip overflow - use original glyph run but clip it to fit bounds
var clipRect = new RectangleGeometry(new Rect(new Point(), bounds.Size));
clipRect.Freeze();
dc.PushClip(clipRect);
_drawGlyphRun(dc, _fullRun, foreground);
dc.Pop();
} else {
// trim overflow - create a trimmed glyph run that fits the bounds and cache it for next invocation
// (the caching of the trimmed glyph is effective only if the width does not change - e.g., when drawing the same glyph in a different color)
if (_trimmedWidth.CertainlyDifferent(bounds.Width)) {
var result = _buildGlyph(false, bounds.Width);
_trimmedRun = (result != null ? result.GlyphRun : null);
_trimmedWidth = bounds.Width;
}
_drawGlyphRun(dc, _trimmedRun, foreground);
}
dc.Pop();
}
/// <summary/>
protected override void OnRender(DrawingContext dc) {
base.OnRender(dc);
if (TickCount <= 0 || Foreground == null) return;
double cx, cy, r0, r1;
if (!ComputeBoundingCircles(out cx, out cy, out r0, out r1)) return;
var a0 = StartAngle;
var a1 = EndAngle;
Gauge.NormalizeAngularRange(ref a0, ref a1);
if (a0.AlmostEquals(a1)) return;
var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
var fontsize = this.IsDefaultValue(FontSizeProperty) ? (r1 - r0) : FontSize;
var format = StringFormat.Nvl("{0}");
Action<double, double> drawText = (double n, double a) => {
var text = new FormattedText(format.Substitute(n), CultureInfo.CurrentUICulture, FlowDirection.LeftToRight, typeface, fontsize, Foreground);
var tw = text.Width;
var th = text.Height;
var tb = fontsize - text.Baseline;
if (!IsRotated) {
var arad = a / 180.0 * Math.PI;
dc.PushRotate(-a, cx, cy - r1 + th / 2.0);
dc.PushTranslate(-Math.Sin(arad) * tw / 2.0, Math.Cos(arad) * th / 2.0);
}
dc.DrawText(text, new Point(cx - tw / 2.0, cy - r1 + tb));
if (!IsRotated) {
dc.Pop();
dc.Pop();
}
};
var pen = GetStrokePen();
if (TickCount == 1) {
dc.PushRotate((a1 + a0) / 2.0, cx, cy);
drawText((Maximum + Minimum) / 2.0, 0);
dc.Pop();
} else {
var v0 = Minimum;
var v1 = Maximum;
Gauge.NormalizeRange(ref v0, ref v1);
var angleDelta = (a1 - a0) / (TickCount - 1);
var valueDelta = (v1 - v0) / (TickCount - 1);
for (var i = 0; i < TickCount; i++) {
if (SkipCount > 0 && (i % SkipCount) == 0) continue;
dc.PushRotate(a0 + i * angleDelta, cx, cy);
drawText(v0 + i * valueDelta, a0 + i * angleDelta);
dc.Pop();
}
}
}
internal void Render(Control control, DrawingContext context)
{
OnRender(context);
myIsVisualValid = true;
if (myChildren == null)
return;
foreach (Control child in myChildren)
{
context.PushTranslate(child.myLeft, child.myTop);
child.Render(child, context);
context.Pop();
}
}
