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Add coordinates conversion methods to TiledImage.

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This commit is contained in:
Antoine Vandecreme 2015-06-02 16:41:37 -04:00
parent 300cf6e777
commit aa021d87c0
2 changed files with 128 additions and 20 deletions
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77
src/tiledimage.js
View File

@ -406,6 +406,83 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
); );
}, },
/**
* Convert pixel coordinates relative to the viewer element to image
* coordinates.
* @param {OpenSeadragon.Point} pixel
* @returns {OpenSeadragon.Point}
*/
viewerElementToImageCoordinates: function( pixel ) {
var point = this.viewport.pointFromPixel( pixel, true );
return this.viewportToImageCoordinates( point );
},
/**
* Convert pixel coordinates relative to the image to
* viewer element coordinates.
* @param {OpenSeadragon.Point} pixel
* @returns {OpenSeadragon.Point}
*/
imageToViewerElementCoordinates: function( pixel ) {
var point = this.imageToViewportCoordinates( pixel );
return this.viewport.pixelFromPoint( point, true );
},
/**
* Convert pixel coordinates relative to the window to image coordinates.
* @param {OpenSeadragon.Point} pixel
* @returns {OpenSeadragon.Point}
*/
windowToImageCoordinates: function( pixel ) {
var viewerCoordinates = pixel.minus(
OpenSeadragon.getElementPosition( this.viewer.element ));
return this.viewerElementToImageCoordinates( viewerCoordinates );
},
/**
* Convert image coordinates to pixel coordinates relative to the window.
* @param {OpenSeadragon.Point} pixel
* @returns {OpenSeadragon.Point}
*/
imageToWindowCoordinates: function( pixel ) {
var viewerCoordinates = this.imageToViewerElementCoordinates( pixel );
return viewerCoordinates.plus(
OpenSeadragon.getElementPosition( this.viewer.element ));
},
/**
* Convert a viewport zoom to an image zoom.
* Image zoom: ratio of the original image size to displayed image size.
* 1 means original image size, 0.5 half size...
* Viewport zoom: ratio of the displayed image's width to viewport's width.
* 1 means identical width, 2 means image's width is twice the viewport's width...
* @function
* @param {Number} viewportZoom The viewport zoom
* @returns {Number} imageZoom The image zoom
*/
viewportToImageZoom: function( viewportZoom ) {
var ratio = this._scaleSpring.current.value *
this.viewport._containerInnerSize.x / this.source.dimensions.x;
return ratio * viewportZoom ;
},
/**
* Convert an image zoom to a viewport zoom.
* Image zoom: ratio of the original image size to displayed image size.
* 1 means original image size, 0.5 half size...
* Viewport zoom: ratio of the displayed image's width to viewport's width.
* 1 means identical width, 2 means image's width is twice the viewport's width...
* Note: not accurate with multi-image.
* @function
* @param {Number} imageZoom The image zoom
* @returns {Number} viewportZoom The viewport zoom
*/
imageToViewportZoom: function( imageZoom ) {
var ratio = this._scaleSpring.current.value *
this.viewport._containerInnerSize.x / this.source.dimensions.x;
return imageZoom / ratio;
},
/** /**
* Sets the TiledImage's position in the world. * Sets the TiledImage's position in the world.
* @param {OpenSeadragon.Point} position - The new position, in viewport coordinates. * @param {OpenSeadragon.Point} position - The new position, in viewport coordinates.

71
test/demo/coordinates.html
View File

@ -1,21 +1,21 @@
<!DOCTYPE html> <!DOCTYPE html>
<html> <html>
<head> <head>
<title>OpenSeadragon Basic Demo</title> <title>OpenSeadragon Coordinates Demo</title>
<script type="text/javascript" src='../../build/openseadragon/openseadragon.js'></script> <script type="text/javascript" src='../../build/openseadragon/openseadragon.js'></script>
<script type="text/javascript" src='../lib/jquery-1.9.1.min.js'></script> <script type="text/javascript" src='../lib/jquery-1.9.1.min.js'></script>
<style type="text/css"> <style type="text/css">
.openseadragon1 { .openseadragon1 {
width: 800px; width: 800px;
height: 600px; height: 600px;
} }
</style> </style>
</head> </head>
<body> <body>
<div> <div>
Simple demo page to show a default OpenSeadragon viewer. Simple demo page to show OpenSeadragon coordinates system.
</div> </div>
<div id="contentDiv" class="openseadragon1"></div> <div id="contentDiv" class="openseadragon1"></div>
<div> <div>
@ -24,16 +24,26 @@
<th></th> <th></th>
<th>Window (pixel)</th> <th>Window (pixel)</th>
<th>Container (pixel)</th> <th>Container (pixel)</th>
<th>Image (pixel)</th> <th>Image 1 - top left (pixel)</th>
<th>Image 2 - bottom right (pixel)</th>
<th>Viewport (point)</th> <th>Viewport (point)</th>
</tr> </tr>
<tr> <tr>
<th>Cursor position</th> <th>Cursor position</th>
<td id="windowPosition"></td> <td id="windowPosition"></td>
<td id="containerPosition"></td> <td id="containerPosition"></td>
<td id="imagePosition"></td> <td id="image1Position"></td>
<td id="image2Position"></td>
<td id="viewportPosition"></td> <td id="viewportPosition"></td>
</tr>
<tr> <tr>
<th>Zoom</th>
<td>-</td>
<td>-</td>
<td id="image1Zoom"></td>
<td id="image2Zoom"></td>
<td id="viewportZoom"></td>
</tr>
</table> </table>
</div> </div>
<script type="text/javascript"> <script type="text/javascript">
@ -42,36 +52,57 @@
// debugMode: true, // debugMode: true,
id: "contentDiv", id: "contentDiv",
prefixUrl: "../../build/openseadragon/images/", prefixUrl: "../../build/openseadragon/images/",
tileSources: "../data/testpattern.dzi", tileSources: [{
showNavigator:true tileSource: "../data/testpattern.dzi"
},
{
tileSource: "../data/testpattern.dzi",
x: 1,
y: 1,
width: 0.5
}
],
showNavigator: true
}); });
function pointToString(point) { function pointToString(point) {
return point.x.toPrecision(4) + "," + point.y.toPrecision(4); return point.x.toPrecision(4) + "," + point.y.toPrecision(4);
} }
var onMouseTrackerMove = function(event) { var onMouseTrackerMove = function (event) {
var viewerX = event.position.x; var viewerX = event.position.x;
var viewerY = event.position.y; var viewerY = event.position.y;
var windowPoint = new OpenSeadragon.Point(viewerX, viewerY); var windowPoint = new OpenSeadragon.Point(viewerX, viewerY);
$("#windowPosition").text( pointToString(windowPoint)); $("#windowPosition").text(pointToString(windowPoint));
var containerPoint = windowPoint.minus( var containerPoint = windowPoint.minus(
OpenSeadragon.getElementPosition(viewer.element)); OpenSeadragon.getElementPosition(viewer.element));
$("#containerPosition").text( pointToString(containerPoint)); $("#containerPosition").text(pointToString(containerPoint));
var image1 = viewer.world.getItemAt(0);
var imagePoint = viewer.viewport.windowToImageCoordinates(windowPoint); var imagePoint = image1.windowToImageCoordinates(windowPoint);
$("#imagePosition").text( pointToString(imagePoint)); $("#image1Position").text(pointToString(imagePoint));
var image2 = viewer.world.getItemAt(1);
var imagePoint = image2.windowToImageCoordinates(windowPoint);
$("#image2Position").text(pointToString(imagePoint));
var viewportPoint = viewer.viewport.windowToViewportCoordinates(windowPoint); var viewportPoint = viewer.viewport.windowToViewportCoordinates(windowPoint);
$("#viewportPosition").text( pointToString(viewportPoint)); $("#viewportPosition").text(pointToString(viewportPoint));
}; };
mouseTracker = new OpenSeadragon.MouseTracker({ mouseTracker = new OpenSeadragon.MouseTracker({
element: document, element: document,
moveHandler: onMouseTrackerMove moveHandler: onMouseTrackerMove
}).setTracking(true); }).setTracking(true);
function onAnimation() {
var viewportZoom = viewer.viewport.getZoom(true);
$("#viewportZoom").text(viewportZoom.toFixed(3));
var image1 = viewer.world.getItemAt(0);
var image1Zoom = image1.viewportToImageZoom(viewportZoom);
$("#image1Zoom").text(image1Zoom.toFixed(3));
var image2 = viewer.world.getItemAt(1);
var image2Zoom = image2.viewportToImageZoom(viewportZoom);
$("#image2Zoom").text(image2Zoom.toFixed(3));
}
viewer.addHandler("animation", onAnimation);
</script> </script>
</body> </body>
</html> </html>