mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-07-26 06:15:52 +00:00
6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
84 lines
2.9 KiB
Plaintext
84 lines
2.9 KiB
Plaintext
The [[TAN]] function returns the ratio of [[SIN]]e to [[COS]]ine or tangent value of an angle measured in radians.
|
|
|
|
|
|
{{PageSyntax}}
|
|
:: tangent! = TAN(''radian_angle!'')
|
|
|
|
|
|
* The ''radian_angle'' must be measured in radians. To convert from degrees to radians, multiply degrees * π/180.
|
|
* TANGENT is the gradient or slope of the circle or arc at [[SIN]](θ) / [[COS]](θ). Do not use division when the [[COS]] = 0 to avoid [[ERROR Codes|errors]].
|
|
|
|
|
|
''Example:'' Spiraling text using the [[SIN]] and [[TAN]] functions.
|
|
{{CodeStart}} '' ''
|
|
{{Cl|DIM}} {{Cl|SHARED}} text {{Cl|AS}} {{Cl|STRING}}
|
|
text$ = "S P I R A L"
|
|
{{Cl|DIM}} {{Cl|SHARED}} word(1 {{Cl|TO}} {{Cl|LEN}}(text$) * 8, 1 {{Cl|TO}} 16)
|
|
|
|
{{Cl|CALL}} analyse
|
|
{{Cl|CLS}}
|
|
{{Cl|CALL}} redraw
|
|
|
|
{{Cl|SUB}} analyse
|
|
{{Cl|CLS}}
|
|
{{Cl|SCREEN}} 12
|
|
{{Cl|COLOR}} 2: {{Cl|LOCATE}} 1, 1: {{Cl|PRINT}} text$
|
|
{{Cl|DIM}} px {{Cl|AS}} {{Cl|INTEGER}}, py {{Cl|AS}} {{Cl|INTEGER}}, cnt {{Cl|AS}} {{Cl|INTEGER}}, ltrcnt {{Cl|AS}} {{Cl|INTEGER}}
|
|
px = 1: py = 1
|
|
DO
|
|
word(px, py) = {{Cl|POINT}}(px, py)
|
|
{{Cl|PSET}} (px, py), 1
|
|
px = px + 1
|
|
{{Cl|IF...THEN|IF}} px = {{Cl|LEN}}(text$) * 8 {{Cl|THEN}}
|
|
px = 1
|
|
py = py + 1
|
|
{{Cl|END IF}}
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} py = 16
|
|
{{Cl|END SUB}}
|
|
|
|
{{Cl|SUB}} redraw
|
|
{{Cl|CLS}}
|
|
{{Cl|DIM}} row {{Cl|AS}} {{Cl|INTEGER}}, cnt {{Cl|AS}} {{Cl|INTEGER}}, cstart {{Cl|AS}} {{Cl|SINGLE}}, cend {{Cl|AS}} {{Cl|SINGLE}}
|
|
{{Cl|DIM}} xrot {{Cl|AS}} {{Cl|INTEGER}}, yrot {{Cl|AS}} {{Cl|INTEGER}}, SCALE {{Cl|AS}} {{Cl|INTEGER}}, pan {{Cl|AS}} {{Cl|INTEGER}}
|
|
cstart = 0: cend = 6.2
|
|
xrot = 6: yrot = 6: SCALE = 3: pan = 30
|
|
{{Cl|OUT}} {{Cl|&H}}3C8, 1: {{Cl|OUT}} {{Cl|&H}}3C9, 10: {{Cl|OUT}} {{Cl|&H}}3C9, 10: {{Cl|OUT}} {{Cl|&H}}3C9, 60
|
|
DO
|
|
row = 2
|
|
DO
|
|
DO
|
|
{{Cl|FOR...NEXT|FOR}} i = cend {{Cl|TO}} cstart {{Cl|STEP}} -.03
|
|
x = (SCALE * 60 - (row * xrot / 4)) * {{Cl|TAN}}({{Cl|COS}}(i))
|
|
y = {{Cl|SIN}}(SCALE * 60 - (row * yrot)) * {{Cl|TAN}}({{Cl|SIN}}(i)) * pan
|
|
cnt = cnt + 1
|
|
{{Cl|IF...THEN|IF}} word(cnt, row) > 0 {{Cl|THEN}}
|
|
{{Cl|CIRCLE}} (x + 320, y + 220), SCALE + 1, 1 'circled letters
|
|
'{{Cl|LINE}} (x + 320, y + 220)-{{Cl|STEP}}(12, 12), 1, BF 'boxed letters
|
|
{{Cl|END IF}}
|
|
{{Cl|IF...THEN|IF}} cnt = {{Cl|LEN}}(text$) * 8 {{Cl|THEN}} cnt = 0: {{Cl|EXIT DO}}
|
|
{{Cl|NEXT}}
|
|
{{Cl|LOOP}}
|
|
row = row + 1
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} row = 16
|
|
cend = cend + .1
|
|
cstart = cstart + .1
|
|
now! = {{Cl|TIMER}}
|
|
DO
|
|
newnow! = {{Cl|TIMER}}
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} newnow! - now! >= .15
|
|
{{Cl|LINE}} (1, 100)-(639, 280), 0, BF
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|INKEY$}} = {{Cl|CHR$}}(27)
|
|
{{Cl|END SUB}} '' ''
|
|
{{CodeEnd}}
|
|
{{small|Code by Unseen Machine}}
|
|
|
|
|
|
{{PageSeeAlso}}
|
|
* [[SIN]], [[COS]]
|
|
* [[ATN]] {{text|(arctangent)}}
|
|
* [[Mathematical Operations]]
|
|
* [[Text Using Graphics]]
|
|
* [[Mathematical_Operations#Derived_Mathematical_Functions|Derived Mathematical Functions]]
|
|
|
|
|
|
{{PageNavigation}} |