/**
* A 2D GUI view position handle.
* @param id The Handle id.
* @param position The position in GUI coordinates.
* @param size How large in pixels to draw this handle.
*/
public static Vector2 PositionHandle2d(int id, Vector2 position, int size)
{
int width = size / 4;
var evt = Event.current;
Rect handleRectUp = new Rect(position.x - width / 2, position.y - size - HANDLE_PADDING, width, size + HANDLE_PADDING);
Rect handleRectRight = new Rect(position.x, position.y - width / 2, size, width + HANDLE_PADDING);
Handles.color = Color.yellow;
Handles.CircleHandleCap(-1, position, Quaternion.identity, width / 2f, Event.current.type);
Handles.color = k_HandleColorUp;
// Y Line
Handles.DrawLine(position, position - Vector2.up * size);
// Y Cone
if (position.y - size > 0f)
{
Handles.ConeHandleCap(0, ((Vector3)((position - Vector2.up * size))) - ConeDepth, QuaternionUp, width / 2, evt.type);
}
Handles.color = k_HandleColorRight;
// X Line
Handles.DrawLine(position, position + Vector2.right * size);
// X Cap
if (position.y > 0f)
{
Handles.ConeHandleCap(0, ((Vector3)((position + Vector2.right * size))) - ConeDepth, QuaternionRight, width / 2, evt.type);
}
// If a Tool already is engaged and it's not this one, bail.
if (currentId >= 0 && currentId != id)
{
return(position);
}
Vector2 mousePosition = evt.mousePosition;
Vector2 newPosition = position;
if (currentId == id)
{
switch (evt.type)
{
case EventType.MouseDrag:
newPosition = axisConstraint.Mask(mousePosition + handleOffset) + axisConstraint.InverseMask(position);
break;
case EventType.MouseUp:
case EventType.Ignore:
currentId = -1;
break;
}
}
else
{
if (evt.type == EventType.MouseDown && ((!limitToLeftButton && evt.button != MIDDLE_MOUSE_BUTTON) || evt.button == LEFT_MOUSE_BUTTON))
{
if (Vector2.Distance(mousePosition, position) < width / 2f)
{
currentId = id;
handleOffset = position - mousePosition;
axisConstraint = new HandleConstraint2D(1, 1);
}
else if (handleRectRight.Contains(mousePosition))
{
currentId = id;
handleOffset = position - mousePosition;
axisConstraint = new HandleConstraint2D(1, 0);
}
else if (handleRectUp.Contains(mousePosition))
{
currentId = id;
handleOffset = position - mousePosition;
axisConstraint = new HandleConstraint2D(0, 1);
}
}
}
return(newPosition);
}
/// <summary>
/// Scale handle in 2d space.
/// </summary>
/// <param name="id"></param>
/// <param name="position"></param>
/// <param name="scale"></param>
/// <param name="size"></param>
/// <returns></returns>
public static Vector2 ScaleHandle2d(int id, Vector2 position, Vector2 scale, int size)
{
Event evt = Event.current;
Vector2 mousePosition = evt.mousePosition;
int width = size / 4;
Handles.color = k_HandleColorUp;
Handles.DrawLine(position, position - Vector2.up * size * scale.y);
if (position.y - size > 0f)
{
Handles.CubeHandleCap(0, ((Vector3)((position - Vector2.up * scale.y * size))) - Vector3.forward * 16, QuaternionUp, width / 3, evt.type);
}
Handles.color = k_HandleColorRight;
Handles.DrawLine(position, position + Vector2.right * size * scale.x);
if (position.y > 0f)
{
Handles.CubeHandleCap(0,
((Vector3)((position + Vector2.right * scale.x * size))) - Vector3.forward * 16,
Quaternion.Euler(Vector3.up * 90f),
width / 3f,
evt.type);
}
Handles.color = k_HandleColorScale;
Handles.CubeHandleCap(0,
((Vector3)position) - Vector3.forward * 16,
QuaternionUp,
width / 2f,
evt.type);
// If a Tool already is engaged and it's not this one, bail.
if (currentId >= 0 && currentId != id)
{
return(scale);
}
Rect handleRectUp = new Rect(position.x - width / 2f, position.y - size - HANDLE_PADDING, width, size + HANDLE_PADDING);
Rect handleRectRight = new Rect(position.x, position.y - width / 2f, size + 8, width);
Rect handleRectCenter = new Rect(position.x - width / 2f, position.y - width / 2f, width, width);
if (currentId == id)
{
switch (evt.type)
{
case EventType.MouseDrag:
Vector2 diff = axisConstraint.Mask(mousePosition - initialMousePosition);
diff.x += size;
diff.y = -diff.y; // gui space Y is opposite-world
diff.y += size;
scale = diff / size;
if (axisConstraint == HandleConstraint2D.None)
{
scale.x = Mathf.Min(scale.x, scale.y);
scale.y = Mathf.Min(scale.x, scale.y);
}
break;
case EventType.MouseUp:
case EventType.Ignore:
currentId = -1;
break;
}
}
else
{
if (evt.type == EventType.MouseDown && ((!limitToLeftButton && evt.button != MIDDLE_MOUSE_BUTTON) || evt.button == LEFT_MOUSE_BUTTON))
{
if (handleRectCenter.Contains(mousePosition))
{
currentId = id;
handleOffset = position - mousePosition;
initialMousePosition = mousePosition;
axisConstraint = new HandleConstraint2D(1, 1);
}
else if (handleRectRight.Contains(mousePosition))
{
currentId = id;
handleOffset = position - mousePosition;
initialMousePosition = mousePosition;
axisConstraint = new HandleConstraint2D(1, 0);
}
else if (handleRectUp.Contains(mousePosition))
{
currentId = id;
handleOffset = position - mousePosition;
initialMousePosition = mousePosition;
axisConstraint = new HandleConstraint2D(0, 1);
}
}
}
return(scale);
}
