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The WorldWind Kotlin SDK (WWK) includes the library, examples and tutorials for building multiplatform 3D virtual globe applications for Android, Web and Java.
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package earth.worldwind.render.image
import dev.icerock.moko.resources.ImageResource
import earth.worldwind.util.AbstractSource
import earth.worldwind.util.Logger.ERROR
import earth.worldwind.util.Logger.logMessage
import java.awt.Color
import java.awt.image.BufferedImage
import java.io.File
import java.net.MalformedURLException
import java.net.URL
/**
* Provides a mechanism for specifying images from a variety of sources. ImageSource retains the image source on behalf
* of the caller, making this information available to WorldWind components that load images on the caller's behalf.
*
* ImageSource supports following source types:
* - Uniform Resource Locator [URL]
* - Local image [File]
* - [BufferedImage] object
* - WorldWind [ImageSource.ImageFactory]
* - Multi-platform resource identifier
*
* ImageSource instances are intended to be used as a key into a cache or other data structure that enables sharing of
* loaded images. BufferedImages and WorldWind image factories are compared by reference. File paths and URLs with the
* same string representation considered equals.
*/
actual open class ImageSource protected constructor(source: Any): AbstractSource(source) {
actual companion object {
protected val lineStippleFactories = mutableMapOf()
/**
* Constructs an image source with a multi-platform resource identifier.
*
* @param imageResource the multi-platform resource identifier
*
* @return the new image source
*/
@JvmStatic
actual fun fromResource(imageResource: ImageResource) = ImageSource(imageResource)
/**
* Constructs an image source with a [BufferedImage].
*
* @param image the [BufferedImage] to use as an image source
*
* @return the new image source
*/
@JvmStatic
fun fromImage(image: BufferedImage) = ImageSource(image)
/**
* Constructs an image source with a [ImageFactory]. WorldWind shapes configured with an image factory image source
* construct their images lazily, typically when the shape becomes visible on screen.
*
* @param factory the [ImageFactory] to use as an image source
*
* @return the new image source
*/
@JvmStatic
fun fromImageFactory(factory: ImageFactory) = ImageSource(factory)
/**
* Constructs an image source with a [File].
*
* @param file the source [File] to use as an image source
*
* @return the new image source
*/
@JvmStatic
fun fromFile(file: File): ImageSource {
require(file.isFile) {
logMessage(ERROR, "ImageSource", "fromFile", "invalidFile")
}
return ImageSource(file)
}
/**
* Constructs an image source with a file path.
*
* @param filePath complete path name to the file
*
* @return the new image source
*/
@JvmStatic
fun fromFilePath(filePath: String) = fromFile(File(filePath))
/**
* Constructs an image source with an [URL].
*
* @param url Uniform Resource Locator
*
* @return the new image source
*/
@JvmStatic
fun fromUrl(url: URL) = ImageSource(url)
/**
* Constructs an image source with a URL string.
*
* @param urlString complete URL string
*
* @return the new image source
*/
@JvmStatic
actual fun fromUrlString(urlString: String) = try {
fromUrl(URL(urlString))
} catch (e: MalformedURLException) {
logMessage(ERROR, "ImageSource", "fromUrlString", "invalidUrlString", e)
throw e
}
/**
* Constructs an image source with a line stipple pattern. The result is a one-dimensional image with pixels
* representing the specified stipple factor and stipple pattern. Line stipple images can be used for displaying
* dashed shape outlines. See [earth.worldwind.shape.ShapeAttributes.outlineImageSource].
*
* @param factor specifies the number of times each bit in the pattern is repeated before the next bit is used. For
* example, if the factor is 3, each bit is repeated three times before using the next bit. The
* specified factor must be either 0 or an integer greater than 0. A factor of 0 indicates no
* stippling.
* @param pattern specifies a number whose lower 16 bits define a pattern of which pixels in the image are white and
* which are transparent. Each bit corresponds to a pixel, and the pattern repeats after every n*16
* pixels, where n is the factor. For example, if the factor is 3, each bit in the pattern is
* repeated three times before using the next bit.
*
* @return the new image source
*/
@JvmStatic
actual fun fromLineStipple(factor: Int, pattern: Short): ImageSource {
val lFactor = factor.toLong() and 0xFFFFFFFFL
val lPattern = pattern.toLong() and 0xFFFFL
val key = lFactor shl 32 or lPattern
val factory = lineStippleFactories[key] ?: LineStippleImageFactory(factor, pattern).also {
lineStippleFactories[key] = it
}
return ImageSource(factory)
}
/**
* Constructs an image source with a generic [Any] instance. The source may be any non-null object. This is
* equivalent to calling one of ImageSource's type-specific factory methods when the source is a recognized type.
*
* @param source the generic source
*
* @return the new image source
*/
@JvmStatic
actual fun fromUnrecognized(source: Any) = when (source) {
is ImageResource -> fromResource(source)
is BufferedImage -> fromImage(source)
is ImageFactory -> fromImageFactory(source)
is File -> fromFile(source)
is URL -> fromUrl(source)
else -> ImageSource(source)
}
}
/**
* Indicates whether this image source is a multi-platform resource.
*/
val isResource get() = source is ImageResource
/**
* Indicates whether this image source is a [BufferedImage].
*/
val isImage get() = source is BufferedImage
/**
* Indicates whether this image source is an image factory.
*/
val isImageFactory get() = source is ImageFactory
/**
* Indicates whether this image source is a [File].
*/
val isFile get() = source is File
/**
* Indicates whether this image source is an [URL].
*/
val isUrl get() = source is URL
/**
* @return the source multi-platform resource identifier. Call isResource to determine whether the source is an
* Multi-platform resource.
*/
fun asResource() = source as ImageResource
/**
* @return the source [BufferedImage]. Call [isImage] to determine whether the source is a [BufferedImage].
*/
fun asImage() = source as BufferedImage
/**
* @return the source [ImageFactory]. Call isImageFactory to determine whether the source is an image
* factory.
*/
fun asImageFactory() = source as ImageFactory
/**
* @return the source [File]. Call [isFile] to determine whether the source is a [File].
*/
fun asFile() = source as File
/**
* @return the source [URL]. Call [isUrl] to determine whether the source is an [URL].
*/
fun asUrl() = source as URL
override fun toString() = when (source) {
is ImageResource -> "Resource: $source"
is BufferedImage -> "BufferedImage: $source"
is ImageFactory -> "ImageFactory: $source"
is File -> "File: $source"
is URL -> "URL: $source"
else -> super.toString()
}
/**
* Factory for delegating construction of images. WorldWind shapes configured with a ImageFactory construct
* their images lazily, typically when the shape becomes visible on screen.
*/
interface ImageFactory {
/**
* Image factory runs asynchronously by default, but this behavior can be changed by overriding current attribute.
*/
val isRunBlocking: Boolean get() = false
/**
* Returns the image associated with this factory. This method may be called more than once and may be called
* from a non-UI thread. Each invocation must return an image with equivalent content, dimensions and
* configuration. Any side effects applied to the WorldWind scene by the factory must be executed on the main
* thread.
*
* @return the image associated with this factory
*/
suspend fun createImage(): BufferedImage?
}
protected open class LineStippleImageFactory(protected val factor: Int, protected val pattern: Short): ImageFactory {
override suspend fun createImage(): BufferedImage {
val pixels = if (factor <= 0) {
IntArray(16) { Color.WHITE.rgb }
} else {
IntArray(factor * 16).also { pixels ->
var pixel = 0
for (bi in 0..15) {
val bit = pattern.toInt() and (1 shl bi)
val color = if (bit == 0) 0 else Color.WHITE.rgb
for (fi in 0 until factor) pixels[pixel++] = color
}
}
}
return BufferedImage(pixels.size, 1, BufferedImage.TYPE_INT_ARGB).apply {
setRGB(0, 0, pixels.size, 1, pixels, 0, pixels.size)
}
}
override fun toString() = "LineStippleBitmapFactory factor=$factor, pattern=" + (pattern.toInt() and 0xFFFF).toString(16).uppercase()
}
}