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add fitBoundsWithConstraints() to the viewport.

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Henri Astre 2014-06-18 11:11:34 -07:00
parent e4800a9455
commit 48aded3824
1 changed files with 123 additions and 2 deletions
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125
src/viewport.js
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@ -471,8 +471,129 @@ $.Viewport.prototype = /** @lends OpenSeadragon.Viewport.prototype */{
return this.zoomTo( newZoom, referencePoint, immediately );
},
/**
* @function
* @param {OpenSeadragon.Rect} bounds
* @param {Boolean} immediately
* @return {OpenSeadragon.Viewport} Chainable.
*/
fitBoundsWithConstraints: function( bounds, immediately ) {
var aspect = this.getAspectRatio(),
center = bounds.getCenter(),
newBounds = new $.Rect(
bounds.x,
bounds.y,
bounds.width,
bounds.height
),
oldBounds,
oldZoom,
newZoom,
referencePoint,
horizontalThreshold,
verticalThreshold,
left,
right,
top,
bottom,
dx = 0,
dy = 0,
newBoundsAspectRatio;
if ( newBounds.getAspectRatio() >= aspect ) {
newBounds.height = bounds.width / aspect;
newBounds.y = center.y - newBounds.height / 2;
} else {
newBounds.width = bounds.height * aspect;
newBounds.x = center.x - newBounds.width / 2;
}
newBoundsAspectRatio = newBounds.getAspectRatio();
this.panTo( this.getCenter( true ), true );
this.zoomTo( this.getZoom( true ), null, true );
oldBounds = this.getBounds();
oldZoom = this.getZoom();
newZoom = 1.0 / newBounds.width;
var newConstrainedZoom = Math.max(
Math.min(newZoom, this.getMaxZoom() ),
this.getMinZoom()
);
if (newZoom !== newConstrainedZoom) {
newZoom = newConstrainedZoom;
newBounds.width = 1.0 / newZoom;
newBounds.x = center.x - newBounds.width / 2;
newBounds.height = newBounds.width / newBoundsAspectRatio;
newBounds.y = center.y - newBounds.height / 2;
}
horizontalThreshold = this.visibilityRatio * newBounds.width;
verticalThreshold = this.visibilityRatio * newBounds.height;
left = newBounds.x + newBounds.width;
right = 1 - newBounds.x;
top = newBounds.y + newBounds.height;
bottom = this.contentAspectY - newBounds.y;
if ( this.wrapHorizontal ) {
//do nothing
} else {
if ( left < horizontalThreshold ) {
dx = horizontalThreshold - left;
}
if ( right < horizontalThreshold ) {
dx = dx ?
( dx + right - horizontalThreshold ) / 2 :
( right - horizontalThreshold );
}
}
if ( this.wrapVertical ) {
//do nothing
} else {
if ( top < verticalThreshold ) {
dy = ( verticalThreshold - top );
}
if ( bottom < verticalThreshold ) {
dy = dy ?
( dy + bottom - verticalThreshold ) / 2 :
( bottom - verticalThreshold );
}
}
if ( dx || dy ) {
newBounds.x += dx;
newBounds.y += dy;
if( newBounds.width > 1 ){
newBounds.x = 0.5 - newBounds.width/2;
}
if( newBounds.height > this.contentAspectY ){
newBounds.y = this.contentAspectY/2 - newBounds.height/2;
}
}
if ( newZoom == oldZoom || newBounds.width == oldBounds.width ) {
return this.panTo( newBounds.getCenter(), immediately );
}
referencePoint = oldBounds.getTopLeft().times(
this.containerSize.x / oldBounds.width
).minus(
newBounds.getTopLeft().times(
this.containerSize.x / newBounds.width
)
).divide(
this.containerSize.x / oldBounds.width -
this.containerSize.x / newBounds.width
);
return this.zoomTo( newZoom, referencePoint, immediately );
},
/**
* @function
* @param {Boolean} immediately