Get Pixel colour

faz808

Hi there. Is there a way to check if a screen pixel is set or not. I realize FUZE lacks getPixel but there has to be an alternative command but for the life of me I can't find it. Thanks.

Retrocade_media

I wonder if the getbit commands would be of any use?

faz808

@Retrocade_media Do you mean bitGet? I can't find getbit...

Retrocade_media

@faz808 yea probably? I don't know how all that works but it might be useful

faz808

@Retrocade_media I'll try that. Thanks.

Martin

bitGet isn’t going to help you I’m afraid. There’s no way to do getPixel at the moment

faz808

@Martin I suspected that. Maybe in the future?

Martin

If you explain what you need it for then we might be able to help you find an alternative

faz808

@Martin I have 255 stars - circle(galaxy_x[I],galaxy_y[I], 2, 32 ,col,false) - randomly displayed. Using a cursor, move around the screen checking the present for a "star" and converting the x,y cords to a random star name.
I think I've managed it with:-

namepart = ["EN", "LA", "CAN" etc 64 letter combinations..
"WE", "DE"
]
 
pointx = 623
pointy = 351
circle (pointx, pointy, 8, 32, col, true) // my cursor
if joy.x then 
  drawText(422, 33, 26, white, "searching...")
  for i = 1 to 255 loop
     for dx = -8 to 8 loop
      if (point+dx) == galaxy_x[i] then
        for dy = -8 to 8 loop
          if (pointy+dy) == galaxy_y[i] then
            clear()
            starname = namepart[i/11] + namepart[i/5] + namepart[i/7] //generate starname from array parts
            drawText(822, 33, 26, white, i)
            drawText(900, 33, 26, white, starname)
            pointy = galaxy_y[i] // lock circle to star position
            pointx = galaxy_x[i]
         endif
       repeat
     endif
   repeat
 repeat
endif

My aim is to write a simple Elite clone. I don't think I need a getPixel command as such. Another problem is the lack of str lower case to upper. This would have been useful. An earlier suggestion solved the random number problem - lack of a seed. It would be nice to be able to save more than one file This would give me more than one repeatable galaxy.

faz808

@faz808 Sorry, I did indent it correctly but it seems to have gone wonky.

faz808

@faz808 Forget to add:-

if joy,right then
  clear()
  pointx += 1
endif
etc etc …

Cheers

xevdev

If you have all the stars x and y positions use distance() to find which is the closest to your circle.
If the Distance( star_xy, circle_xy ) is less than circle radii it's within your circle

faz808

@xevdev Thanks. That's shortened the code. I must learn to read the documentation !

Martin

You need to add code tags to the start and end, which is 3 'backticks' (obviously I can't type them) - i've done it for you.

SO, also, another way (admittedly, a rather wasteful way) would be to use sprites for the stars. Yes, it's wastefull if they are just a single pixel but it does make other operations such as scaling simpler should you need them and Fuze should easily cope with 255 of them. Then you can use collision detection against whatever your pointer might be. If you experiement with this then don't forget to removeSprite() when you are done with them because you are dealing with quite a lot of sprites.

Yeah, maybe not the best of ideas but it should work.

For strLower and strUpper, just write one. I'm sure there are already examples on the forum but I'm not sure how good the search is. Very, very quickly knocked up, without Fuze in front of me, something along the lines of...

function toLower(str)
    string new
    int n = 0
    int v = 0
    for n = 0 to len(str) loop
        v = chrVal(str[n])
        if v > 64 and v < 91 then new[n] = char(v + 32) endif
    repeat
return

Should be somewhere in the ballpark of what you need?

PS: Yeah, the language should really have some kind of upper and lower functionality really

faz808

@Martin Thanks. It's all coming together nicely now.

faz808

@Martin Upper to Lower works fine. To keep the first character as caps I changed one line to:-
new[n] = chr(v + (( n > 0) * 32 ))
Many thanks.

Martin

Oh, that's neat, i like that