public void OnPopulateMesh(VertexBuffer vb)
{
Rect rect = drawRect != null ? (Rect)drawRect : vb.contentRect;
Color32 color = fillColor != null ? (Color32)fillColor : vb.vertexColor;
float sectionStart = Mathf.Clamp(startDegree, 0, 360);
float sectionEnd = Mathf.Clamp(endDegreee, 0, 360);
bool clipped = sectionStart > 0 || sectionEnd < 360;
sectionStart = sectionStart * Mathf.Deg2Rad;
sectionEnd = sectionEnd * Mathf.Deg2Rad;
Color32 centerColor2 = centerColor == null ? color : (Color32)centerColor;
float radiusX = rect.width / 2;
float radiusY = rect.height / 2;
int sides = Mathf.CeilToInt(Mathf.PI * (radiusX + radiusY) / 4);
sides = Mathf.Clamp(sides, 40, 800);
float angleDelta = 2 * Mathf.PI / sides;
float angle = 0;
float lineAngle = 0;
if (lineWidth > 0 && clipped)
{
lineAngle = lineWidth / Mathf.Max(radiusX, radiusY);
sectionStart += lineAngle;
sectionEnd -= lineAngle;
}
int vpos = vb.currentVertCount;
float centerX = rect.x + radiusX;
float centerY = rect.y + radiusY;
vb.AddVert(new Vector3(centerX, centerY, 0), centerColor2);
for (int i = 0; i < sides; i++)
{
if (angle < sectionStart)
{
angle = sectionStart;
}
else if (angle > sectionEnd)
{
angle = sectionEnd;
}
Vector3 vec = new Vector3(Mathf.Cos(angle) * (radiusX - lineWidth) + centerX, Mathf.Sin(angle) * (radiusY - lineWidth) + centerY, 0);
vb.AddVert(vec, color);
if (lineWidth > 0)
{
vb.AddVert(vec, lineColor);
vb.AddVert(new Vector3(Mathf.Cos(angle) * radiusX + centerX, Mathf.Sin(angle) * radiusY + centerY, 0), lineColor);
}
angle += angleDelta;
}
if (lineWidth > 0)
{
int cnt = sides * 3;
for (int i = 0; i < cnt; i += 3)
{
if (i != cnt - 3)
{
vb.AddTriangle(0, i + 1, i + 4);
vb.AddTriangle(i + 5, i + 2, i + 3);
vb.AddTriangle(i + 3, i + 6, i + 5);
}
else if (!clipped)
{
vb.AddTriangle(0, i + 1, 1);
vb.AddTriangle(2, i + 2, i + 3);
vb.AddTriangle(i + 3, 3, 2);
}
else
{
vb.AddTriangle(0, i + 1, i + 1);
vb.AddTriangle(i + 2, i + 2, i + 3);
vb.AddTriangle(i + 3, i + 3, i + 2);
}
}
}
else
{
for (int i = 0; i < sides; i++)
{
if (i != sides - 1)
{
vb.AddTriangle(0, i + 1, i + 2);
}
else if (!clipped)
{
vb.AddTriangle(0, i + 1, 1);
}
else
{
vb.AddTriangle(0, i + 1, i + 1);
}
}
}
if (lineWidth > 0 && clipped)
{
//扇形内边缘的线条
vb.AddVert(new Vector3(radiusX, radiusY, 0), lineColor);
float centerRadius = lineWidth * 0.5f;
sectionStart -= lineAngle;
angle = sectionStart + lineAngle * 0.5f + Mathf.PI * 0.5f;
vb.AddVert(new Vector3(Mathf.Cos(angle) * centerRadius + radiusX, Mathf.Sin(angle) * centerRadius + radiusY, 0), lineColor);
angle -= Mathf.PI;
vb.AddVert(new Vector3(Mathf.Cos(angle) * centerRadius + radiusX, Mathf.Sin(angle) * centerRadius + radiusY, 0), lineColor);
vb.AddVert(new Vector3(Mathf.Cos(sectionStart) * radiusX + radiusX, Mathf.Sin(sectionStart) * radiusY + radiusY, 0), lineColor);
vb.AddVert(vb.GetPosition(vpos + 3), lineColor);
sectionEnd += lineAngle;
angle = sectionEnd - lineAngle * 0.5f + Mathf.PI * 0.5f;
vb.AddVert(new Vector3(Mathf.Cos(angle) * centerRadius + radiusX, Mathf.Sin(angle) * centerRadius + radiusY, 0), lineColor);
angle -= Mathf.PI;
vb.AddVert(new Vector3(Mathf.Cos(angle) * centerRadius + radiusX, Mathf.Sin(angle) * centerRadius + radiusY, 0), lineColor);
vb.AddVert(vb.GetPosition(vpos + sides * 3), lineColor);
vb.AddVert(new Vector3(Mathf.Cos(sectionEnd) * radiusX + radiusX, Mathf.Sin(sectionEnd) * radiusY + radiusY, 0), lineColor);
vb.AddTriangles(SECTOR_CENTER_TRIANGLES, sides * 3 + 1);
}
}
//12 vertex
static void FillRadial360(VertexBuffer vb, Rect vertRect, Origin360 origin, float amount, bool clockwise)
{
switch (origin)
{
case Origin360.Top:
if (amount < 0.5f)
{
vertRect.width /= 2;
if (clockwise)
{
vertRect.x += vertRect.width;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Left : Origin180.Right, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-8);
vb.AddQuad(new Rect(vec.x, vec.y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.width /= 2;
if (!clockwise)
{
vertRect.x += vertRect.width;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Right : Origin180.Left, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.x += vertRect.width;
}
else
{
vertRect.x -= vertRect.width;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin360.Bottom:
if (amount < 0.5f)
{
vertRect.width /= 2;
if (!clockwise)
{
vertRect.x += vertRect.width;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Right : Origin180.Left, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-8);
vb.AddQuad(new Rect(vec.x, vec.y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.width /= 2;
if (clockwise)
{
vertRect.x += vertRect.width;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Left : Origin180.Right, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.x -= vertRect.width;
}
else
{
vertRect.x += vertRect.width;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin360.Left:
if (amount < 0.5f)
{
vertRect.height /= 2;
if (!clockwise)
{
vertRect.y += vertRect.height;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Bottom : Origin180.Top, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-8);
vb.AddQuad(new Rect(vec.x, vec.y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.height /= 2;
if (clockwise)
{
vertRect.y += vertRect.height;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Top : Origin180.Bottom, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.y -= vertRect.height;
}
else
{
vertRect.y += vertRect.height;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin360.Right:
if (amount < 0.5f)
{
vertRect.height /= 2;
if (clockwise)
{
vertRect.y += vertRect.height;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Top : Origin180.Bottom, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-8);
vb.AddQuad(new Rect(vec.x, vec.y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.height /= 2;
if (!clockwise)
{
vertRect.y += vertRect.height;
}
FillRadial180(vb, vertRect, clockwise ? Origin180.Bottom : Origin180.Top, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.y += vertRect.height;
}
else
{
vertRect.y -= vertRect.height;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
}
}
//8 vertex
static void FillRadial180(VertexBuffer vb, Rectangle vertRect, Origin180 origin, float amount, bool clockwise)
{
switch (origin)
{
case Origin180.Top:
if (amount <= 0.5f)
{
vertRect.Width /= 2;
if (clockwise)
{
vertRect.X += vertRect.Width;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.TopLeft : Origin90.TopRight, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-4);
vb.AddQuad(new Rectangle(vec.X, vec.Y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.Width /= 2;
if (!clockwise)
{
vertRect.X += vertRect.Width;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.TopRight : Origin90.TopLeft, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.X += vertRect.Width;
}
else
{
vertRect.X -= vertRect.Width;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin180.Bottom:
if (amount <= 0.5f)
{
vertRect.Width /= 2;
if (!clockwise)
{
vertRect.X += vertRect.Width;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.BottomRight : Origin90.BottomLeft, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-4);
vb.AddQuad(new Rectangle(vec.X, vec.Y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.Width /= 2;
if (clockwise)
{
vertRect.X += vertRect.Width;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.BottomLeft : Origin90.BottomRight, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.X -= vertRect.Width;
}
else
{
vertRect.X += vertRect.Width;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin180.Left:
if (amount <= 0.5f)
{
vertRect.Height /= 2;
if (!clockwise)
{
vertRect.Y += vertRect.Height;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.BottomLeft : Origin90.TopLeft, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-4);
vb.AddQuad(new Rectangle(vec.X, vec.Y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.Height /= 2;
if (clockwise)
{
vertRect.Y += vertRect.Height;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.TopLeft : Origin90.BottomLeft, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.Y -= vertRect.Height;
}
else
{
vertRect.Y += vertRect.Height;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
case Origin180.Right:
if (amount <= 0.5f)
{
vertRect.Height /= 2;
if (clockwise)
{
vertRect.Y += vertRect.Height;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.TopRight : Origin90.BottomRight, amount / 0.5f, clockwise);
Vector3 vec = vb.GetPosition(-4);
vb.AddQuad(new Rectangle(vec.X, vec.Y, 0, 0));
vb.AddTriangles(-4);
}
else
{
vertRect.Height /= 2;
if (!clockwise)
{
vertRect.Y += vertRect.Height;
}
FillRadial90(vb, vertRect, clockwise ? Origin90.BottomRight : Origin90.TopRight, (amount - 0.5f) / 0.5f, clockwise);
if (clockwise)
{
vertRect.Y += vertRect.Height;
}
else
{
vertRect.Y -= vertRect.Height;
}
vb.AddQuad(vertRect);
vb.AddTriangles(-4);
}
break;
}
}
