Author Topic: Features Wishlist (Read 691420 times)

epic7 · « **Reply #2850 on:** December 17, 2011, 08:08:29 pm »

Quote from: Freyaday on December 17, 2011, 08:05:59 pm

A sprite command that would treat black as transparent and white as solid. Perhaps it could be called Pt-Black()?

Wat? You mean draw the sprite inverted?

Builderboy · « **Reply #2851 on:** December 17, 2011, 08:15:31 pm »

Couldn't you just use Pt-Mask() ?

LincolnB · « **Reply #2852 on:** December 17, 2011, 08:15:47 pm »

well that's relatively easy to write a subroutine yourself, just Logically XOR every byte of the sprite with 255.

Builderboy · « **Reply #2853 on:** December 17, 2011, 08:17:23 pm »

Quote from: buttsfredkin on December 17, 2011, 08:15:47 pm

well that's relatively easy to write a subroutine yourself, just Logically OR every byte of the sprite with 255.

Wouldn't that return 255 all the time? O.o What he wants is AND sprite logic.

Freyaday · « **Reply #2854 on:** December 17, 2011, 08:44:00 pm »

No, NOR logic.

Builderboy · « **Reply #2855 on:** December 17, 2011, 09:16:47 pm »

Mmm I believe AND logic is what you want, here is the truth table:

Sprite:	Screen:	Result:
0	0	0
0	1	0
1	0	0
1	1	1

As you can see, when the sprite is white (0) it forces the result to be white. This emulates a solid white color. When the sprite is black, the result is equal to the screen, which emulates a transparent color. NOR logic would look like so:

Sprite:	Screen:	Result:
0	0	1
0	1	0
1	0	0
1	1	0

Where if the sprite was black, the result would be white, and if the sprite was white, the result would be an inverse.

LincolnB · « **Reply #2856 on:** December 17, 2011, 09:25:07 pm »

Oops, I meant XOR. My bad, I modified the last post. XOR the sprite with 255 and do a Pt-On with that sprite. Although if you're logically altering L6 directly, AND logic should be good.

Builderboy · « **Reply #2857 on:** December 17, 2011, 09:29:29 pm »

That won't work either because Pt-On can only turn on pixels, not turn them off.

Quigibo · « **Reply #2858 on:** December 17, 2011, 09:32:07 pm »

Yeah, the best option is to work with the "Light" version of the screen and use the standard Pt-Mask()^r, but right before the DispGraph, do a DrawInv. If you don't clear the screen after that and need to continue working with it, just call another DrawInv to convert it back again to the light version.

LincolnB · « **Reply #2859 on:** December 17, 2011, 09:35:07 pm »

Oh, I was under the impression Freyaday wanted white pixels in the sprite to show up black on the screen, and black pixels to not show up. Guess not.

Builderboy · « **Reply #2860 on:** December 17, 2011, 09:43:31 pm »

Quote from: Quigibo on December 17, 2011, 09:32:07 pm

Yeah, the best option is to work with the "Light" version of the screen and use the standard Pt-Mask()^r, but right before the DispGraph, do a DrawInv. If you don't clear the screen after that and need to continue working with it, just call another DrawInv to convert it back again to the light version.

Couldn't you work with the Pt-Mask routine normally without resorting to inverting the entire screen? If I remember correctly it does support sprites that are white and transparent.

Quigibo · « **Reply #2861 on:** December 17, 2011, 09:55:51 pm »

Oh wait, you're right. You just have to change the sprite beforehand to map transparent to 0,0 on the sprite+mask and white to 0,1 which is easy because you don't have to do that at runtime, just import your sprites in this format.

ztrumpet · « **Reply #2862 on:** December 17, 2011, 10:05:25 pm »

Quigibo, why don't you add an invert command like the rotC, rotCC, flipV, and flipH commands? This would make tasks like what Frey wants to do a lot easier and I can see it being just as useful as those other four commands.

leafy · « **Reply #2863 on:** December 17, 2011, 10:06:54 pm »

Oh here's something I've always really wanted - a RectOff command.

(Yes that sounds kinda weird)

Freyaday · « **Reply #2864 on:** December 17, 2011, 10:14:01 pm »

Quote from: leafiness0 on December 17, 2011, 10:06:54 pm

Oh here's something I've always really wanted - a RectOff command.

(Yes that sounds kinda weird)

That's what I asked for with RectW()

Author Topic: Features Wishlist (Read 691420 times)

epic7

Re: Features Wishlist

Builderboy

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LincolnB

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Builderboy

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Freyaday

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Builderboy

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LincolnB

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Builderboy

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Quigibo

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LincolnB

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Builderboy

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Quigibo

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ztrumpet

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leafy

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Freyaday

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