Path: chuka.playstation.co.uk!news
From: "Mario Wynands" <mario@sidhe.co.nz>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: Is this possible?
Date: Tue, 9 Feb 1999 13:13:14 +1300
Organization: Sidhe Interactive
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Jesse Palmer wrote in message <36bd6d86.3448161@news.scea.sony.com>...
>Thanks, that's a great idea!  I'm a beginner at the moment, I have a
>question.  Is it possible to simply draw a single poly? or do you need
>to create an object then rotate,trans,project it?


Just use a semi-trans GsBOXF (a 2d rectangle) and modify the colour values.
See below for snippet from "Fading.." thread on
scee.yaroze.programming.2d_graphics.


Robert Swan wrote in message <35a51a8f.15816166@www.playstation.co.uk>...
>On Sat, 9 May 1998 20:06:08 +0200, "Anders Clerwall"
><omgim@swipnet.se> wrote:
>
>>Hi.. I've seen some fading done in many Yaroze programs.. How's it done?
>>If I LoadImage(&pic, (u_long *)picaddr); how do I fade it up/down to/from
>>black??? I really wanna do this.. please help!
>
>The answer is not to modify the image that you are LoadImage-ing, but
>to draw a semitransparent rectangle over the top of it after it is
>copied to screen.
>
>Using the GsBOXF rectangle handler (found in your Library Reference,
>page 45) you can do the following -
>
>GsBOXF FadingRect;
>u_long tTemp1;
>
>FadingRect.x = FadingRect.y = 0;
>// top left corner at (0,0)
>
>FadingRect.w = 320;
>FadingRect.h = 240;
>// specify width and height. This will vary depending on screen mode
>
>FadingRect.attribute += (1<<30) + (2<<28);
>// (1<<30) sets it to be drawn semitransparently
>// (2<<28) specifies the rectangle to subtract from the background
>
>for (tTemp1=0; tTemp1<256; tTemp1++)
> {
> FadingRect.r = FadingRect.g = FadingRect.b = (u_char) tTemp1;
> // set the colour of the box to go from transparent to opaque
> GsSortBoxFill(&FadingRect, &OTableHeader[CurrentBuffer], 0);
> // (see Lib Ref page 148) Send rectangle to ordering table at
> // front
> }
>
>Obviously the loop wouldnt work as it is, it needs to be incorporated
>into the screen drawing routine, so that every time the screen updates
>the rgb members of the rectangle increase each time. When the rgb
>values are 255 then the screen will be blank.
>
>Robert Swan
>rs108@mdx.ac.uk
>http://www.netyaroze-europe.com/~middex2


If you need more help feel free to email me.


Regards

Mario Wynands

Sidhe Interactive
Sony Playstation Software Development House

Email mario@sidhe.co.nz Website www.sidhe.co.nz