Flambe - Get Pixel Colour

gistfile1.hx

// Returns the colour of a pixel.

// ImageUtils.hx
import flambe.display.Texture;
import haxe.io.Bytes;
import haxe.io.BytesData;
 
class ImageUtils
{
  public static function getPixelColour( x:Float, y:Float, texture:Texture ):Int {
 
    var bytes:Bytes = texture.readPixels( Math.round( x ), Math.round( y ), 1, 1 );
    var bytesData:BytesData = bytes.getData();
    
    var colourHex:String = bytes.toHex();
    var hexString = decode(colourHex.substring(0, 6)).toHex();
    return Std.parseInt("0x" + decode(colourHex.substring(0, 6)).toHex())
  }
  
  private static function decode( str:String ):Bytes {
    var base = Bytes.ofString("0123456789abcdef");
    // not using `decode` or `decodeString` because the result may contain \0
    // and that is not accepted in strings on all targets
    return new BaseCode(base).decodeBytes(Bytes.ofString(str.toLowerCase()));
  }
}
 
// Example
imageSprite.pointerDown.connect(function(event : PointerEvent){
  var imageSprite:ImageSprite = cast( event.hit, ImageSprite );
  var pixelColour = ImageUtils.getPixelColour(  event.viewX - imageSprite.x._, 
                                                event.viewY - imageSprite.y._, 
                                                imageSprite.texture             );
 
  trace( pixelColour );
});