PSET Circle!

[Rattrapmax6]

Okay, a simple game that shouldn't take but 5mins of your time.

Object: Make a circle using PSET
RULES:

1. Ten lines or under to be fair... (Can be done in six :wink: )
2. No use of colins " : " <- those
3. Any radius you want if its in the screen
4. Must be round if that makes since..
5. Only one PSET can be used..
6. QB or FB, just note on which, or use the matching Syntax tag.

Get all that? Now try it.. .. Good luck!

[Diroga]

Code:

CLS
SCREEN 13
rad = (3.14159265#) / 180
FOR i = 1 TO 361 STEP .5
oldx = x: oldy = y
x = INT(50 * (COS(rad * i))) + 160
y = INT(50 * (SIN(rad * i))) + 100
PSET (x, y), 15
NEXT

[Dr_Davenstein]

OK, why not?  

Code:

Screen 18, 32
Do While InKey$=""
   Y=(Y+1)Mod 480
   For X = 0 to 639
     If ABS(SQR((320-X)^2 + (240-Y)^2))<= 255 then PSet(X,Y),RGB(0,0,255-ABS(SQR((320-X)^2 + (240-Y)^2)))
   Next
Loop

[xteraco]

here's mine

Code:

screen 13
dim as integer x, y, xmov, ymov
dim as double angle
x = 25 : y = 25
do : angle = angle + .01
   xmov = x * sin(angle) + y * cos(angle)
   ymov = y * sin(angle) - y * cos(angle)
pset (xmov + 160,ymov + 100),4 : loop

yay, its a circle  :bounce:

ah crap... no colons, well, i guess its back to the drawing board

[xteraco]

and w/ a little more work (3 minits) i've came up w/ the answer

Code:

screen 13
dim as integer xmov,ymov,angle
do
   angle = angle + 1
   xmov = 25 * sin(angle) + 25 * cos(angle)
   ymov = 25 * sin(angle) - 25 * cos(angle)
   pset (xmov + 160,ymov + 100),4
loop

does that qualify.... i win! :bounce:
uh, make this official freebasic submission

[xteraco]

ah, and here's my qbasic version

Code:

screen 13
for i = 1 to 360
xmov = 25 * sin(i) + 25 * cos(i)
ymov = 25 * sin(i) - 25 * cos(i)
pset (xmov + 160,ymov + 100),4
next

so, make it official, this is my qbasic submission

[Sterling Christensen]

Code:

SCREEN 13
PSET STEP(0, 0), 15

Sure the pixel may be square, but it's the best approximation possible of a circle with radius 0.5 pixels. :bounce:

[xteraco]

well, Sterling beat me :normal:

[KiZ]

(Can be done in six :wink: )

Six? Six is for noobs j/k

Code:

SCREEN 13
FOR i = 1 TO 360
  PSET (SIN(i * 3.14 / 180) * 30 + 160, COS(i * 3.14 / 180) * 30 + 100)
NEXT

[Meg]

3 lines:
[syntax="QBASIC"]FOR i! = -.5 TO 360 STEP .5
     IF i! = -.5 THEN SCREEN 13 ELSE PSET (160 + COS(i! * 3.14 / 180) * 50, 100 + SIN(i! * 3.14 / 180) * 50), 15
NEXT i![/syntax]

[Neo]

3 lines, using another algorithm:

[syntax="QBASIC"]FOR I! = -0.5 TO 199.5 STEP .5
   IF I! = -0.5 THEN SCREEN 13 ELSE PSET (((INT(I!) = I!) * 2 + 1) * SQR(10000 - (INT(I!) - 100) ^2) + 160, INT(I!) * 0.75), 15
NEXT I![/syntax]

Doesn't draw the circle completely, in this case it needs some more code to optimize this block, but it draws the outlines which can be connected with line or by enhancing the above code.
Advantage of this x = SQR(r^2-y^2) algorithm is that it's faster and doesn't require large loops.

In these kind of challenges it's impossible to draw a full connected circle, because if you zoom in on the circles made with the COS/SIN algorithm you'll see the same as the algorithm above displays.

[Rattrapmax6]

Heh, 3 lines, I never thought of stuffing it like that,. oh well,. here was mine:

[syntax="qbasic"]SCREEN 13
FOR a = 1 TO 360
x = 20 * COS(a * 3.14159265# / 180)
y = 20 * SIN(a * 3.14159265# / 180)
PSET (160 + x, 100 - y), a
NEXT[/syntax]

I wasn't planning to have a winner (more just a challange, all under 10 lines won), but Meg deserves to gets the highest points! 3 lines, *walks off scratching head*...

[Meg]

Meh.  My entry doesn't deserve any special mention, really.  In order to cram it into three lines, I had to remove a lot of clarity.  I'd never actually write it like that for a porgram.

The idea for using a loop and a IF THEN ELSE IF ... ELSE line isn't even mine.  I first came across it in the screensaver challenges, I think.  Might have been Relsoft's, or somebody else's idea.

Basically, the first few solutions all do exactly the same thing.. calculate X and Y based on trig functions from an angle converted to radians, then PSET at (x,y).  I'm not sure what Neo's does, but it looks like he's using the formula for a circle to plot the points instead of SIN and COS.

*peace*

Meg.

[Rattrapmax6]

OK, why not?  

Code:

Screen 18, 32
Do While InKey$=""
   Y=(Y+1)Mod 480
   For X = 0 to 639
     If ABS(SQR((320-X)^2 + (240-Y)^2))<= 255 then PSet(X,Y),RGB(0,0,255-ABS(SQR((320-X)^2 + (240-Y)^2)))
   Next
Loop

  AHH!!! A BIG BLUE BLOB!!!!  :lol:

Thats pretty cool!! :rotfl:  :wink:

[Mitth'raw'nuruodo]

heh, its FB...

I think Sterling won.
[/code]