using System;
using System.Reflection;
using UnityEngine;
namespace UnityEditor.Rendering.Universal
{
// Copy of UnityEditor.Rendering.HighDefinition.DisplacableRectHandles
class DisplacableRectHandles
{
const float k_HandleSizeCoef = 0.05f;
enum NamedEdge { Right, Top, Left, Bottom, None }
int[] m_ControlIDs = new int[4] { 0, 0, 0, 0 };
Color m_MonochromeHandleColor;
Color m_WireframeColor;
Color m_WireframeColorBehind;
/// <summary>The position of the center of the box in Handle.matrix space. On plane z=0.</summary>
public Vector2 center { get; set; }
/// <summary>The size of the box in Handle.matrix space. On plane z=0.</summary>
public Vector2 size { get; set; }
//Note: Handles.Slider not allow to use a specific ControlID.
//Thus Slider1D is used (with reflection)
static Type k_Slider1D = Type.GetType("UnityEditorInternal.Slider1D, UnityEditor");
static MethodInfo k_Slider1D_Do = k_Slider1D
.GetMethod(
"Do",
BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public,
null,
CallingConventions.Any,
new[] { typeof(int), typeof(Vector3), typeof(Vector3), typeof(float), typeof(Handles.CapFunction), typeof(float) },
null);
static void Slider1D(int controlID, ref Vector3 handlePosition, Vector3 handleOrientation, float snapScale)
{
handlePosition = (Vector3)k_Slider1D_Do.Invoke(null, new object[]
{
controlID,
handlePosition,
handleOrientation,
HandleUtility.GetHandleSize(handlePosition) * k_HandleSizeCoef,
new Handles.CapFunction(Handles.DotHandleCap),
snapScale
});
}
/// <summary>The baseColor used to draw the rect.</summary>
public Color baseColor
{
get { return m_MonochromeHandleColor; }
set
{
m_MonochromeHandleColor = GizmoUtility.GetHandleColor(value);
m_WireframeColor = GizmoUtility.GetWireframeColor(value);
m_WireframeColorBehind = GizmoUtility.GetWireframeColorBehindObjects(value);
}
}
public DisplacableRectHandles(Color baseColor)
{
this.baseColor = baseColor;
}
/// <summary>Draw the rect.</summary>
public void DrawRect(bool dottedLine = false, float thickness = .0f, float screenSpaceSize = 5f)
{
Vector2 start = center - size * .5f;
Vector3[] positions = new Vector3[]
{
start,
start + size * Vector2.right,
start + size,
start + size * Vector2.up
};
Vector3[] edges = new Vector3[]
{
positions[0], positions[1],
positions[1], positions[2],
positions[2], positions[3],
positions[3], positions[0],
};
void Draw()
{
if (dottedLine)
Handles.DrawDottedLines(edges, screenSpaceSize);
else
{
Handles.DrawLine(positions[0], positions[1], thickness);
Handles.DrawLine(positions[1], positions[2], thickness);
Handles.DrawLine(positions[2], positions[3], thickness);
Handles.DrawLine(positions[3], positions[0], thickness);
}
}
Color previousColor = Handles.color;
Handles.color = m_WireframeColor;
Handles.zTest = UnityEngine.Rendering.CompareFunction.LessEqual;
Draw();
Handles.color = m_WireframeColorBehind;
Handles.zTest = UnityEngine.Rendering.CompareFunction.Greater;
Draw();
Handles.zTest = UnityEngine.Rendering.CompareFunction.Always;
Handles.color = previousColor;
}
NamedEdge DrawSliders(ref Vector3 leftPosition, ref Vector3 rightPosition, ref Vector3 topPosition, ref Vector3 bottomPosition)
{
NamedEdge theChangedEdge = NamedEdge.None;
using (new Handles.DrawingScope(m_MonochromeHandleColor))
{
EditorGUI.BeginChangeCheck();
Slider1D(m_ControlIDs[(int)NamedEdge.Left], ref leftPosition, Vector3.left, EditorSnapSettings.scale);
if (EditorGUI.EndChangeCheck())
theChangedEdge = NamedEdge.Left;
EditorGUI.BeginChangeCheck();
Slider1D(m_ControlIDs[(int)NamedEdge.Right], ref rightPosition, Vector3.right, EditorSnapSettings.scale);
if (EditorGUI.EndChangeCheck())
theChangedEdge = NamedEdge.Right;
EditorGUI.BeginChangeCheck();
Slider1D(m_ControlIDs[(int)NamedEdge.Top], ref topPosition, Vector3.up, EditorSnapSettings.scale);
if (EditorGUI.EndChangeCheck())
theChangedEdge = NamedEdge.Top;
EditorGUI.BeginChangeCheck();
Slider1D(m_ControlIDs[(int)NamedEdge.Bottom], ref bottomPosition, Vector3.down, EditorSnapSettings.scale);
if (EditorGUI.EndChangeCheck())
theChangedEdge = NamedEdge.Bottom;
}
return theChangedEdge;
}
void EnsureEdgeFacesOutsideForHomothety(NamedEdge theChangedEdge, ref Vector3 leftPosition, ref Vector3 rightPosition, ref Vector3 topPosition, ref Vector3 bottomPosition)
{
switch (theChangedEdge)
{
case NamedEdge.Left:
if (rightPosition.x < leftPosition.x)
leftPosition.x = rightPosition.x;
if (topPosition.y < bottomPosition.y)
topPosition.y = bottomPosition.y = center.y;
break;
case NamedEdge.Right:
if (rightPosition.x < leftPosition.x)
rightPosition.x = leftPosition.x;
if (topPosition.y < bottomPosition.y)
topPosition.y = bottomPosition.y = center.y;
break;
case NamedEdge.Top:
if (topPosition.y < bottomPosition.y)
topPosition.y = bottomPosition.y;
if (rightPosition.x < leftPosition.x)
rightPosition.x = leftPosition.x = center.x;
break;
case NamedEdge.Bottom:
if (topPosition.y < bottomPosition.y)
bottomPosition.y = topPosition.y;
if (rightPosition.x < leftPosition.x)
rightPosition.x = leftPosition.x = center.x;
break;
}
}
void EnsureEdgeFacesOutsideForSymetry(NamedEdge theChangedEdge, ref Vector3 leftPosition, ref Vector3 rightPosition, ref Vector3 topPosition, ref Vector3 bottomPosition)
{
switch (theChangedEdge)
{
case NamedEdge.Left:
case NamedEdge.Right:
if (rightPosition.x < leftPosition.x)
rightPosition.x = leftPosition.x = center.x;
break;
case NamedEdge.Top:
case NamedEdge.Bottom:
if (topPosition.y < bottomPosition.y)
topPosition.y = bottomPosition.y = center.y;
break;
}
}
void EnsureEdgeFacesOutsideForOtherTransformation(ref Vector2 max, ref Vector2 min)
{
for (int axis = 0; axis < 2; ++axis)
{
if (min[axis] > max[axis])
{
// Control IDs in m_ControlIDs[0-1] are for positive axes
if (GUIUtility.hotControl == m_ControlIDs[axis])
max[axis] = min[axis];
else
min[axis] = max[axis];
}
}
}
/// <summary>Draw the manipulable handles</summary>
public void DrawHandle()
{
Event evt = Event.current;
bool useHomothety = evt.shift;
bool useSymetry = evt.alt || evt.command;
// Note: snapping is handled natively on ctrl for each Slider1D
for (int i = 0, count = m_ControlIDs.Length; i < count; ++i)
m_ControlIDs[i] = GUIUtility.GetControlID("DisplacableRectHandles".GetHashCode() + i, FocusType.Passive);
Vector3 leftPosition = center + size.x * .5f * Vector2.left;
Vector3 rightPosition = center + size.x * .5f * Vector2.right;
Vector3 topPosition = center + size.y * .5f * Vector2.up;
Vector3 bottomPosition = center + size.y * .5f * Vector2.down;
var theChangedEdge = NamedEdge.None;
EditorGUI.BeginChangeCheck();
theChangedEdge = DrawSliders(ref leftPosition, ref rightPosition, ref topPosition, ref bottomPosition);
if (EditorGUI.EndChangeCheck())
{
float delta = 0f;
switch (theChangedEdge)
{
case NamedEdge.Left: delta = ((Vector2)leftPosition - center - size.x * .5f * Vector2.left).x; break;
case NamedEdge.Right: delta = -((Vector2)rightPosition - center - size.x * .5f * Vector2.right).x; break;
case NamedEdge.Top: delta = -((Vector2)topPosition - center - size.y * .5f * Vector2.up).y; break;
case NamedEdge.Bottom: delta = ((Vector2)bottomPosition - center - size.y * .5f * Vector2.down).y; break;
}
if (useHomothety && useSymetry)
{
var tempSize = size - Vector2.one * delta;
//ensure that the rect edges are still facing outside
for (int axis = 0; axis < 3; ++axis)
{
if (tempSize[axis] < 0)
{
delta += tempSize[axis];
tempSize = size - Vector2.one * delta;
}
}
size = tempSize;
}
else
{
if (useSymetry)
{
switch (theChangedEdge)
{
case NamedEdge.Left: rightPosition.x -= delta; break;
case NamedEdge.Right: leftPosition.x += delta; break;
case NamedEdge.Top: bottomPosition.y += delta; break;
case NamedEdge.Bottom: topPosition.y -= delta; break;
}
EnsureEdgeFacesOutsideForSymetry(theChangedEdge, ref leftPosition, ref rightPosition, ref topPosition, ref bottomPosition);
}
if (useHomothety)
{
float halfDelta = delta * 0.5f;
switch (theChangedEdge)
{
case NamedEdge.Left:
case NamedEdge.Right:
bottomPosition.y += halfDelta;
topPosition.y -= halfDelta;
break;
case NamedEdge.Top:
case NamedEdge.Bottom:
rightPosition.x -= halfDelta;
leftPosition.x += halfDelta;
break;
}
EnsureEdgeFacesOutsideForHomothety(theChangedEdge, ref leftPosition, ref rightPosition, ref topPosition, ref bottomPosition);
}
var max = new Vector2(rightPosition.x, topPosition.y);
var min = new Vector2(leftPosition.x, bottomPosition.y);
if (!useSymetry && !useHomothety)
EnsureEdgeFacesOutsideForOtherTransformation(ref max, ref min);
center = (max + min) * .5f;
size = max - min;
}
}
}
}
}