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client/notes: make keyboard scaling use centroids

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Previously it used first polygon point.
This commit is contained in:
rr- 2016-08-05 22:07:29 +02:00
parent 9013f15c1a
commit b7149ba7d6
1 changed files with 30 additions and 18 deletions
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48
client/js/controls/post_notes_overlay_control.js
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@ -39,6 +39,26 @@ function _clearEditedNote(hostNode) {
return node !== null;
}
function _getNoteCentroid(note) {
const vertexCount = note.polygon.length;
const centroid = new Point(0, 0);
let signedArea = 0.0;
for (let i of misc.range(vertexCount)) {
const x0 = note.polygon.at(i).x;
const y0 = note.polygon.at(i).y;
const x1 = note.polygon.at((i + 1) % vertexCount).x;
const y1 = note.polygon.at((i + 1) % vertexCount).y;
const a = x0 * y1 - x1 * y0;
signedArea += a;
centroid.x += (x0 + x1) * a;
centroid.y += (y0 + y1) * a;
}
signedArea *= 0.5;
centroid.x /= 6 * signedArea;
centroid.y /= 6 * signedArea;
return centroid;
}
function _getNoteSize(note) {
const min = new Point(Infinity, Infinity);
const max = new Point(-Infinity, -Infinity);
@ -261,25 +281,17 @@ class SelectedState extends ActiveState {
}
_scaleEditedNote(x, y) {
const min = new Point(Infinity, Infinity);
const max = new Point(-Infinity, -Infinity);
const origin = _getNoteCentroid(this._note);
const originalSize = _getNoteSize(this._note);
const targetSize = new Point(
originalSize.x + x / this._control.boundingBox.width,
originalSize.y + y / this._control.boundingBox.height);
const scale = new Point(
targetSize.x / originalSize.x,
targetSize.y / originalSize.y);
for (let point of this._note.polygon) {
min.x = Math.min(min.x, point.x);
min.y = Math.min(min.y, point.y);
max.x = Math.max(max.x, point.x);
max.y = Math.max(max.y, point.y);
}
const originalWidth = max.x - min.x;
const originalHeight = max.y - min.y;
const targetWidth = originalWidth +
x / this._control.boundingBox.width;
const targetHeight = originalHeight +
y / this._control.boundingBox.height;
const scaleX = targetWidth / originalWidth;
const scaleY = targetHeight / originalHeight;
for (let point of this._note.polygon) {
point.x = min.x + ((point.x - min.x) * scaleX);
point.y = min.y + ((point.y - min.y) * scaleY);
point.x = origin.x + ((point.x - origin.x) * scale.x);
point.y = origin.y + ((point.y - origin.y) * scale.y);
}
}
}