Hi Paul, Thanks for this - this was the perfect solution for my needs.
(I just modified the loading script to add three lines: grab the alphaData, replace numtobyte(0) with numtobyte(1), put it back...).
cheers, Ben On 03/04/2017 04:29, Paul Hibbert via use-livecode wrote:
Ben, if you could edit the PNGs to add a 1% tone to the transparent areas (maybe with a batch process) this allows LC to accept the clicks within the image area. The advantage of this is you could have a 1 % tone inside the area you need be active and completely transparent where you don’t want clicks to be active for example a circular button. The 1% tone should be indistinguishable from the transparent area and will still show the background through. PaulOn Mar 30, 2017, at 10:52 AM, Ben Rubinstein via use-livecode <use-livecode@lists.runrev.com> wrote: I have a group containing a grid of square images. Some of the images are gifs, some are pngs, and some of the latter have an alpha channel with some transparent bits. The images are all used as buttons, to control something else - the images in essence are labels or icons for the buttons. The images have 3d borders to make them look more button-like. The problem is that the if the user happens to click in the transparent area of an image, the target of the mouseup isn't the image but the card. But the image is a button, so I want to catch mouseup anywhere in this square image. I thought that I might be able to use 'the mousecontrol', when the target was the card, to find out which image the mouse was in when; but this too takes account of the transparency of the image. I can see this is a really useful feature - but in this case I want the opposite! Is there a flag somewhere, or another easy way to achieve this? The non-easy ways I'm aware of are: - hide all the images and replace them with buttons referencing the images - re-compositing the images to flatten the alpha channel - iterating through all the images - there are many, in a scrolling group - testing for the mouseloc within the rect of each Is there anything simpler than this, to treat an image as opaque for the purposes of hit-testing? TIA Ben
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