private static void DrawFaceEditor(ref int face, Atlas atlas, ref Matrix4x4 matrix)
{
GUILayout.BeginVertical(GUI.skin.box);
Texture texture = atlas.GetTexture();
Rect rect = GUILayoutUtility.GetAspectRect((float)texture.width / texture.height);
GUILayout.EndVertical();
Matrix4x4 rectMatrix = Matrix4x4.Scale(new Vector3(rect.width, rect.height, 0)) * matrix;
Matrix4x4 invRectMatrix = matrix.inverse * Matrix4x4.Scale(new Vector3(1 / rect.width, 1 / rect.height, 0));
Matrix4x4 invertY = Matrix4x4.TRS(new Vector2(0, 1), Quaternion.identity, new Vector2(1, -1));
bool mouseInRect = rect.Contains(Event.current.mousePosition);
GUI.BeginGroup(rect);
{
Vector2 mouse = invRectMatrix.MultiplyPoint(Event.current.mousePosition); // local mouse [0..1]
if (Event.current.type == EventType.Repaint)
{
Rect texturePosition = Mul(new Rect(0, 0, 1, 1), rectMatrix);
Rect faceRet = atlas.ToRect(face);
faceRet = Mul(faceRet, rectMatrix * invertY);
GUI.DrawTexture(texturePosition, texture);
EditorGUIUtils.DrawRect(faceRet, Color.green);
}
if (Event.current.type == EventType.MouseDown && Event.current.button == 0 && mouseInRect)
{
Vector2 invMouse = invertY.MultiplyPoint(mouse);
if (invMouse.x >= 0 && invMouse.x <= 1 && invMouse.y >= 0 && invMouse.y <= 1)
{
int posX = Mathf.FloorToInt(invMouse.x * atlas.GetWidth());
int posY = Mathf.FloorToInt(invMouse.y * atlas.GetHeight());
face = posY * atlas.GetWidth() + posX;
GUI.changed = true;
Event.current.Use();
}
}
if (Event.current.type == EventType.MouseDrag && Event.current.button == 1 && mouseInRect)
{
Vector3 delta = Event.current.delta;
delta.x /= rect.width;
delta.y /= rect.height;
Matrix4x4 offsetMatrix = Matrix4x4.TRS(delta, Quaternion.identity, Vector3.one);
matrix = offsetMatrix * matrix;
GUI.changed = true;
Event.current.Use();
}
if (Event.current.type == EventType.ScrollWheel && mouseInRect)
{
float s = 0.95f;
if (Event.current.delta.y < 0)
{
s = 1.0f / s;
}
Matrix4x4 offsetMatrix = Matrix4x4.TRS(mouse, Quaternion.identity, Vector3.one);
matrix *= offsetMatrix;
Matrix4x4 scaleMatrix = Matrix4x4.Scale(Vector3.one * s);
matrix *= scaleMatrix;
offsetMatrix = Matrix4x4.TRS(-mouse, Quaternion.identity, Vector3.one);
matrix *= offsetMatrix;
GUI.changed = true;
Event.current.Use();
}
}
GUI.EndGroup();
}