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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* The Zoom tool allows the user to Zoom around the view by clicking and
* dragging.
*/
function ZoomTool(camera) {
this.camera = camera;
this.dragging = false;
this.lastOffsetY = null;
}
ZoomTool.prototype.handleMouseDown = function(e) {
this.lastOffsetY = e.y;
this.dragging = true;
};
ZoomTool.prototype.handleMouseMove = function(e) {
if (this.dragging && e.x !== undefined) {
dY = (e.y - this.lastOffsetY);
this.lastOffsetY = e.y;
var zoomLevels = Math.abs(dY / 6);
var zoomChange;
if (dY < 0) {
zoomChange = Math.pow(11 / 12, zoomLevels);
} else {
zoomChange = Math.pow((1 + 1 / 12), zoomLevels);
}
this.camera.eye.distanceFromTarget *= zoomChange;
this.camera.update();
}
};
ZoomTool.prototype.handleMouseUp = function(e) {
this.dragging = false;
};
ZoomTool.prototype.handleKeyDown = function(e) {
return false;
};
ZoomTool.prototype.handleKeyUp = function(e) {
return false;
};
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