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add comments for thumbHeight

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This commit is contained in:
Matthew Hodgson 2016-04-07 18:10:35 +01:00
parent 7884c13d0d
commit 1125c62505
1 changed files with 15 additions and 0 deletions
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15
src/ImageUtils.js
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@ -17,6 +17,21 @@ limitations under the License.
'use strict';
module.exports = {
/**
* Returns the actual height that an image of dimensions (fullWidth, fullHeight)
* will occupy if resized to fit inside a thumbnail bounding box of size
* (thumbWidth, thumbHeight).
*
* If the aspect ratio of the source image is taller than the aspect ratio of
* the thumbnail bounding box, then we return the thumbHeight parameter unchanged.
* Otherwise we return the thumbHeight parameter scaled down appropriately to
* reflect the actual height the scaled thumbnail occupies.
*
* This is very useful for calculating how much height a thumbnail will actually
* consume in the timeline, when performing scroll offset calcuations
* (e.g. scroll locking)
*/
thumbHeight: function(fullWidth, fullHeight, thumbWidth, thumbHeight) {
if (!fullWidth || !fullHeight) {
// Cannot calculate thumbnail height for image: missing w/h in metadata. We can't even