nd Mathewson
> To: "u >> How to use LiveCode"
> Subject: Yertle the Turtle
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> Having imported an SVG image of a tortoise into a stack . . .
>
> Being a fan of Seymour Papert . . .
>
Hi All,
Remember that Jim Hurley wrote a book:
http://jamesphurley.com/RunRev/TurtlePhysicsText.doc
and many stacks about Turtle Graphics:
http://jamesphurley.com/Revolution.html
Al
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Please vis
>Mike Wrote:
>Ah. Its sub pixel positioning. (a rose by any other name wouldn't be as
alliterative as a ppp name)
I banged my head against a wall for days trying to get smooth shading of 3d
objects correct. (assembler on a 1980's ECL super computer) until the light
went on and I used center pixel
nvm. ignore me. :) Something else entirely. (but the whole idea of
tracking the coords separately still applies)
(goes to bed)
On Tue, Jan 31, 2017 at 2:57 PM, Mike Bonner wrote:
> Ah. Its sub pixel positioning. (a rose by any other name wouldn't be as
> alliterative as a ppp name)
>
> On Tue,
Ah. Its sub pixel positioning. (a rose by any other name wouldn't be as
alliterative as a ppp name)
On Tue, Jan 31, 2017 at 2:35 PM, Mike Bonner wrote:
> Yeah, I think this is due to that change a while back (the partial pixel
> positioning stuff) it doesn't throw an error in your face if you se
Yeah, I think this is due to that change a while back (the partial pixel
positioning stuff) it doesn't throw an error in your face if you set to a
decimal coord anymore.
>
> Apparently fractional coordinates work fine, rounded reasonably well -
> this works:
>
>set the left of btn 1 to 100.0
> Colin H. wrote:
> I’m sure any system would not attempt to parse an infinite number of decimal
> places. The turtle would probably be placed at 1.41421356237 pixels. If you
> want to try more accurately than that, here’s the first million decimal
> places:
> https://apod.nasa.gov/htmltest/gifci
I’m sure any system would not attempt to parse an infinite number of decimal
places. The turtle would probably be placed at 1.41421356237 pixels. If you
want to try more accurately than that, here’s the first million decimal places:
https://apod.nasa.gov/htmltest/gifcity/sqrt2.1mil
> On Jan 31
If sqrt(2) is a bonkers number does anyone know how LOGO manages this?
Richmond.
On 1/31/17 5:36 pm, hh via use-livecode wrote:
Richmond wrote:
The problem is that (as far as I am aware) LiveCode cannot
move objects for fractions of pixels.
Even if it could, this would be not enough, because s
Quentin Long wrote:
> Suggestion for RM to try: Don't fuss about non-integer points—do all
> the necessary calculations "under the hood", and just let point-
> coördinates be assigned the resulting non-integer numbers as needed.
> With any luck, LC will make this "just work" on your screen.
Appa
Suggestion for RM to try: Don't fuss about non-integer points—do all the
necessary calculations "under the hood", and just let point-coördinates be
assigned the resulting non-integer numbers as needed. With any luck, LC will
make this "just work" on your screen.
"Bewitched" + "Charlie's Ang
Richmond Mathewson wrote:
> Being a fan of Seymour Papert . . .
>
> I thought I'd try and implement turtle graphics in Livecode.
Have you seen Jim Hurley's?:
http://jamesphurley.com/Revolution.html
--
Richard Gaskin
Fourth World Systems
Software Design and Development for the Desktop, Mobil
Whether you’re able to set subpixel or not, keep the intended location in
variables, and add your move to the variables, then set the location of the
turtle to the updated variables.
> On Jan 31, 2017, at 2:41 AM, Richmond Mathewson via use-livecode
> wrote:
>
> Thanks for the equations (I h
> Richmond wrote:
> The problem is that (as far as I am aware) LiveCode cannot
> move objects for fractions of pixels.
Even if it could, this would be not enough, because sqrt(2)
is an irrational number ;-)
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If I recall correctly, you can SET a location now that is a fraction of a
pixel.. Keep track of the decimals as your current location and use those
numbers (within reason) as your start point, and continue onward. (think
it was called partial pixel positioning?) While the actual location will
be
Thanks for the equations (I had in fact already worked those out), the
problem was
not that, the problem is that (as far as I am aware) LiveCode cannot
move objects
for fractions of pixels, so a move of , say, 30 forward at 30 degrees
might (and I haven't done
the Maths yet) either be 29, 30 or
It is, as you said, going to need sin and cos. The X movement would be 30 *
cos(37/180 * Pi), and the Y movement would be 30 * sin(37/180 * Pi), in your
example case.
> On Jan 30, 2017, at 11:14 PM, Richmond Mathewson via use-livecode
> wrote:
>
> The problem is not with drawing the line.
>
K heres the required parts..
*## takes length and the angle in radians and returns vector as x,y offsets*
function aLenToVector pLen pAngle
return pLen * sin(pAngle),pLen * cos(pAngle)
end aLenToVector
*## takes degrees and changes to radians*
function dToRadians pDegrees
return pDegrees
Yeah. Thats what my (as yet unrediscovered) library can help with.
On Mon, Jan 30, 2017 at 11:14 PM, Richmond Mathewson via use-livecode <
use-livecode@lists.runrev.com> wrote:
> The problem is not with drawing the line.
>
> The problem is how, when the turtle's "nose" is pointing at, say, 37
> d
The problem is not with drawing the line.
The problem is how, when the turtle's "nose" is pointing at, say, 37
degrees from the vertical
one can get it to move FORWARD for 30 units.
Richmond.
On 1/30/17 11:46 pm, Tore Nilsen via use-livecode wrote:
30. jan. 2017 kl. 21.20 skrev Richmond Math
Somewhere around here I have a library that should help with your turtle
moving. Will see if I can dig it up.
On Mon, Jan 30, 2017 at 2:46 PM, Tore Nilsen via use-livecode <
use-livecode@lists.runrev.com> wrote:
>
> > 30. jan. 2017 kl. 21.20 skrev Richmond Mathewson via use-livecode <
> use-live
> 30. jan. 2017 kl. 21.20 skrev Richmond Mathewson via use-livecode
> :
>
> 2.2. I wonder how my turtle will be seen to draw a pen line from the two ends
> of the "line".
If you would like the “turtle” to move to the points of the line then, lock
screen, draw the line, hide the line and unloc
Having imported an SVG image of a tortoise into a stack . . .
Being a fan of Seymour Papert . . .
I thought I'd try and implement turtle graphics in Livecode.
But came up against something awkward . . .
[As a caveat, I should like to point out I don't know how the following
is implemented
in
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