Create a round Minimap

[Esper]

Hi..

uhm.. this request is a bit hard to explain.. so i use a picture as help for you:
http://img389.imageshack.us/img389/2702/hudgrundls5.png[/img]

I want to have a Minimap inside of the great circle left on the HUD Screen.
I thought of making a mask, that lies above a normal quadratic Minimap.. problem: The Mapcorners looked out left and right..

My Question:
Is there a way to cut the Minimap Sprites, so the map fits the circle?


What Map i use:
The Passable Minimap Script.

 

[BloodRage]

so we use this script in the game

http://www.rmxp.org/forums/index.php?topic=2930.0

he have forgot this link ;D


i work on this game too ;D

 

[Esper]

thanks BR..

So.. has anyone an idea?

 

[BloodRage]

hmmm can nobody help us 

we need this modifikation  :blush:

 

[Zeriab]

The best way would be to change the actual script itself so it did not draw outside a circle.
Alternatively you can this piece of code which should make everything outside of the biggest possible circle totally transparant.
It is slow, but the area of your circle may be sufficiently small for it to be a feasible solution.

class Bitmap
  ##
  # Makes all but the largest possible centered circle fully transparent
  # SLOW ~ Zeriab
  #
  def circle!
    color = Color.new(0,0,0,0)
    if self.width < self.height
      radius = self.width / 2
      off_x = 0
      off_y = (self.height / 2) - radius
      fill_rect(0,0,self.width,off_y,color)
      fill_rect(0,self.height-off_y,self.width,off_y,color)
    else
      radius = self.height / 2
      off_x = (self.width / 2) - radius
      off_y = 0
      fill_rect(0,0,off_x,self.height,color)
      fill_rect(self.width-off_x,0,off_x,self.height,color)
    end
    for i in 0...radius*2
      for j in 0...radius*2
        x = i + off_x
        y = j + off_y
        if (x-off_x-radius)**2+(y-off_y-radius)**2 > radius**2
          set_pixel(x,y,color)
        end
      end
    end
  end
end

*hugs*
- Zeriab

 

[Esper]

Isn´t there a faster way??
because the Minimap is updated every frame...

 

[Zeriab]

The best way would be to change the actual script itself so it did not draw outside a circle.
Alternatively you can this piece of code which should make everything outside of the biggest possible circle totally transparant.
It is slow, but the area of your circle may be sufficiently small for it to be a feasible solution.

class Bitmap
   ...
end

*hugs*
- Zeriab

Look at the bolded text.
The code I have given could also be written in an external language and then compiled to a DLL. If you are lucky you might get someone to do it for you. You could try asking poccil since I believe he has some experience with alterating bitmaps with a DLL.
It would still be better to do as I told before to change the script in question. It might be more complex though.
It is naturally faster to not draw the parts outside of the circles than drawing it first and then removing it. The exception being if you got some kind of hardware support making the other way faster.

I wish you luck with your request ^_^

*hugs*
- Zeriab