/// <summary>
/// Pack rects inside of a square. Rects should be ordered descending from their volume.
/// </summary>
public static RectPack PackOrderedRects(List <Rect> rects)
{
// Find the best packing.
Rect drawingArea = new Rect(0, 0, 1, 1);
float resizeStep = Mathf.Min(rects[rects.Count - 1].width, rects[rects.Count - 1].height);
RectPack finalResult = null;
RectPack previousResult = null;
while (finalResult == null)
{
RectPack tempResult = TryPackingRects(rects, drawingArea);
if (tempResult.rects.Count == rects.Count)
{
// Success : retry a pack with a smaller area.
previousResult = tempResult;
drawingArea = new Rect(drawingArea.position, drawingArea.size - Vector2.one * resizeStep);
}
else
{
// Failure: keep the previous result if it was a success, else retry with a bigger area.
if (previousResult != null && previousResult.rects.Count == rects.Count)
{
finalResult = previousResult;
}
else
{
drawingArea = new Rect(drawingArea.position, drawingArea.size + Vector2.one * resizeStep);
}
}
}
// Trim the edges of the packing area.
float maxWidth = 0;
float maxHeight = 0;
foreach (Rect rect in finalResult.rects)
{
if (rect.position.x + rect.width > maxWidth)
{
maxWidth = rect.position.x + rect.width;
}
if (rect.position.y + rect.width > maxHeight)
{
maxHeight = rect.position.y + rect.height;
}
}
finalResult.area.size = Vector2.one * Mathf.Max(maxWidth, maxHeight);
return(finalResult);
}
void OnGUI()
{
// Get rects from test ratios.
List <Rect> ratiosRects = new List <Rect>();
foreach (float ratio in ratios)
{
ratiosRects.Add(RatioToRect(ratio));
}
// Pack rects.
if (rects.Count < 1)
{
RectPack packingResult = RectPacker.PackOrderedRects(ratiosRects);
float areaRatio = 1 / packingResult.area.width;
foreach (Rect packedRect in packingResult.rects)
{
rects.Add(new Rect(packedRect.position * areaRatio, packedRect.size * areaRatio));
}
}
// Draw title and area.
GUILayout.Label("UVs", EditorStyles.boldLabel);
Rect uVDisplayRect = EditorGUILayout.GetControlRect(GUILayout.Width(300), GUILayout.Height(300));
EditorGUI.DrawRect(new Rect(uVDisplayRect.position, uVDisplayRect.size), Color.grey);
// Draw rects.
Vector2 startPosition = new Vector2(uVDisplayRect.x, uVDisplayRect.y + uVDisplayRect.height);
float displayArea = uVDisplayRect.width * uVDisplayRect.height;
for (int i = 0; i < rects.Count; i++)
{
GUI.Label(new Rect(rects[i].position * uVDisplayRect.width + uVDisplayRect.position, rects[i].size * uVDisplayRect.width), i.ToString(), GUI.skin.textArea);
}
if (GUILayout.Button("Reset"))
{
rects.Clear();
}
// Ratios property.
SerializedObject so = new SerializedObject(this);
SerializedProperty ratiosProperty = so.FindProperty("ratios");
EditorGUILayout.PropertyField(ratiosProperty);
so.ApplyModifiedProperties();
}
