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only update zoom for a valid modifier, fix zoom centering bug when using keyboard shortcuts

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This commit is contained in:
Julian Descottes 2016-07-30 00:01:32 +02:00
parent 3e7999cfc5
commit fdd4fb5b4e
1 changed files with 29 additions and 12 deletions
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29
src/js/controller/DrawingController.js
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@ -253,24 +253,41 @@
evt.preventDefault();
}
this.updateZoom_(modifier);
var coords = this.getSpriteCoordinates(evt.clientX, evt.clientY);
this.updateZoom_(modifier, coords);
};
ns.DrawingController.prototype.updateZoom_ = function (zoomMultiplier) {
var coords = this.getSpriteCoordinates(this._clientX,this._clientY);
/**
* Update the current zoom level by a given multiplier.
*
* @param {Number} zoomMultiplier: factor by which the zoom should be modified. Negative
* values will decrease the zoom, positive values will increase it.
* @param {Object} centerCoords, optional:
* - {Number} x: x coordinate of the desired center the zoomed canvas
* - {Number} y: y coordinate of the desired center the zoomed canvas
*/
ns.DrawingController.prototype.updateZoom_ = function (zoomMultiplier, centerCoords) {
if (zoomMultiplier === 0) {
return;
}
var off = this.getOffset();
var oldWidth = this.getContainerWidth_() / this.renderer.getZoom();
var oldHeight = this.getContainerHeight_() / this.renderer.getZoom();
var xRatio = (coords.x - off.x) / oldWidth;
var yRatio = (coords.y - off.y) / oldHeight;
var step = (zoomMultiplier || 1) * this.getZoomStep_();
var step = zoomMultiplier * this.getZoomStep_();
this.setZoom_(this.renderer.getZoom() + step);
if (centerCoords) {
var xRatio = (centerCoords.x - off.x) / oldWidth;
var yRatio = (centerCoords.y - off.y) / oldHeight;
var newWidth = this.getContainerWidth_() / this.renderer.getZoom();
var newHeight = this.getContainerHeight_() / this.renderer.getZoom();
this.setOffset(
off.x - ((newWidth - oldWidth) * xRatio),
off.y - ((newHeight - oldHeight) * yRatio)
);
}
};
/**