//---------------------------------------------------------------------
public void DrawArc(
float fromX, float fromY, float endX, float endY,
float xaxisRotationAngleDec, float rx, float ry,
SvgArcSize arcSize, SvgArcSweep arcSweep)
{
//------------------
//SVG Elliptical arc ...
//from Apache Batik
//-----------------
CenterFormArc centerFormArc = new CenterFormArc();
ComputeArc2(fromX, fromY, rx, ry,
AggMath.deg2rad(xaxisRotationAngleDec),
arcSize == SvgArcSize.Large,
arcSweep == SvgArcSweep.Negative,
endX, endY, ref centerFormArc);
//
using (VectorToolBox.Borrow(out Arc arcTool))
using (VxsTemp.Borrow(out var v1, out var v2, out var v3))
{
arcTool.Init(centerFormArc.cx, centerFormArc.cy, rx, ry,
centerFormArc.radStartAngle,
(centerFormArc.radStartAngle + centerFormArc.radSweepDiff));
bool stopLoop = false;
foreach (VertexData vertexData in arcTool.GetVertexIter())
{
switch (vertexData.command)
{
case VertexCmd.NoMore:
stopLoop = true;
break;
default:
v1.AddVertex(vertexData.x, vertexData.y, vertexData.command);
//yield return vertexData;
break;
}
//------------------------------
if (stopLoop)
{
break;
}
}
double scaleRatio = 1;
if (centerFormArc.scaleUp)
{
int vxs_count = v1.Count;
double px0, py0, px_last, py_last;
v1.GetVertex(0, out px0, out py0);
v1.GetVertex(vxs_count - 1, out px_last, out py_last);
double distance1 = Math.Sqrt((px_last - px0) * (px_last - px0) + (py_last - py0) * (py_last - py0));
double distance2 = Math.Sqrt((endX - fromX) * (endX - fromX) + (endY - fromY) * (endY - fromY));
if (distance1 < distance2)
{
scaleRatio = distance2 / distance1;
}
else
{
}
}
if (xaxisRotationAngleDec != 0)
{
//also rotate
if (centerFormArc.scaleUp)
{
//var mat = Affine.NewMatix(
// new AffinePlan(AffineMatrixCommand.Translate, -centerFormArc.cx, -centerFormArc.cy),
// new AffinePlan(AffineMatrixCommand.Scale, scaleRatio, scaleRatio),
// new AffinePlan(AffineMatrixCommand.Rotate, DegToRad(xaxisRotationAngleDec)),
// new AffinePlan(AffineMatrixCommand.Translate, centerFormArc.cx, centerFormArc.cy));
//mat1.TransformToVxs(v1, v2);
//v1 = v2;
AffineMat mat = AffineMat.Iden;
mat.Translate(-centerFormArc.cx, -centerFormArc.cy);
mat.Scale(scaleRatio);
mat.RotateDeg(xaxisRotationAngleDec);
mat.Translate(centerFormArc.cx, centerFormArc.cy);
VertexStoreTransformExtensions.TransformToVxs(ref mat, v1, v2);
v1 = v2;
}
else
{
//not scale
//var mat = Affine.NewMatix(
// AffinePlan.Translate(-centerFormArc.cx, -centerFormArc.cy),
// AffinePlan.RotateDeg(xaxisRotationAngleDec),
// AffinePlan.Translate(centerFormArc.cx, centerFormArc.cy));
//mat.TransformToVxs(v1, v2);
//v1 = v2;
AffineMat mat = AffineMat.Iden;
mat.Translate(-centerFormArc.cx, -centerFormArc.cy);
mat.RotateDeg(xaxisRotationAngleDec);
mat.Translate(centerFormArc.cx, centerFormArc.cy);
VertexStoreTransformExtensions.TransformToVxs(ref mat, v1, v2);
v1 = v2;
}
}
else
{
//no rotate
if (centerFormArc.scaleUp)
{
//var mat = Affine.NewMatix(
// new AffinePlan(AffineMatrixCommand.Translate, -centerFormArc.cx, -centerFormArc.cy),
// new AffinePlan(AffineMatrixCommand.Scale, scaleRatio, scaleRatio),
// new AffinePlan(AffineMatrixCommand.Translate, centerFormArc.cx, centerFormArc.cy));
//mat.TransformToVxs(v1, v2);
//v1 = v2;
AffineMat mat = AffineMat.Iden;
mat.Translate(-centerFormArc.cx, -centerFormArc.cy);
mat.RotateDeg(scaleRatio);
mat.Translate(centerFormArc.cx, centerFormArc.cy);
//
VertexStoreTransformExtensions.TransformToVxs(ref mat, v1, v2);
v1 = v2;
}
}
//_stroke.Width = this.StrokeWidth;
//_stroke.MakeVxs(v1, v3);
//_pcx.DrawGfxPath(_pcx.StrokeColor, _pathRenderVxBuilder.CreatePathRenderVx(v3));
}
}
