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Make notes scale from the center when using the mouse #663

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Make notes scale from the center when using the mouse #663

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33 changes: 19 additions & 14 deletions client/js/controls/post_notes_overlay_control.js
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Original file line number Diff line number Diff line change
Expand Up @@ -399,6 +399,11 @@ class ScalingNoteState extends ActiveState {
}));
this._originalMousePoint = mousePoint;
this._originalSize = _getNoteSize(note);
this._origin = _getNoteCentroid(this._note);
this._scaleDirection = new Point(
mousePoint.x > this._origin.x ? 1 : -1,
mousePoint.y > this._origin.y ? 1 : -1
);
}

evtCanvasKeyDown(e) {
Expand All @@ -417,22 +422,22 @@ class ScalingNoteState extends ActiveState {
evtCanvasMouseMove(e) {
const mousePoint = this._getPointFromEvent(e);
const originalMousePoint = this._originalMousePoint;
const origin = this._origin;
const originalSize = this._originalSize;
const scaleDirection = this._scaleDirection;
const scale = new Point(
1 +
((mousePoint.x - originalMousePoint.x) / originalSize.x) *
scaleDirection.x,
1 +
((mousePoint.y - originalMousePoint.y) / originalSize.y) *
scaleDirection.y
);
for (let i of misc.range(this._note.polygon.length)) {
const polygonPoint = this._note.polygon.at(i);
const originalPolygonPoint = this._originalPolygon[i];
polygonPoint.x =
originalMousePoint.x +
(originalPolygonPoint.x - originalMousePoint.x) *
(1 +
(mousePoint.x - originalMousePoint.x) /
originalSize.x);
polygonPoint.y =
originalMousePoint.y +
(originalPolygonPoint.y - originalMousePoint.y) *
(1 +
(mousePoint.y - originalMousePoint.y) /
originalSize.y);
const point = this._note.polygon.at(i);
const originalPoint = this._originalPolygon[i];
point.x = origin.x + (originalPoint.x - origin.x) * scale.x;
point.y = origin.y + (originalPoint.y - origin.y) * scale.y;
}
}

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