// Start is called before the first frame update
// void Start()
// {
// }
// Update is called once per frame
// void Update()
// {
// }
private List <Vector2> MakeRectangleLineLoop(BoundRect br)
{
var ret = new List <Vector2>(4);
ret.Add(new Vector2(br.left, br.bottom));
ret.Add(new Vector2(br.left, br.top));
ret.Add(new Vector2(br.right, br.top));
ret.Add(new Vector2(br.right, br.bottom));
return(ret);
}
private List <Vector2> MakeRoundRectLineLoop(BoundRect br, float cornerR, float arcMax)
{
int cornerDiv = Mathf.Max(4, (int)Mathf.Ceil(cornerR * Mathf.PI * 0.5f / arcMax));
// Debug.Log("div:" + cornerDiv);
float angle_offset;
var innerCorners = new Vector2[4];
if (br.GetAspectRatio() < 1.0f)
{
angle_offset = 0.0f;
innerCorners[0] = new Vector2(br.right - cornerR, br.top - cornerR);
innerCorners[1] = new Vector2(br.right - cornerR, br.bottom + cornerR);
innerCorners[2] = new Vector2(br.left + cornerR, br.bottom + cornerR);
innerCorners[3] = new Vector2(br.left + cornerR, br.top - cornerR);
}
else
{
angle_offset = Mathf.PI * 0.5f;
innerCorners[0] = new Vector2(br.right - cornerR, br.bottom + cornerR);
innerCorners[1] = new Vector2(br.left + cornerR, br.bottom + cornerR);
innerCorners[2] = new Vector2(br.left + cornerR, br.top - cornerR);
innerCorners[3] = new Vector2(br.right - cornerR, br.top - cornerR);
}
var ret = new List <Vector2>(cornerDiv * 4 + 4);
for (int i = 0; i < 4; i++)
{
Vector2 ip = innerCorners[i];
float base_angle = Mathf.PI * 2.0f * (float)i * 0.25f + angle_offset;
for (int div = 0; div <= cornerDiv; div++)
{
float angle = (float)div / (float)cornerDiv * Mathf.PI * 0.5f + base_angle;
var v = new Vector2(
Mathf.Sin(angle) * cornerR + ip.x,
Mathf.Cos(angle) * cornerR + ip.y
);
ret.Add(v);
}
}
// To make beaty fill mesh.
int lastindex = ret.Count - 1;
var tmpv = ret[lastindex];
ret.RemoveAt(lastindex);
ret.Insert(0, tmpv);
return(ret);
}
private List <Vector2> MakeCapsuleLineLoop(BoundRect br, float arcMax)
{
float capRadius = Mathf.Min(br.GetWidth(), br.GetHeight()) * 0.5f;
int capDiv = Mathf.Max(4, (int)Mathf.Ceil(capRadius * Mathf.PI / arcMax)) & (~0x1);
// Debug.Log("div:" + cornerDiv);
float angle_offset;
var capPivots = new Vector2[4];
if (br.GetAspectRatio() < 1.0f)
{
angle_offset = Mathf.PI * -0.5f;
capPivots[0] = new Vector2((br.left + br.right) * 0.5f, br.top - capRadius);
capPivots[1] = new Vector2((br.left + br.right) * 0.5f, br.bottom + capRadius);
}
else
{
angle_offset = 0.0f;
capPivots[0] = new Vector2(br.right - capRadius, (br.top + br.bottom) * 0.5f);
capPivots[1] = new Vector2(br.left + capRadius, (br.top + br.bottom) * 0.5f);
}
var ret = new List <Vector2>(capDiv * 2 + 2);
for (int i = 0; i < 2; i++)
{
Vector2 cp = capPivots[i];
float base_angle = Mathf.PI * 2.0f * (float)i * 0.5f + angle_offset;
for (int div = 0; div <= capDiv; div++)
{
float angle = (float)div / (float)capDiv * Mathf.PI + base_angle;
var v = new Vector2(
Mathf.Sin(angle) * capRadius + cp.x,
Mathf.Cos(angle) * capRadius + cp.y
);
ret.Add(v);
}
}
// To make beaty fill mesh.
for (int i = 0; i < capDiv / 2; i++)
{
var tmpv = ret[0];
ret.RemoveAt(0);
ret.Add(tmpv);
}
return(ret);
}
private List <Vector2> MakeTrimedRectLineLoop(BoundRect br, float trimW)
{
var ret = new List <Vector2>(4);
ret.Add(new Vector2(br.left, br.bottom + trimW));
ret.Add(new Vector2(br.left, br.top - trimW));
ret.Add(new Vector2(br.left + trimW, br.top));
ret.Add(new Vector2(br.right - trimW, br.top));
ret.Add(new Vector2(br.right, br.top - trimW));
ret.Add(new Vector2(br.right, br.bottom + trimW));
ret.Add(new Vector2(br.right - trimW, br.bottom));
ret.Add(new Vector2(br.left + trimW, br.bottom));
return(ret);
}
private List <Vector2> MakeElipseLineLoop(BoundRect br, float arcMax)
{
// Ellipse parameters
float a = br.GetWidth() * 0.5f; // x radius
float b = br.GetHeight() * 0.5f; // y radius
float h = ((a - b) * (a - b)) / ((a + b) * (a + b));
float c = Mathf.PI * (a + b) * (1.0f + 3.0f * h / (10.0f + Mathf.Sqrt(4.0f - 3.0f * h))); // Ramanujan's approximation.
// Debug.Log("h:" + h + ", c:" + c);
int DIV = Mathf.Max(8, (int)Mathf.Ceil(c / arcMax)) & (~0x1);
var ret = new List <Vector2>(DIV);
float cx = (br.left + br.right) * 0.5f;
float cy = (br.bottom + br.top) * 0.5f;
float angle_offset = (a < b) ? 0.0f : (Mathf.PI * 0.5f);
for (int i = 0; i < DIV; i++)
{
float angle = (float)i / (float)DIV * Mathf.PI * 2.0f + angle_offset;
ret.Add(new Vector2(Mathf.Sin(angle) * a + cx, Mathf.Cos(angle) * b + cy));
}
return(ret);
}
protected override void OnPopulateMesh(VertexHelper vh)
{
var rect = GetPixelAdjustedRect();
var shapebounds = new BoundRect(
rect.yMax - margin.top,
rect.xMax - margin.right,
rect.yMin + margin.bottom,
rect.xMin + margin.left
);
if (shapebounds.GetWidth() < 0.0f || shapebounds.GetHeight() < 0.0f)
{
vh.Clear();
return;
}
// Vertices list is clock wise.
List <Vector2> verts;
switch (shapeType)
{
default:
case ShapeType.Rectangle:
verts = MakeRectangleLineLoop(shapebounds);
break;
case ShapeType.Ellipse:
verts = MakeElipseLineLoop(shapebounds, maxArcLength);
break;
case ShapeType.Capsule:
verts = MakeCapsuleLineLoop(shapebounds, maxArcLength);
break;
case ShapeType.RoundRect:
verts = MakeRoundRectLineLoop(shapebounds, cornerRadius, maxArcLength);
break;
case ShapeType.TrimedRect:
verts = MakeTrimedRectLineLoop(shapebounds, cornerRadius);
break;
}
// var verts = MakeRectangleLineLoop(shapebounds);
// var verts = MakeElipseLineLoop(shapebounds);
// var verts = MakeCapsuleLineLoop(shapebounds);
// var verts = MakeRoundRectLineLoop(shapebounds);
RemoveDegenerateEdges(verts, 0.1f);
vh.Clear();
if (borderWidth > 0.0f)
{
// Inset loop
var insetverts = MakeInsetLineLoop(verts, borderWidth);
// Create border
BridgeFillLineLoops(vh, borderColor, insetverts, verts, shapebounds);
// Fill shape
FillConvexLineLoop(vh, color, insetverts, shapebounds);
}
else
{
// Fill shape
FillConvexLineLoop(vh, color, verts, shapebounds);
}
}
private void FillConvexLineLoop(VertexHelper vh, Color col, List <Vector2> verts, BoundRect br)
{
int vstart = vh.currentVertCount;
// Add vertices
UIVertex uivert = UIVertex.simpleVert;
float bw = br.GetWidth();
float bh = br.GetHeight();
foreach (Vector2 v in verts)
{
float tx = (v.x - br.left) / bw;
float ty = (v.y - br.bottom) / bh;
uivert.position = new Vector2(v.x, v.y);
uivert.uv0 = new Vector2(tx, ty);
uivert.color = col;
vh.AddVert(uivert);
// iv++;
}
// Add faces
int i0 = 0 + vstart;
int i1 = 1 + vstart;
int vcount = verts.Count;
for (int i = 0; i < vcount - 2; i++)
{
int i2;
if ((i & 1) == 0)
{
i2 = vcount - 1 - i / 2 + vstart;
vh.AddTriangle(i0, i1, i2);
}
else
{
i2 = 2 + i / 2 + vstart;
vh.AddTriangle(i1, i0, i2);
}
i0 = i1;
i1 = i2;
}
}
private void BridgeFillLineLoops(VertexHelper vh, Color col, List <Vector2> innerVerts, List <Vector2> outerVerts, BoundRect br)
{
// Debug.Assert(outerVerts.Count == innerVerts.Count, "BridgeFillLineLoops: different size verts.");
int vstart = vh.currentVertCount;
// Add vertices
UIVertex uivert = UIVertex.simpleVert;
float bw = br.GetWidth();
float bh = br.GetHeight();
UIVertex[] uiv01 = new UIVertex[2];
for (int i = 0; i < outerVerts.Count; i++)
{
for (int j = 0; j < 2; j++)
{
var v = (j == 0)? innerVerts[i] : outerVerts[i];
float tx = (v.x - br.left) / bw;
float ty = (v.y - br.bottom) / bh;
uivert.position = new Vector2(v.x, v.y);
uivert.uv0 = new Vector2(tx, ty);
uivert.color = col;
vh.AddVert(uivert);
if (i == 0)
{
uiv01[j] = uivert;
}
}
}
vh.AddVert(uiv01[0]);
vh.AddVert(uiv01[1]);
// Add faces
int i0 = 0 + vstart;
int i1 = 1 + vstart;
int vcount = outerVerts.Count * 2 + 2;
for (int i = 2; i < vcount; i++)
{
int i2 = i + vstart;
if ((i & 1) == 0)
{
vh.AddTriangle(i0, i1, i2);
}
else
{
vh.AddTriangle(i1, i0, i2);
}
i0 = i1;
i1 = i2;
}
}