/**
* @brief update then given LightShadow (create it if the given on is null)
* according to the given Light, ShadingBody and Edge
*/
static public LightShadow UpdateShadow(
LightShadow _toBeUpdate, Light _light,
ShadingBody _body, int _edgeIndex)
{
if (_edgeIndex > _body.GetVerticesNumber())
{
return(null);
}
Vector2 startPoint = _body.GetVertexInWorld(_edgeIndex);
Vector2 endPoint = _body.GetVertexInWorld((_edgeIndex + 1) % _body.GetVerticesNumber());
Vector2 startTill = startPoint +
_light.GetLightDirection(startPoint) * ShadowDistance;
Vector2 endTill = endPoint +
_light.GetLightDirection(endPoint) * ShadowDistance;
// update _toBeUpdate
LightShadow shadow = _toBeUpdate;
if (shadow == null)
{
shadow = new LightShadow();
}
shadow.m_vertexList[0] = startPoint;
shadow.m_vertexList[1] = startTill;
shadow.m_vertexList[2] = endTill;
shadow.m_vertexList[3] = endPoint;
// TODO: not here
shadow.UpdateDrawVertex();
return(shadow);
}
/**
* @brief update lightShadow because the given light has moved
* the algorithm check all the shadowBody then update:
* 1. m_shadingBody2LightDict
* 2. m_light2ShadingBodyDict
* 3. m_lightShadwEdgeDict
* and it also create and remove LightShadow
*/
public void UpdateLight(Light _light)
{
HashSet <int> oldShadowBody;
if (m_light2ShadingBodyDict.ContainsKey(_light.ID))
{
oldShadowBody = m_light2ShadingBodyDict[_light.ID];
}
else
{
oldShadowBody = new HashSet <int>();
}
foreach (KeyValuePair <int, ShadingBody> KeyValuePair in m_shadingBodyDict)
{
if (_light.IsBodyInLightRange(KeyValuePair.Value.GetVertices(), KeyValuePair.Value.GetTransform2World()))
{
int edgeNumber = KeyValuePair.Value.GetVerticesNumber();
for (int e = 0; e < edgeNumber; ++e)
{
int lightShadowBodyEdgeID = GetLightShadowBodyEdgeID(_light.ID, KeyValuePair.Key, e);
// if edge under light
if (_light.ShouldEdgeHasShadow(KeyValuePair.Value, e))
{
if (!m_lightShadowEdgeDict.ContainsKey(lightShadowBodyEdgeID))
{
m_lightShadowEdgeDict.Add(lightShadowBodyEdgeID, LightShadow.UpdateShadow(null,
_light, KeyValuePair.Value, e));
}
else
{
m_lightShadowEdgeDict[lightShadowBodyEdgeID] =
LightShadow.UpdateShadow(m_lightShadowEdgeDict[lightShadowBodyEdgeID],
_light, KeyValuePair.Value, e);
}
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = true;
}
else
{
if (m_lightShadowEdgeDict.ContainsKey(lightShadowBodyEdgeID))
{
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = false;
}
}
}
// update light 2 shadow and shadow 2 light
if (!m_light2ShadingBodyDict.ContainsKey(_light.ID))
{
m_light2ShadingBodyDict[_light.ID] = new HashSet <int>();
}
m_light2ShadingBodyDict[_light.ID].Add(KeyValuePair.Key);
if (!m_shadingBody2LightDict.ContainsKey(KeyValuePair.Key))
{
m_shadingBody2LightDict[KeyValuePair.Key] = new HashSet <int>();
}
m_shadingBody2LightDict[KeyValuePair.Key].Add(_light.ID);
}
//else
else
{
if (oldShadowBody.Contains(KeyValuePair.Key))
{
// remove shadow
int edgeNumber = KeyValuePair.Value.GetVerticesNumber();
for (int e = 0; e < edgeNumber; ++e)
{
int lightShadowBodyEdgeID = GetLightShadowBodyEdgeID(_light.ID, KeyValuePair.Key, e);
if (m_lightShadowEdgeDict.ContainsKey(lightShadowBodyEdgeID))
{
// TODO: not only disable
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = false;
}
}
// update light 2 shadow and shadow 2 light
oldShadowBody.Remove(KeyValuePair.Key);
if (m_light2ShadingBodyDict.ContainsKey(_light.ID))
{
m_light2ShadingBodyDict[_light.ID].Remove(KeyValuePair.Key);
}
}
}
}
}
/**
* @brief update lightShadow because the given shadingbody has moved
* the algorithm check all the lights then update:
* 1. m_shadingBody2LightDict
* 2. m_light2ShadingBodyDict
* 3. m_lightShadwEdgeDict
* and it also create and remove LightShadow
*/
public void UpdateShadowBody(ShadingBody _shadowBody)
{
HashSet <int> oldLight;
if (m_shadingBody2LightDict.ContainsKey(_shadowBody.ID))
{
oldLight = m_shadingBody2LightDict[_shadowBody.ID];
}
else
{
oldLight = new HashSet <int>();
}
foreach (KeyValuePair <int, Light> keyValue in m_lightDict)
{
// if body in light
if (keyValue.Value.IsBodyInLightRange(_shadowBody.GetVertices(), _shadowBody.GetTransform2World()))
{
// update shadow
int edgeNumber = _shadowBody.GetVerticesNumber();
for (int e = 0; e < edgeNumber; ++e)
{
int lightShadowBodyEdgeID = GetLightShadowBodyEdgeID(keyValue.Key, _shadowBody.ID, e);
// if edge under light
if (keyValue.Value.ShouldEdgeHasShadow(_shadowBody, e))
{
m_lightShadowEdgeDict[lightShadowBodyEdgeID] =
LightShadow.UpdateShadow(m_lightShadowEdgeDict[lightShadowBodyEdgeID],
keyValue.Value, _shadowBody, e);
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = true;
}
// else
else
{
// TODO: not only disable, but also remove it
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = false;
}
}
// update light 2 shadow and shadow 2 light
if (!m_light2ShadingBodyDict.ContainsKey(keyValue.Key))
{
m_light2ShadingBodyDict[keyValue.Key] = new HashSet <int>();
}
m_light2ShadingBodyDict[keyValue.Key].Add(_shadowBody.ID);
if (!m_shadingBody2LightDict.ContainsKey(_shadowBody.ID))
{
m_shadingBody2LightDict[_shadowBody.ID] = new HashSet <int>();
}
m_shadingBody2LightDict[_shadowBody.ID].Add(keyValue.Key);
}
// else
else
{
// if light in old-light
if (oldLight.Contains(keyValue.Key))
{
// remove shadow
int edgeNumber = _shadowBody.GetVerticesNumber();
for (int e = 0; e < edgeNumber; ++e)
{
int lightShadowBodyEdgeID = GetLightShadowBodyEdgeID(keyValue.Key, _shadowBody.ID, e);
if (m_lightShadowEdgeDict.ContainsKey(lightShadowBodyEdgeID))
{
// TODO: not only disable
m_lightShadowEdgeDict[lightShadowBodyEdgeID].Enable = false;
}
}
// update light2 2 shadow and shadow 2 light
oldLight.Remove(keyValue.Key);
if (m_light2ShadingBodyDict.ContainsKey(keyValue.Key))
{
m_light2ShadingBodyDict[keyValue.Key].Remove(_shadowBody.ID);
}
}
}
}
}