new DiscardMissingTileImagePolicy()
A policy for discarding tile images that match a known image containing a
"missing" image.
| Name | Type | Default | Description |
|---|---|---|---|
options.missingImageUrl |
String | The URL of the known missing image. | |
options.pixelsToCheck |
Cartesian2[] |
An array of Cartesian2 pixel positions to
compare against the missing image. |
|
options.disableCheckIfAllPixelsAreTransparent |
Boolean |
false
|
optional If true, the discard check will be disabled if all of the pixelsToCheck in the missingImageUrl have an alpha value of 0. If false, the discard check will proceed no matter the values of the pixelsToCheck. |
Methods
-
isReady()
-
Determines if the discard policy is ready to process images.
Returns:
True if the discard policy is ready to process images; otherwise, false. -
shouldDiscardImage(image)
-
Given a tile image, decide whether to discard that image.
Name Type Description imageImage An image to test. Returns:
True if the image should be discarded; otherwise, false.Throws:
-
DeveloperError :
shouldDiscardImagemust not be called before the discard policy is ready.
-