//internal InsetOutsetCount ComputeBevel (CCVector2 a, CCVector2 b, CCVector2 c, PenWorkspace ws)
internal InsetOutsetCount ComputeBevel(ref JoinSample js, PenWorkspace ws)
{
CCVector2 a = js.PointA;
CCVector2 b = js.PointB;
CCVector2 c = js.PointC;
CCVector2 edgeBA = new CCVector2(a.X - b.X, a.Y - b.Y);
CCVector2 edgeBC = new CCVector2(c.X - b.X, c.Y - b.Y);
double dot = CCVector2.Dot(edgeBA, edgeBC);
if (dot < 0)
{
double den = edgeBA.LengthSquared() * edgeBC.LengthSquared();
double cos2 = (dot * dot) / den;
if (cos2 > _joinLimitCos2)
{
return(ComputeMiter(ref js, ws));
}
}
CCVector2 edgeAB = new CCVector2(b.X - a.X, b.Y - a.Y);
edgeAB.Normalize();
CCVector2 edgeABt = new CCVector2(-edgeAB.Y, edgeAB.X);
edgeBC.Normalize();
CCVector2 edgeBCt = new CCVector2(-edgeBC.Y, edgeBC.X);
CCVector2 pointA = a;
CCVector2 pointC = c;
short vertexCount = 0;
if (Cross2D(edgeAB, edgeBC) > 0)
{
switch (Alignment)
{
case PenAlignment.Center:
float w2 = Width / 2;
pointA = new CCVector2(a.X - w2 * edgeABt.X, a.Y - w2 * edgeABt.Y);
pointC = new CCVector2(c.X - w2 * edgeBCt.X, c.Y - w2 * edgeBCt.Y);
ws.XYInsetBuffer[0] = new CCVector2(b.X + w2 * edgeABt.X, b.Y + w2 * edgeABt.Y);
ws.XYInsetBuffer[1] = new CCVector2(b.X + w2 * edgeBCt.X, b.Y + w2 * edgeBCt.Y);
vertexCount = 2;
break;
case PenAlignment.Inset:
ws.XYInsetBuffer[0] = new CCVector2(b.X + Width * edgeABt.X, b.Y + Width * edgeABt.Y);
ws.XYInsetBuffer[1] = new CCVector2(b.X + Width * edgeBCt.X, b.Y + Width * edgeBCt.Y);
vertexCount = 2;
break;
case PenAlignment.Outset:
pointA = new CCVector2(a.X - Width * edgeABt.X, a.Y - Width * edgeABt.Y);
pointC = new CCVector2(c.X - Width * edgeBCt.X, c.Y - Width * edgeBCt.Y);
ws.XYInsetBuffer[0] = b;
vertexCount = 1;
break;
}
CCVector2 point5;
float tdiv = CCVector2.Dot(edgeBCt, edgeAB);
if (Math.Abs(tdiv) < 0.0005f)
{
point5 = new CCVector2((pointA.X + pointC.X) / 2, (pointA.Y + pointC.Y) / 2);
}
else
{
float offset35 = CCVector2.Dot(edgeBCt, pointC);
float t5 = (offset35 - CCVector2.Dot(edgeBCt, pointA)) / tdiv;
point5 = new CCVector2(pointA.X + t5 * edgeAB.X, pointA.Y + t5 * edgeAB.Y);
}
ws.XYOutsetBuffer[0] = point5;
ws.UVOutsetBuffer[0] = new CCVector2(1, js.LengthB);
for (int i = 0; i < vertexCount; i++)
{
ws.UVInsetBuffer[i] = new CCVector2(0, js.LengthB);
}
return(new InsetOutsetCount(vertexCount, 1, false));
}
else
{
switch (Alignment)
{
case PenAlignment.Center:
float w2 = Width / 2;
pointA = new CCVector2(a.X + w2 * edgeABt.X, a.Y + w2 * edgeABt.Y);
pointC = new CCVector2(c.X + w2 * edgeBCt.X, c.Y + w2 * edgeBCt.Y);
ws.XYOutsetBuffer[0] = new CCVector2(b.X - w2 * edgeABt.X, b.Y - w2 * edgeABt.Y);
ws.XYOutsetBuffer[1] = new CCVector2(b.X - w2 * edgeBCt.X, b.Y - w2 * edgeBCt.Y);
vertexCount = 2;
break;
case PenAlignment.Inset:
pointA = new CCVector2(a.X + Width * edgeABt.X, a.Y + Width * edgeABt.Y);
pointC = new CCVector2(c.X + Width * edgeBCt.X, c.Y + Width * edgeBCt.Y);
ws.XYOutsetBuffer[0] = b;
vertexCount = 1;
break;
case PenAlignment.Outset:
ws.XYOutsetBuffer[0] = new CCVector2(b.X - Width * edgeABt.X, b.Y - Width * edgeABt.Y);
ws.XYOutsetBuffer[1] = new CCVector2(b.X - Width * edgeBCt.X, b.Y - Width * edgeBCt.Y);
vertexCount = 2;
break;
}
CCVector2 point0;
float tdiv = CCVector2.Dot(edgeBCt, edgeAB);
if (Math.Abs(tdiv) < 0.0005f)
{
point0 = new CCVector2((pointA.X + pointC.X) / 2, (pointA.Y + pointC.Y) / 2);
}
else
{
float offset01 = CCVector2.Dot(edgeBCt, pointC);
float t0 = (offset01 - CCVector2.Dot(edgeBCt, pointA)) / tdiv;
point0 = new CCVector2(pointA.X + t0 * edgeAB.X, pointA.Y + t0 * edgeAB.Y);
}
ws.XYInsetBuffer[0] = point0;
ws.UVInsetBuffer[0] = new CCVector2(0, js.LengthB);
for (int i = 0; i < vertexCount; i++)
{
ws.UVOutsetBuffer[i] = new CCVector2(1, js.LengthB);
}
return(new InsetOutsetCount(1, vertexCount, true));
}
}
//internal InsetOutsetCount ComputeMiter (CCVector2 a, CCVector2 b, CCVector2 c, PenWorkspace ws)
internal InsetOutsetCount ComputeMiter(ref JoinSample js, PenWorkspace ws)
{
CCVector2 a = js.PointA;
CCVector2 b = js.PointB;
CCVector2 c = js.PointC;
CCVector2 edgeAB = new CCVector2(b.X - a.X, b.Y - a.Y);
edgeAB.Normalize();
CCVector2 edgeABt = new CCVector2(-edgeAB.Y, edgeAB.X);
CCVector2 edgeBC = new CCVector2(c.X - b.X, c.Y - b.Y);
edgeBC.Normalize();
CCVector2 edgeBCt = new CCVector2(-edgeBC.Y, edgeBC.X);
CCVector2 point1, point2, point3, point4;
switch (Alignment)
{
case PenAlignment.Center:
float w2 = Width / 2;
point2 = new CCVector2(a.X + w2 * edgeABt.X, a.Y + w2 * edgeABt.Y);
point4 = new CCVector2(a.X - w2 * edgeABt.X, a.Y - w2 * edgeABt.Y);
point1 = new CCVector2(c.X + w2 * edgeBCt.X, c.Y + w2 * edgeBCt.Y);
point3 = new CCVector2(c.X - w2 * edgeBCt.X, c.Y - w2 * edgeBCt.Y);
break;
case PenAlignment.Inset:
point2 = new CCVector2(a.X + Width * edgeABt.X, a.Y + Width * edgeABt.Y);
point4 = a;
point1 = new CCVector2(c.X + Width * edgeBCt.X, c.Y + Width * edgeBCt.Y);
point3 = c;
break;
case PenAlignment.Outset:
point2 = a;
point4 = new CCVector2(a.X - Width * edgeABt.X, a.Y - Width * edgeABt.Y);
point1 = c;
point3 = new CCVector2(c.X - Width * edgeBCt.X, c.Y - Width * edgeBCt.Y);
break;
default:
point2 = CCVector2.Zero;
point4 = CCVector2.Zero;
point1 = CCVector2.Zero;
point3 = CCVector2.Zero;
break;
}
CCVector2 point0, point5;
float tdiv = CCVector2.Dot(edgeBCt, edgeAB);
if (Math.Abs(tdiv) < .0005f)
{
point0 = new CCVector2((point2.X + point1.X) / 2, (point2.Y + point1.Y) / 2);
point5 = new CCVector2((point4.X + point3.X) / 2, (point4.Y + point3.Y) / 2);
}
else
{
float offset01 = CCVector2.Dot(edgeBCt, point1);
float t0 = (offset01 - CCVector2.Dot(edgeBCt, point2)) / tdiv;
float offset35 = CCVector2.Dot(edgeBCt, point3);
float t5 = (offset35 - CCVector2.Dot(edgeBCt, point4)) / tdiv;
point0 = new CCVector2(point2.X + t0 * edgeAB.X, point2.Y + t0 * edgeAB.Y);
point5 = new CCVector2(point4.X + t5 * edgeAB.X, point4.Y + t5 * edgeAB.Y);
}
double miterLimit = MiterLimit * Width;
if ((point0 - point5).LengthSquared() > miterLimit * miterLimit)
{
return(ComputeBevel(ref js, ws));
}
ws.XYInsetBuffer[0] = point0;
ws.XYOutsetBuffer[0] = point5;
ws.UVInsetBuffer[0] = new CCVector2(0, js.LengthB);
ws.UVOutsetBuffer[0] = new CCVector2(1, js.LengthB);
return(new InsetOutsetCount(1, 1));
}