public override Brush GetBrush(SvgVisualElement renderingElement, ISvgRenderer renderer, float opacity, bool forStroke = false)
{
LoadStops(renderingElement);
try
{
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
renderer.SetBoundable(renderingElement);
}
// Calculate the path and transform it appropriately
var center = new PointF(NormalizeUnit(CenterX).ToDeviceValue(renderer, UnitRenderingType.Horizontal, this),
NormalizeUnit(CenterY).ToDeviceValue(renderer, UnitRenderingType.Vertical, this));
var focals = new PointF[] { new PointF(NormalizeUnit(FocalX).ToDeviceValue(renderer, UnitRenderingType.Horizontal, this),
NormalizeUnit(FocalY).ToDeviceValue(renderer, UnitRenderingType.Vertical, this)) };
var specifiedRadius = NormalizeUnit(Radius).ToDeviceValue(renderer, UnitRenderingType.Other, this);
var path = new GraphicsPath();
path.AddEllipse(
center.X - specifiedRadius, center.Y - specifiedRadius,
specifiedRadius * 2, specifiedRadius * 2
);
using (var transform = EffectiveGradientTransform)
{
var bounds = renderer.GetBoundable().Bounds;
transform.Translate(bounds.X, bounds.Y, MatrixOrder.Prepend);
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
transform.Scale(bounds.Width, bounds.Height, MatrixOrder.Prepend);
}
path.Transform(transform);
transform.TransformPoints(focals);
}
// Calculate any required scaling
var scaleBounds = RectangleF.Inflate(renderingElement.Bounds, renderingElement.StrokeWidth, renderingElement.StrokeWidth);
var scale = CalcScale(scaleBounds, path);
// Not ideal, but this makes sure that the rest of the shape gets properly filled or drawn
if (scale > 1.0f && SpreadMethod == SvgGradientSpreadMethod.Pad)
{
var stop = Stops.Last();
var origColor = stop.GetColor(renderingElement);
var renderColor = System.Drawing.Color.FromArgb((int)Math.Round(opacity * stop.StopOpacity * 255), origColor);
var origClip = renderer.GetClip();
try
{
using (var solidBrush = new SolidBrush(renderColor))
{
var newClip = origClip.Clone();
newClip.Exclude(path);
renderer.SetClip(newClip);
var renderPath = (GraphicsPath)renderingElement.Path(renderer);
if (forStroke)
{
using (var pen = new Pen(solidBrush, renderingElement.StrokeWidth.ToDeviceValue(renderer, UnitRenderingType.Other, renderingElement)))
{
renderer.DrawPath(pen, renderPath);
}
}
else
{
renderer.FillPath(solidBrush, renderPath);
}
}
}
finally
{
renderer.SetClip(origClip);
}
}
// Get the color blend and any tweak to the scaling
var blend = CalculateColorBlend(renderer, opacity, scale, out scale);
// Transform the path based on the scaling
var gradBounds = path.GetBounds();
var transCenter = new PointF(gradBounds.Left + gradBounds.Width / 2, gradBounds.Top + gradBounds.Height / 2);
using (var scaleMat = new Matrix())
{
scaleMat.Translate(-1 * transCenter.X, -1 * transCenter.Y, MatrixOrder.Append);
scaleMat.Scale(scale, scale, MatrixOrder.Append);
scaleMat.Translate(transCenter.X, transCenter.Y, MatrixOrder.Append);
path.Transform(scaleMat);
}
// calculate the brush
var brush = new PathGradientBrush(path);
brush.CenterPoint = focals[0];
brush.InterpolationColors = blend;
return(brush);
}
finally
{
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
renderer.PopBoundable();
}
}
}
private GraphicsPath GetPath(ISvgRenderer renderer, string text, IList <RectangleF> ranges, bool measureSpaces)
{
EnsureDictionaries();
RectangleF bounds;
SvgGlyph glyph;
SvgKern kern;
GraphicsPath path;
SvgGlyph prevGlyph = null;
Matrix scaleMatrix;
float xPos = 0;
var ascent = Ascent(renderer);
var result = new GraphicsPath();
if (string.IsNullOrEmpty(text))
{
return(result);
}
for (int i = 0; i < text.Length; i++)
{
if (!_glyphs.TryGetValue(text.Substring(i, 1), out glyph))
{
glyph = _font.Descendants().OfType <SvgMissingGlyph>().First();
}
if (prevGlyph != null && _kerning.TryGetValue(prevGlyph.GlyphName + "|" + glyph.GlyphName, out kern))
{
xPos -= kern.Kerning * _emScale;
}
path = (GraphicsPath)glyph.Path(renderer).Clone();
scaleMatrix = new Matrix();
scaleMatrix.Scale(_emScale, -1 * _emScale, MatrixOrder.Append);
scaleMatrix.Translate(xPos, ascent, MatrixOrder.Append);
path.Transform(scaleMatrix);
scaleMatrix.Dispose();
bounds = path.GetBounds();
if (ranges != null)
{
if (measureSpaces && bounds == RectangleF.Empty)
{
ranges.Add(new RectangleF(xPos, 0, glyph.HorizAdvX * _emScale, ascent));
}
else
{
ranges.Add(bounds);
}
}
if (path.PointCount > 0)
{
result.AddPath(path, false);
}
xPos += glyph.HorizAdvX * _emScale;
prevGlyph = glyph;
}
return(result);
}
/// <summary>
/// Common code for rendering a marker once the orientation angle has been calculated
/// </summary>
/// <param name="fAngle"></param>
/// <param name="pRenderer"></param>
/// <param name="pOwner"></param>
/// <param name="pMarkerPoint"></param>
private void RenderPart2(float fAngle, ISvgRenderer pRenderer, SvgVisualElement pOwner, PointF pMarkerPoint)
{
using (var pRenderPen = CreatePen(pOwner, pRenderer))
{
using (var markerPath = GetClone(pOwner))
{
using (var transMatrix = new Matrix())
{
transMatrix.Translate(pMarkerPoint.X, pMarkerPoint.Y);
if (Orient.IsAuto)
{
transMatrix.Rotate(fAngle);
}
else
{
transMatrix.Rotate(Orient.Angle);
}
switch (MarkerUnits)
{
case SvgMarkerUnits.StrokeWidth:
if (ViewBox.Width > 0 && ViewBox.Height > 0)
{
transMatrix.Scale(MarkerWidth, MarkerHeight);
var strokeWidth = pOwner.StrokeWidth.ToDeviceValue(pRenderer, UnitRenderingType.Other, this);
transMatrix.Translate(AdjustForViewBoxWidth(-RefX.ToDeviceValue(pRenderer, UnitRenderingType.Horizontal, this) *
strokeWidth),
AdjustForViewBoxHeight(-RefY.ToDeviceValue(pRenderer, UnitRenderingType.Vertical, this) *
strokeWidth));
}
else
{
// SvgMarkerUnits.UserSpaceOnUse
// TODO: We know this isn't correct.
// But use this until the TODOs from AdjustForViewBoxWidth and AdjustForViewBoxHeight are done.
// MORE see Unit Test "MakerEndTest.TestArrowCodeCreation()"
transMatrix.Translate(-RefX.ToDeviceValue(pRenderer, UnitRenderingType.Horizontal, this),
-RefY.ToDeviceValue(pRenderer, UnitRenderingType.Vertical, this));
}
break;
case SvgMarkerUnits.UserSpaceOnUse:
transMatrix.Translate(-RefX.ToDeviceValue(pRenderer, UnitRenderingType.Horizontal, this),
-RefY.ToDeviceValue(pRenderer, UnitRenderingType.Vertical, this));
break;
}
if (MarkerElement != null && MarkerElement.Transforms != null)
{
foreach (var transformation in MarkerElement.Transforms)
{
transMatrix.Multiply(transformation.Matrix);
}
}
markerPath.Transform(transMatrix);
if (pRenderPen != null)
{
pRenderer.DrawPath(pRenderPen, markerPath);
}
SvgPaintServer pFill = this.Children.First().Fill;
SvgFillRule pFillRule = FillRule; // TODO: What do we use the fill rule for?
float fOpacity = FillOpacity;
if (pFill != null)
{
using (var pBrush = pFill.GetBrush(this, pRenderer, fOpacity))
{
pRenderer.FillPath(pBrush, markerPath);
}
}
}
}
}
}
/// <summary>
/// Sets the path on this element and all child elements. Uses the state
/// object to track the state of the drawing
/// </summary>
/// <param name="state">State of the drawing operation</param>
/// <param name="doMeasurements">If true, calculate and apply text length adjustments.</param>
private void SetPath(TextDrawingState state, bool doMeasurements)
{
TextDrawingState origState = null;
bool alignOnBaseline = state.BaselinePath != null && (this.TextAnchor == SvgTextAnchor.Middle || this.TextAnchor == SvgTextAnchor.End);
if (doMeasurements)
{
if (this.TextLength != SvgUnit.None)
{
origState = state.Clone();
}
else if (alignOnBaseline)
{
origState = state.Clone();
state.BaselinePath = null;
}
}
foreach (var node in GetContentNodes())
{
SvgTextBase textNode = node as SvgTextBase;
if (textNode == null)
{
if (!string.IsNullOrEmpty(node.Content))
{
state.DrawString(PrepareText(node.Content));
}
}
else
{
TextDrawingState newState = new TextDrawingState(state, textNode);
textNode.SetPath(newState);
state.NumChars += newState.NumChars;
state.Current = newState.Current;
}
}
var path = state.GetPath() ?? new GraphicsPath();
// Apply any text length adjustments
if (doMeasurements)
{
if (this.TextLength != SvgUnit.None)
{
var specLength = this.TextLength.ToDeviceValue(state.Renderer, UnitRenderingType.Horizontal, this);
var actLength = state.TextBounds.Width;
var diff = (actLength - specLength);
if (Math.Abs(diff) > 1.5)
{
if (this.LengthAdjust == SvgTextLengthAdjust.Spacing)
{
if (this.X.Count < 2)
{
var numCharDiff = state.NumChars - origState.NumChars - 1;
if (numCharDiff != 0)
{
origState.LetterSpacingAdjust = -1 * diff / numCharDiff;
SetPath(origState, false);
return;
}
}
}
else
{
using (var matrix = new Matrix())
{
matrix.Translate(-1 * state.TextBounds.X, 0, MatrixOrder.Append);
matrix.Scale(specLength / actLength, 1, MatrixOrder.Append);
matrix.Translate(state.TextBounds.X, 0, MatrixOrder.Append);
path.Transform(matrix);
}
}
}
}
else if (alignOnBaseline)
{
var bounds = path.GetBounds();
if (this.TextAnchor == SvgTextAnchor.Middle)
{
origState.StartOffsetAdjust = -1 * bounds.Width / 2;
}
else
{
origState.StartOffsetAdjust = -1 * bounds.Width;
}
SetPath(origState, false);
return;
}
}
_path = path;
this.IsPathDirty = false;
}
private void FlushPath()
{
if (_currPath != null)
{
_currPath.CloseFigure();
// Abort on empty paths (e.g. rendering a space)
if (_currPath.PointCount < 1)
{
_anchoredPaths.Clear();
_xAnchor = float.MinValue;
_currPath = null;
return;
}
if (_xAnchor > float.MinValue)
{
float minX = float.MaxValue;
float maxX = float.MinValue;
RectangleF bounds;
foreach (var path in _anchoredPaths)
{
bounds = path.GetBounds();
if (bounds.Left < minX)
{
minX = bounds.Left;
}
if (bounds.Right > maxX)
{
maxX = bounds.Right;
}
}
var xOffset = 0f; //_xAnchor - minX;
switch (Element.TextAnchor)
{
case SvgTextAnchor.Middle:
if (_anchoredPaths.Count() == 1)
{
xOffset -= this.TextBounds.Width / 2;
}
else
{
xOffset -= (maxX - minX) / 2;
}
break;
case SvgTextAnchor.End:
if (_anchoredPaths.Count() == 1)
{
xOffset -= this.TextBounds.Width;
}
else
{
xOffset -= (maxX - minX);
}
break;
}
if (xOffset != 0)
{
using (var matrix = new Matrix())
{
matrix.Translate(xOffset, 0);
foreach (var path in _anchoredPaths)
{
path.Transform(matrix);
}
}
}
_anchoredPaths.Clear();
_xAnchor = float.MinValue;
}
if (_finalPath == null)
{
_finalPath = _currPath;
}
else
{
_finalPath.AddPath(_currPath, false);
}
_currPath = null;
}
}
