[REBOL] Re: Request-color use
From: gjones05:mail:orion at: 9-May-2001 17:40
From: "Ronald Gruss"
> Hi,
>
> How could I change the filter color in the script below using
request-color ?
> I'm not used enough to rebol to understand everything in
request-color's source.
>
> Thanks in advance.
>
> image1: load-image %./images/couleurprimaire.gif
> image2: load-image %./images/couleursecondaire.gif
>
> faces: layout [
> size 450x480
> backdrop water
> img: image 300x300 image1
> below
> across
> button image1 70x70 [img/image: image1 show img]
> button image2 70x70 [img/image: image2 show img]
> return
>
> ; pad 0x20 space 0x2
> label yellow "Utiliser les boutons pour changer l'image à analyser"
> return
> label yellow "Maintenir le bouton gauche de la souris enfoncé pour
déplacer les filtres"
> ; at image1/size * 0x1 + 10x120
> return
> pos: vh2 90x24
> ]
>
> vid-face: get-style 'face
>
> append faces/pane v-face: make vid-face [
> size: 90x90
> pos/text: offset: 340x20
> edge: make edge [color: 250.120.40 size: 4x4]
> color: font: para: text: data: image: none
> effect: [multiply 255.0.0]
> feel: make feel [
> engage: func [f a e] [ ;intercepts target face events
> if find [over away] a [
> pos/text: f/offset: confine f/offset + e/offset - f/data f/size
> 0x0 f/parent-face/size
> f/effect: [multiply 255.0.0]
> show [f pos]
> ]
>
> if a = 'down [f/data: e/offset]
> ]
> ]
> ]
>
> view faces
>
> Bye bye
Hi, Ronald,
I had to do a little experimenting to figure this out, because it
certainly wasn't obvious to me at first glance. The solution that I
think you are looking for is remarkably simple in this case. I
shortened the example considerably in order to focus on the key feature
that I discovered. Reading the source code for IMAGE it appears as
though the effect is initialized by joining the default effect with any
new effect, as in:
if color [effect: join effect ['colorize color]]
In order to affect the correct face, I merely added a path on the
pertinent portion.
Here is my abbreviated sample code:
image1: load-thru/binary http://www.rebol.com/view/nyc.jpg
faces: layout [
size 450x480
backdrop water
img: image 300x300 image1
below
across
button image1 70x70 [
img/image: image1
new-color: request-color
img/effect: join img/effect ['colorize new-color]
show img
]
return
label yellow "Utiliser les boutons pour changer l'image à analyser"
return
pos: vh2 90x24
]
view faces
Hope this helps.
--Scott Jones
