What is the method to introspect on exact floating point values with pico8's fixed point system?
x = 3.8 y = 6.8 x += 0.2 y += 0.2 rectfill(x*15,y*9,x*15+1,y*9+1,9) rectfill(4*15,7*9,4*15+1,7*9+1,12) print(x) print(y) |
Running this produces two squares that do not overlap, although print() of x or y shows that the value is equivalent to an integer. Is there a way to print the fractional section more accurately?
P#18478 2016-01-26 14:41 ( Edited 2016-01-27 00:44)
There isn't a built-in hex printer, but binary operations shl() and band() can be used to grab each nibble:
cls()
function print_hex(n)
local c="0123456789abcdef"
local s="0x"
for i=7,0,-1 do
local v = band(shr(n,i*4),0x.000f)
v = shl(v,16)
s=s..sub(c,v+1,v+1)
end
return(s)
end
a=0xdead.beef
print(print_hex(a))
a=a+0x.0001
print(print_hex(a))
a = 3.8
print(print_hex(a)) -- 0x0003cccc
a += 0.2
print(print_hex(a)) -- 0x0003ffff
|
P#18481 2016-01-26 19:44 ( Edited 2016-01-27 00:51)
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