Text Rotation Fun
#1
Code:
'text rotation fun.bas for SmallBASIC 0.12.11 (B+=MGA) 2017-02-02

'global variables
message = "abcdefghijklmnopqrstuvwxyz""
secWide = txtw(message) + 2
secHigh = txth(message) + 2
dim sect(secWide, secHigh) 'array to store message points
color rgb(200, 200, 200),0 : cls
rect 0, 0, secWide, secHigh, 9

? message
loadSect 0, 0 'load array
'debug checks
'for y = 0 to secHigh
'  for x = 0 to secWide
'    if sect(x, y) then pset x + 200, y + 200
'  next
'next
'input "OK ";ok

dim plasma(5, 3)
for i = 0 to 5
 plasma(i, 0) = rnd * rnd
 plasma(i, 1) = rnd * rnd
 plasma(i, 2) = rnd * rnd
next

cls
cx = xmax/2 : cy = ymax/2
while 1
 cls
 dp 0
 yaxis cx, cy/4, a, 2
 dp 1
 xaxis cx, 3*cy/4, a, 5
 dp 2
 rotate cx/2, cy, a, 1
 dp 3
 rotate 3*cx/2, cy, a -90, 2.5
 dp 4
 rotate cx, cy/2, -4*a + 90, 2
 dp 5
 rotate cx, 3*cy/2, 2*a + 180, 4.5
 showpage
 delay 10
 a = a + 1
 if a = 360 then a = 0
wend
pause

sub dp(i)
 color rgb(128 + 127*sin(plasma(i,0)*a), 128 + 127*sin(plasma(i, 1)*a), 128 + 127*sin(plasma(i, 2)*a))
end

sub loadSect(xstart, ystart)
 local x, y, p, black
 'these are all global
 black = rgb(100 ,100, 100)
 for y = 0 to secHigh
   for x = 0 to secWide
     p = POINT(xstart + x, ystart + y)
     if p < black then sect(x, y) = 1 '<== data from screen points
   next
 next
end

sub rotate(cx, cy, angle, scale) 'and scale
 local cax, cay, ra, cc, d, anew, ax,ay

 cax = secWide/2 : cay = secHigh/2  'array center
 for y = 0 to secHigh
   for x = 0 to secWide
     cc = sect(x,y)
     if (x-cax) <> 0  and cc <> 0 then
       d = ((x-cax)^2+(y-cay)^2)^.5
       anew = atan((y-cay)/(x-cax))
       if x-cax <  0 and y-cay  < 0 then anew = anew + pi+rad(angle)  '-x,-y
       if x-cax <  0 and y-cay >= 0 then anew = anew + pi+rad(angle) '-x,+y
       if x-cax >= 0 and y-cay  < 0 then anew = anew + rad(angle)    '+x,-y
       if x-cax >= 0 and y-cay >= 0 then anew = anew + rad(angle)   '+x,+y
       ax = d*cos(anew):ay=d*sin(anew)
       rect int(cx+ax*scale),int(cy+ay*scale) step scale+1, scale+1 filled
     end if
   next
 next
end

sub yaxis(cx, cy, angle, scale)
  local cax, cay, cc, ax,ay

 cax = secWide/2 : cay = secHigh/2  'array center
 for y = 0 to secHigh
   for x = 0 to secWide
     cc = sect(x,y)
     if cc <> 0 then
       ax = (x - cax)*cos(rad(angle)):ay= (y - cay)
       rect int(cx+ax*scale),int(cy+ay*scale) step scale+1, scale+1 filled
     end if
   next
 next
end

sub xaxis(cx, cy, angle, scale)
  local cax, cay, cc, ax,ay

 cax = secWide/2 : cay = secHigh/2  'array center
 for y = 0 to secHigh
   for x = 0 to secWide
     cc = sect(x,y)
     if cc <> 0 then
       ax = (x - cax) :ay = (y - cay) * sin( rad(angle))
       rect int(cx+ax*scale),int(cy+ay*scale) step scale+1, scale+1 filled
     end if
   next
 next
end  

Rotate text about a point, x axis, y axis (at a point), also rotating colors.


Attached Files Thumbnail(s)

B += x
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