protected override void OnPopulateMesh(VertexHelper vh)
{
if (color.a * 256f < 5)
{
vh.Clear();
return; // dont draw anything if transparent
}
base.OnPopulateMesh(vh);
if (Mirror == MirrorType.None &&
m_rotate <= 0 &&
m_skew == Vector2.zero &&
gradientDirection == Vector2.zero) // condition of shape changes
{
return;
}
// var vs = new List<UIVertex>();
// var vsNew = new List<UIVertex>(vs.Count);
// vh.GetUIVertexStream(vs);
// vh.Clear();
var rect = GetPixelAdjustedRect();
Easing gradientEaseCurve = null;
var gradientDir = Vector2.zero;
var gradientStart = 0f;
var gradientDistance = 1f;
if (gradientDirection != Vector2.zero)
{
gradientEaseCurve = StandardEase.Get(gradientEase);
gradientDir = gradientDirection.normalized;
var gradientSegment = rect.ProjectionTo(gradientDir);
gradientStart = gradientSegment.x;
gradientDistance = gradientSegment.y - gradientSegment.x;
}
var vCur = new UIVertex();
for (var i = 0; i < vh.currentVertCount; i++)
{
vh.PopulateUIVertex(ref vCur, i);
var retX = vCur.position.x;
var retY = vCur.position.y;
var center = rect.center;
if (Mirror != MirrorType.None)
{
retX = ((int)Mirror % 2 == 1) ? center.x * 2 - vCur.position.x : vCur.position.x;
retY = ((int)Mirror > 1) ? center.y * 2 - vCur.position.y : vCur.position.y;
}
if (m_rotate > 0)
{
var offX = retX - center.x;
var offY = retY - center.y;
switch (m_rotate)
{
case 1:
retX = center.x + offY * rect.width / rect.height;
retY = center.y - offX * rect.height / rect.width;
break;
case 2:
retX = center.x - offX;
retY = center.y - offY;
break;
case 3:
retX = center.x - offY * rect.width / rect.height;
retY = center.y + offX * rect.height / rect.width;
break;
}
}
if (m_skew != Vector2.zero)
{
var offX = retX - rect.xMin;
var offY = retY - rect.yMin;
retX += Mathf.Lerp(-m_skew.x, m_skew.x, offY / rect.height);
retY += Mathf.Lerp(-m_skew.y, m_skew.y, offX / rect.width);
}
if (gradientDir != Vector2.zero && gradientEaseCurve != null)
{
var projectionPos = Vector2.Dot(vCur.position, gradientDir) - gradientStart;
var scaledPos = projectionPos / gradientDistance;
var ratio = gradientEaseCurve.Convert(scaledPos);
vCur.color = Color.Lerp(color, gradientColor, ratio);
}
vCur.position.x = retX;
vCur.position.y = retY;
vh.SetUIVertex(vCur, i);
}
// vh.AddUIVertexTriangleStream(vsNew);
}