# based on CurvedDropShadow.py by Gus Mueller:
# http://flyingmeat.com/blog/archives/2009/01/curved_drop_shadows_in_acorn.html
#
# diddled by Jim DeVona:
# http://anoved.net/

import objc, os, math
from Foundation import *
from AppKit import *

ACScriptSuperMenuTitle = None
ACScriptMenuTitle = "Add Curved Drop Shadow"
ACIsAction = False

def main(image):
    
    doc = NSApplication.sharedApplication().orderedDocuments()[0];
    nsimg  = image.NSImage()
    extent = image.extent()
    
    xOffset = 5
    yOffset = 35
    curveHeight = 15
    imageYOffset = 10
    
    newSize = (extent[1][0], extent[1][1] + imageYOffset)
    newImage = NSImage.alloc().initWithSize_(newSize)
    
    newImage.lockFocus()
    
    # start shadow
    NSGraphicsContext.currentContext().saveGraphicsState()
    shadow = NSShadow.alloc().init()
    shadow.setShadowColor_(NSColor.blackColor().colorWithAlphaComponent_(.6))
    shadow.setShadowOffset_((0, -(yOffset + 5)))
    shadow.setShadowBlurRadius_(5)
    shadow.set()
    
    # make a curved path, at the bottom of our image.
    bezierPath = NSBezierPath.bezierPath()
    
    bezierPath.moveToPoint_((xOffset, 40 + yOffset))
    bezierPath.lineToPoint_((extent[1][0] - (xOffset), 40 + yOffset))
    bezierPath.lineToPoint_((extent[1][0] - (xOffset), 10 + yOffset))
    
    bezierPath.curveToPoint_controlPoint1_controlPoint2_((newSize[0] / 2, curveHeight + yOffset),
                                                         (extent[1][0] - (xOffset), 10 + yOffset),
                                                         (newSize[0] *.75, curveHeight + yOffset))
    
    bezierPath.curveToPoint_controlPoint1_controlPoint2_((xOffset, 10 + yOffset),
                                                         (newSize[0] *.25, curveHeight + yOffset),
                                                         (xOffset, 10 + yOffset))
    
    bezierPath.fill()
    
    # end shadow
    NSGraphicsContext.currentContext().restoreGraphicsState()
    
    # put the original image over the shadow
    nsimg.drawAtPoint_fromRect_operation_fraction_((0, imageYOffset), ((0, 0), (extent[1][0], extent[1][1])), NSCompositeCopy, 1)
    newImage.unlockFocus()
	
	# resize the original canvas and put the shadowed image back on it
    doc.setCanvasSize_usingAnchor_(newSize, "top center")
    return CIImage.imageWithData_(newImage.TIFFRepresentation())