new DiscardMissingTileImagePolicy()
The strategy for discarding tile images that match known 'missing' images.
| Name | Type | Default | Description |
|---|---|---|---|
options.missingImageUrl |
String |
The URL of the missing image is known. |
|
options.pixelsToCheck |
Array.<Cartesian2> |
Cartesian pixel position array for comparison with missing images. |
|
options.disableCheckIfAllPixelsAreTransparent |
Boolean | false |
optional
If it is' true ', then if the alpha value of all pixelsToCheck in missingImageURL is 0, discard check will be disabled. If it is' false ', discard check will be performed regardless of the value of pixelsToCheck. |
Methods
-
isReady(){Boolean}
-
Determine if the discard strategy is ready to process the image.
Returns:
Type Description Boolean If the discard strategy is ready to process the image, it is true; Otherwise, it is false. -
shouldDiscardImage(image){Boolean}
-
Given a tile image, decide whether to discard it.
Name Type Description imageImage Testing images.
Throws:
-
ShouldDiscardImage must not be called before the discard policy is ready.
- Type
- DeveloperError
Returns:
Type Description Boolean If the image should be discarded, it is true; Otherwise, it is false. -