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Vertex Effect Example
using System.Collections.Generic;
namespace UnityEngine.UI
{
[AddComponentMenu ("UI/Effects/Shadow", 14)]
public class Shadow : BaseVertexEffect
{
[SerializeField]
private Color m_EffectColor = new Color (0f, 0f, 0f, 0.5f);
[SerializeField]
private Vector2 m_EffectDistance = new Vector2 (1f, -1f);
[SerializeField]
private bool m_UseGraphicAlpha = true;
protected Shadow()
{}
#if UNITY_EDITOR
protected override void OnValidate()
{
effectDistance = m_EffectDistance;
base.OnValidate ();
}
#endif
public Color effectColor
{
get { return m_EffectColor; }
set
{
m_EffectColor = value;
if (graphic != null)
graphic.SetVerticesDirty ();
}
}
public Vector2 effectDistance
{
get { return m_EffectDistance; }
set
{
if (value.x > 600)
value.x = 600;
if (value.x < -600)
value.x = -600;
if (value.y > 600)
value.y = 600;
if (value.y < -600)
value.y = -600;
if (m_EffectDistance == value)
return;
m_EffectDistance = value;
if (graphic != null)
graphic.SetVerticesDirty ();
}
}
public bool useGraphicAlpha
{
get { return m_UseGraphicAlpha; }
set
{
m_UseGraphicAlpha = value;
if (graphic != null)
graphic.SetVerticesDirty ();
}
}
protected void ApplyShadow(List<UIVertex> verts, Color32 color, int start, int end, float x, float y)
{
UIVertex vt;
var neededCpacity = verts.Count * 2;
if (verts.Capacity < neededCpacity)
verts.Capacity = neededCpacity;
for (int i = start; i < end; ++i)
{
vt = verts[i];
verts.Add (vt);
Vector3 v = vt.position;
v.x += x;
v.y += y;
vt.position = v;
var newColor = color;
if (m_UseGraphicAlpha)
newColor.a = (byte)((newColor.a * verts[i].color.a) / 255);
vt.color = newColor;
verts[i] = vt;
}
}
public override void ModifyVertices(List<UIVertex> verts)
{
if (!IsActive ())
return;
ApplyShadow (verts, effectColor, 0, verts.Count, effectDistance.x, effectDistance.y);
}
}
}
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