### Author Topic: Setting Xmin, Xmax, Ymin et.c  (Read 2026 times)

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#### SamTebbs33

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##### Setting Xmin, Xmax, Ymin et.c
« on: January 18, 2014, 11:43:16 am »
Hi!

Is it at all possible to change Xmin, Xmax, Ymin, Ymax, Xscl and Yscl from within an Axe program? I have tried several methods such as GetCalc("varXmin") but none seem to be doing what I need, is it at all possible and if so, what am I doing wrong?

Thanks!

#### ClrDraw

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #1 on: January 18, 2014, 12:16:33 pm »
IDK, sorry I tried several methods too but couldn't get it. Why do you need to do that in an Axe program?
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#### SamTebbs33

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #2 on: January 18, 2014, 12:27:18 pm »
I'm trying to draw a shape using lines but I can't change the variables, so I'm stuck with very little space to draw with (-10 to 10)

#### Sorunome

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #3 on: January 18, 2014, 12:28:52 pm »
Oh, no, on axe you have coordinates from 0-95 in x and 0-63 in y direction, so you can draw all that stuff without having to change xmin etc
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#### thepenguin77

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #4 on: January 18, 2014, 12:29:19 pm »
Someone will have to translate this to Axe, but those variables are stored at constant addresses. To see the addresses, CTRL + F "Xmin" on this page (it's the 5th instance).

I'm going to assume that GetCalc() returns the address of the variable, so using Xmin is probably as easy as replacing GetCalc() with 0x8F50.

Edit:
I don't know if the goal of this thread is actually to change Xmin anymore, but, if anyone wants to do it.

$$#AXE$$#
:E8F50->A
:1337->float{A}

This will store 1337 to Xmin
« Last Edit: January 18, 2014, 12:41:05 pm by thepenguin77 »
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#### ClrDraw

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #5 on: January 18, 2014, 12:35:23 pm »
Quote
Oh, no, on axe you have coordinates from 0-95 in x and 0-63 in y direction, so you can draw all that stuff without having to change xmin etc
Sorunome's right, you don't need to change xmin in Axe. instead of a 10 by 10 grid, the screen is set up (like the basic text command) so that you program what pixel to draw the line on not what coordinate.
« Last Edit: January 18, 2014, 12:35:45 pm by ClrDraw »
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#### SamTebbs33

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #6 on: January 18, 2014, 02:00:48 pm »
Thanks guys! I didn't know that the screen dimensions were preset to exactly what I wanted them to be!

#### Xeda112358

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #7 on: January 18, 2014, 02:53:11 pm »
Also, as a note, this is how the coordinate system works at the hardware and assembly level. TI-BASIC converts coordinates for all of its drawing commands to pixel coordinates which takes up a lot of time. This is nice for math purposes, but inefficient for graphics.

To give you an idea, you could probably draw a line in Axe a few dozen times in the time TI-BASIC can draw a single Pt-On( command since it has to convert the inputs, then transform the inputs into pixel coordinates, then it converts those float values to integers that can actually be used directly, then it uses those coordinates to a pixel location and plots it. Axe only needs to do the last step (which is the fastest one).

#### ClrDraw

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #8 on: January 18, 2014, 03:17:39 pm »
Oh ti, what were they thinking!
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#### DJ Omnimaga

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #9 on: January 18, 2014, 03:38:33 pm »
Also, as a note, this is how the coordinate system works at the hardware and assembly level. TI-BASIC converts coordinates for all of its drawing commands to pixel coordinates which takes up a lot of time. This is nice for math purposes, but inefficient for graphics.

To give you an idea, you could probably draw a line in Axe a few dozen times in the time TI-BASIC can draw a single Pt-On( command since it has to convert the inputs, then transform the inputs into pixel coordinates, then it converts those float values to integers that can actually be used directly, then it uses those coordinates to a pixel location and plots it. Axe only needs to do the last step (which is the fastest one).
Also, in BASIC the LCD is updated on every line/pixel command, while in Axe you choose if you want the LCD updated or not during drawing. Updating everytime causes flicker in some cases and it's much slower.
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#### ClrDraw

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #10 on: January 18, 2014, 05:46:03 pm »
Quote
Also, in BASIC the LCD is updated on every line/pixel command, while in Axe you choose if you want the LCD updated or not during drawing. Updating everytime causes flicker in some cases and it's much slower.
Back when I did BASIC I hated that so much...
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#### Sorunome

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##### Re: Setting Xmin, Xmax, Ymin et.c
« Reply #11 on: January 18, 2014, 06:37:25 pm »
Quote
Also, in BASIC the LCD is updated on every line/pixel command, while in Axe you choose if you want the LCD updated or not during drawing. Updating everytime causes flicker in some cases and it's much slower.
Back when I did BASIC I hated that so much...
That is what i found so awesome when i found xLib, the whole update LCD stuff
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