public static bool ParticleSelector(Vector3[] positions,
bool[] selectionStatus,
ObiParticleActorEditor.FaceCulling selectBackfaces,
bool[] facingCamera)
{
Matrix4x4 cachedMatrix = Handles.matrix;
int controlID = GUIUtility.GetControlID(particleSelectorHash, FocusType.Passive);
int selectedParticleIndex = -1;
bool selectionStatusChanged = false;
// select vertex on mouse click:
switch (Event.current.GetTypeForControl(controlID))
{
case EventType.MouseDown:
if (Event.current.button != 0)
{
break;
}
startPos = Event.current.mousePosition;
marquee.Set(0, 0, 0, 0);
// If the user is pressing shift, accumulate selection.
if ((Event.current.modifiers & EventModifiers.Shift) == 0 && (Event.current.modifiers & EventModifiers.Alt) == 0)
{
for (int i = 0; i < selectionStatus.Length; i++)
{
selectionStatus[i] = false;
}
}
// If the user is holding down control, dont allow selection of other objects and use marquee tool.
if ((Event.current.modifiers & EventModifiers.Control) != 0)
{
GUIUtility.hotControl = controlID;
}
float minSqrDistance = System.Single.MaxValue;
for (int i = 0; i < positions.Length; i++)
{
// skip not selectable particles:
switch (selectBackfaces)
{
case ObiParticleActorEditor.FaceCulling.Back: if (!facingCamera[i])
{
continue;
}
break;
case ObiParticleActorEditor.FaceCulling.Front: if (facingCamera[i])
{
continue;
}
break;
}
// get particle position in gui space:
Vector2 pos = HandleUtility.WorldToGUIPoint(positions[i]);
// get distance from mouse position to particle position:
float sqrDistance = Vector2.SqrMagnitude(startPos - pos);
// check if this particle is closer to the cursor that any previously considered particle.
if (sqrDistance < 100 && sqrDistance < minSqrDistance) //magic number 100 = 10*10, where 10 is min distance in pixels to select a particle.
{
minSqrDistance = sqrDistance;
selectedParticleIndex = i;
}
}
if (selectedParticleIndex >= 0) // toggle particle selection status.
{
selectionStatus[selectedParticleIndex] = !selectionStatus[selectedParticleIndex];
selectionStatusChanged = true;
// Prevent cloth deselection if we have selected a particle:
GUIUtility.hotControl = controlID;
Event.current.Use();
}
else if (Event.current.modifiers == EventModifiers.None) // deselect all particles:
{
for (int i = 0; i < selectionStatus.Length; i++)
{
selectionStatus[i] = false;
}
selectionStatusChanged = true;
}
break;
case EventType.MouseMove:
SceneView.RepaintAll();
break;
case EventType.MouseDrag:
if (GUIUtility.hotControl == controlID)
{
currentPos = Event.current.mousePosition;
if (!dragging && Vector2.Distance(startPos, currentPos) > 5)
{
dragging = true;
}
else
{
GUIUtility.hotControl = controlID;
Event.current.Use();
}
//update marquee rect:
float left = Mathf.Min(startPos.x, currentPos.x);
float right = Mathf.Max(startPos.x, currentPos.x);
float bottom = Mathf.Min(startPos.y, currentPos.y);
float top = Mathf.Max(startPos.y, currentPos.y);
marquee = new Rect(left, bottom, right - left, top - bottom);
}
break;
case EventType.MouseUp:
if (GUIUtility.hotControl == controlID)
{
dragging = false;
for (int i = 0; i < positions.Length; i++)
{
// skip not selectable particles:
switch (selectBackfaces)
{
case ObiParticleActorEditor.FaceCulling.Back: if (!facingCamera[i])
{
continue;
}
break;
case ObiParticleActorEditor.FaceCulling.Front: if (facingCamera[i])
{
continue;
}
break;
}
// get particle position in gui space:
Vector2 pos = HandleUtility.WorldToGUIPoint(positions[i]);
if (pos.x > marquee.xMin && pos.x < marquee.xMax && pos.y > marquee.yMin && pos.y < marquee.yMax)
{
selectionStatus[i] = true;
selectionStatusChanged = true;
}
}
GUIUtility.hotControl = 0;
Event.current.Use();
}
break;
case EventType.Repaint:
Handles.matrix = Matrix4x4.identity;
if (dragging)
{
GUISkin oldSkin = GUI.skin;
GUI.skin = EditorGUIUtility.GetBuiltinSkin(EditorSkin.Scene);
Handles.BeginGUI();
GUI.Box(new Rect(marquee.xMin, marquee.yMin, marquee.width, marquee.height), "");
Handles.EndGUI();
GUI.skin = oldSkin;
}
Handles.matrix = cachedMatrix;
break;
}
return(selectionStatusChanged);
}
public static bool ParticleBrush(Vector3[] positions,
ObiParticleActorEditor.FaceCulling selectBackfaces,
bool[] facingCamera,
float radius,
Action strokeStart,
Action <List <ParticleStampInfo>, bool> particlesAffected,
Action strokeEnd,
Texture2D brushImage)
{
Matrix4x4 cachedMatrix = Handles.matrix;
int controlID = GUIUtility.GetControlID(particleBrushHash, FocusType.Passive);
bool selectionStatusChanged = false;
List <ParticleStampInfo> affectedParticles = new List <ParticleStampInfo>();
switch (Event.current.GetTypeForControl(controlID))
{
case EventType.MouseDown:
if (Event.current.button != 0 || (Event.current.modifiers & ~EventModifiers.Shift) != EventModifiers.None)
{
break;
}
GUIUtility.hotControl = controlID;
startPos = Event.current.mousePosition;
for (int i = 0; i < positions.Length; i++)
{
// skip not selectable particles:
switch (selectBackfaces)
{
case ObiParticleActorEditor.FaceCulling.Back: if (!facingCamera[i])
{
continue;
}
break;
case ObiParticleActorEditor.FaceCulling.Front: if (facingCamera[i])
{
continue;
}
break;
}
// get particle position in gui space:
Vector2 pos = HandleUtility.WorldToGUIPoint(positions[i]);
// get distance from mouse position to particle position:
float sqrDistance = Vector2.SqrMagnitude(startPos - pos);
if (sqrDistance < radius * radius)
{
affectedParticles.Add(new ParticleStampInfo(i, sqrDistance));
}
}
if (affectedParticles.Count > 0)
{
selectionStatusChanged = true;
if (strokeStart != null)
{
strokeStart();
}
if (particlesAffected != null)
{
particlesAffected(affectedParticles, (Event.current.modifiers & EventModifiers.Shift) != 0);
}
}
Event.current.Use();
break;
case EventType.MouseMove:
SceneView.RepaintAll();
break;
case EventType.MouseDrag:
if (GUIUtility.hotControl == controlID)
{
currentPos = Event.current.mousePosition;
dragging = true;
for (int i = 0; i < positions.Length; i++)
{
// skip not selectable particles:
switch (selectBackfaces)
{
case ObiParticleActorEditor.FaceCulling.Back: if (!facingCamera[i])
{
continue;
}
break;
case ObiParticleActorEditor.FaceCulling.Front: if (facingCamera[i])
{
continue;
}
break;
}
// get particle position in gui space:
Vector2 pos = HandleUtility.WorldToGUIPoint(positions[i]);
// get distance from mouse position to particle position:
float sqrDistance = Vector2.SqrMagnitude(currentPos - pos);
if (sqrDistance < radius * radius)
{
affectedParticles.Add(new ParticleStampInfo(i, sqrDistance));
}
}
if (affectedParticles.Count > 0)
{
selectionStatusChanged = true;
if (particlesAffected != null)
{
particlesAffected(affectedParticles, (Event.current.modifiers & EventModifiers.Shift) != 0);
}
}
Event.current.Use();
}
break;
case EventType.MouseUp:
if (GUIUtility.hotControl == controlID)
{
dragging = false;
GUIUtility.hotControl = 0;
Event.current.Use();
if (strokeEnd != null)
{
strokeEnd();
}
}
break;
case EventType.Repaint:
Handles.matrix = Matrix4x4.identity;
Handles.BeginGUI();
GUI.DrawTexture(new Rect(Event.current.mousePosition.x - radius,
Event.current.mousePosition.y - radius,
radius * 2,
radius * 2), brushImage);
Handles.EndGUI();
Handles.matrix = cachedMatrix;
break;
}
return(selectionStatusChanged);
}