/// <summary>
/// Creates 18 vertices that create a segment between the two points with the given radius of rounding
/// on the segment end. The color is used to draw the segment.
/// </summary>
/// <param name="from"></param>
/// <param name="to"></param>
/// <param name="radius"></param>
/// <param name="color"></param>
/// <returns>The starting vertex index of the segment.</returns>
public virtual int DrawSegment(CCPoint from, CCPoint to, float radius, CCColor4F color)
{
var cl = new Color(color.R, color.G, color.B, color.A);
var a = from;
var b = to;
var n = CCPoint.Normalize(CCPoint.Perp(a - b));
var t = CCPoint.Perp(n);
var nw = n * radius;
var tw = t * radius;
var v0 = b - (nw + tw);
var v1 = b + (nw - tw);
var v2 = b - nw;
var v3 = b + nw;
var v4 = a - nw;
var v5 = a + nw;
var v6 = a - (nw - tw);
var v7 = a + (nw + tw);
int returnIndex = m_pVertices.Count;
m_pVertices.Add(new VertexPositionColor(v0, cl)); //__t(v2fneg(v2fadd(n, t)))
m_pVertices.Add(new VertexPositionColor(v1, cl)); //__t(v2fsub(n, t))
m_pVertices.Add(new VertexPositionColor(v2, cl)); //__t(v2fneg(n))}
m_pVertices.Add(new VertexPositionColor(v3, cl)); //__t(n)
m_pVertices.Add(new VertexPositionColor(v1, cl)); //__t(v2fsub(n, t))
m_pVertices.Add(new VertexPositionColor(v2, cl)); //__t(v2fneg(n))
m_pVertices.Add(new VertexPositionColor(v3, cl)); //__t(n)
m_pVertices.Add(new VertexPositionColor(v4, cl)); //__t(v2fneg(n))
m_pVertices.Add(new VertexPositionColor(v2, cl)); //__t(v2fneg(n))
m_pVertices.Add(new VertexPositionColor(v3, cl)); //__t(n)
m_pVertices.Add(new VertexPositionColor(v4, cl)); //__t(v2fneg(n))
m_pVertices.Add(new VertexPositionColor(v5, cl)); //__t(n)
m_pVertices.Add(new VertexPositionColor(v6, cl)); //__t(v2fsub(t, n))
m_pVertices.Add(new VertexPositionColor(v4, cl)); //__t(v2fneg(n))
m_pVertices.Add(new VertexPositionColor(v5, cl)); //__t(n)
m_pVertices.Add(new VertexPositionColor(v6, cl)); //__t(v2fsub(t, n))
m_pVertices.Add(new VertexPositionColor(v7, cl)); //__t(v2fadd(n, t))
m_pVertices.Add(new VertexPositionColor(v5, cl)); //__t(n)
m_bDirty = true;
return(returnIndex);
}
public void DrawPolygon(CCPoint[] verts, int count, CCColor4F fillColor, float borderWidth,
CCColor4F borderColor)
{
var extrude = new ExtrudeVerts[count];
for (int i = 0; i < count; i++)
{
var v0 = verts[(i - 1 + count) % count];
var v1 = verts[i];
var v2 = verts[(i + 1) % count];
var n1 = CCPoint.Normalize(CCPoint.Perp(v1 - v0));
var n2 = CCPoint.Normalize(CCPoint.Perp(v2 - v1));
var offset = (n1 + n2) * (1.0f / (CCPoint.Dot(n1, n2) + 1.0f));
extrude[i] = new ExtrudeVerts()
{
offset = offset, n = n2
};
}
bool outline = (fillColor.A > 0.0f && borderWidth > 0.0f);
float inset = (!outline ? 0.5f : 0.0f);
for (int i = 0; i < count - 2; i++)
{
var v0 = verts[0] - (extrude[0].offset * inset);
var v1 = verts[i + 1] - (extrude[i + 1].offset * inset);
var v2 = verts[i + 2] - (extrude[i + 2].offset * inset);
m_pVertices.Add(new VertexPositionColor(v0, fillColor)); //__t(v2fzero)
m_pVertices.Add(new VertexPositionColor(v1, fillColor)); //__t(v2fzero)
m_pVertices.Add(new VertexPositionColor(v2, fillColor)); //__t(v2fzero)
}
for (int i = 0; i < count; i++)
{
int j = (i + 1) % count;
var v0 = verts[i];
var v1 = verts[j];
var n0 = extrude[i].n;
var offset0 = extrude[i].offset;
var offset1 = extrude[j].offset;
if (outline)
{
var inner0 = (v0 - (offset0 * borderWidth));
var inner1 = (v1 - (offset1 * borderWidth));
var outer0 = (v0 + (offset0 * borderWidth));
var outer1 = (v1 + (offset1 * borderWidth));
m_pVertices.Add(new VertexPositionColor(inner0, borderColor)); //__t(v2fneg(n0))
m_pVertices.Add(new VertexPositionColor(inner1, borderColor)); //__t(v2fneg(n0))
m_pVertices.Add(new VertexPositionColor(outer1, borderColor)); //__t(n0)
m_pVertices.Add(new VertexPositionColor(inner0, borderColor)); //__t(v2fneg(n0))
m_pVertices.Add(new VertexPositionColor(outer0, borderColor)); //__t(n0)
m_pVertices.Add(new VertexPositionColor(outer1, borderColor)); //__t(n0)
}
else
{
var inner0 = (v0 - (offset0 * 0.5f));
var inner1 = (v1 - (offset1 * 0.5f));
var outer0 = (v0 + (offset0 * 0.5f));
var outer1 = (v1 + (offset1 * 0.5f));
m_pVertices.Add(new VertexPositionColor(inner0, fillColor)); //__t(v2fzero)
m_pVertices.Add(new VertexPositionColor(inner1, fillColor)); //__t(v2fzero)
m_pVertices.Add(new VertexPositionColor(outer1, fillColor)); //__t(n0)
m_pVertices.Add(new VertexPositionColor(inner0, fillColor)); //__t(v2fzero)
m_pVertices.Add(new VertexPositionColor(outer0, fillColor)); //__t(n0)
m_pVertices.Add(new VertexPositionColor(outer1, fillColor)); //__t(n0)
}
}
m_bDirty = true;
}
private void VertexLineToPolygon(CCPoint[] points, float stroke, CCV3F_C4B_T2F[] vertices, int offset, int nuPoints)
{
nuPoints += offset;
if (nuPoints <= 1)
{
return;
}
stroke *= 0.5f;
int idx;
int nuPointsMinus = nuPoints - 1;
float rad70 = MathHelper.ToRadians(70);
float rad170 = MathHelper.ToRadians(170);
for (int i = offset; i < nuPoints; i++)
{
idx = i * 2;
CCPoint p1 = points[i];
CCPoint perpVector;
if (i == 0)
{
perpVector = CCPoint.Perp(CCPoint.Normalize(p1 - points[i + 1]));
}
else if (i == nuPointsMinus)
{
perpVector = CCPoint.Perp(CCPoint.Normalize(points[i - 1] - p1));
}
else
{
CCPoint p2 = points[i + 1];
CCPoint p0 = points[i - 1];
CCPoint p2p1 = CCPoint.Normalize(p2 - p1);
CCPoint p0p1 = CCPoint.Normalize(p0 - p1);
// Calculate angle between vectors
var angle = (float)Math.Acos(CCPoint.Dot(p2p1, p0p1));
if (angle < rad70)
{
perpVector = CCPoint.Perp(CCPoint.Normalize(CCPoint.Midpoint(p2p1, p0p1)));
}
else if (angle < rad170)
{
perpVector = CCPoint.Normalize(CCPoint.Midpoint(p2p1, p0p1));
}
else
{
perpVector = CCPoint.Perp(CCPoint.Normalize(p2 - p0));
}
}
perpVector = perpVector * stroke;
vertices[idx].Vertices = new CCVertex3F(p1.X + perpVector.X, p1.Y + perpVector.Y, 0);
vertices[idx + 1].Vertices = new CCVertex3F(p1.X - perpVector.X, p1.Y - perpVector.Y, 0);
}
// Validate vertexes
offset = (offset == 0) ? 0 : offset - 1;
for (int i = offset; i < nuPointsMinus; i++)
{
idx = i * 2;
int idx1 = idx + 2;
CCVertex3F p1 = vertices[idx].Vertices;
CCVertex3F p2 = vertices[idx + 1].Vertices;
CCVertex3F p3 = vertices[idx1].Vertices;
CCVertex3F p4 = vertices[idx1 + 1].Vertices;
float s;
bool fixVertex = !ccVertexLineIntersect(p1.X, p1.Y, p4.X, p4.Y, p2.X, p2.Y, p3.X, p3.Y, out s);
if (!fixVertex)
{
if (s < 0.0f || s > 1.0f)
{
fixVertex = true;
}
}
if (fixVertex)
{
vertices[idx1].Vertices = p4;
vertices[idx1 + 1].Vertices = p3;
}
}
}
