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stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2135

Posted: 04:02pm 23 Mar 2023

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Hi, I tried bresenham line code,not basic but think I converted it but gives out of memory error.
I want to plot the x,y co-ordinates from x1,y1 to x2,y2 but use for sprite co-ords
and move each loop or slower.
OPTION EXPLICIT
OPTION DEFAULT NONE
OPTION DEFAULT INTEGER
dim dy, dx, incrE, incrNE, d, x, y
dim x1,x0,y1,y0
cls rgb(black)
'The procedure takes the start points (x0,y0) and end points(x1,y1) of the line as arguments.
'draw_line (x0,y0,x1,y1)

x0=160:y0=200:x1=50:y1=40 'test line

'The internal variables dy, dx, incrE, incrNE, d, x, y. dx is the change in x, dy the change in y. d determines if the next pixel is on the same line or rises one. The variables incrE and incrNE are used to change the value of d. x and y are the point to be plotted, initially the first point given.
dx = x1 - x0
dy = y1 - y0
d = 2 * dy - dx
incrE = 2*dy
incrNE = 2*(dy - dx)
x = x0
y = y0
pixel (x,y,rgb(yellow))
'The while loop does the work. x is incremented each time through the loop. Because the plot happens at the end of the loop, x is incremented before each plot.
do while (x < x1)
{
'If d is less than one d is increased by incrE, y remains the same, and x is incremented.
if (d <= 0)
d=d+incrE
x=x+1
'Otherwise d is increased by incrNE, and both x and y are incremented.
else
d=d+incrNE
x=x+1
y=y+1
endif
pixel(x,y,rgb(yellow))
loop

stanleyella

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Joined: 25/06/2022
Location: United Kingdom
Posts: 2135

Posted: 04:17pm 23 Mar 2023

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if there's a missile command game in mmbasic the slow line code would be there.

thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 4047

Posted: 04:24pm 23 Mar 2023

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stanleyella said if there's a missile command game in mmbasic the slow line code would be there.

Yes for the CMM2, by @Vegipete, but it may be unreadable because the BASIC was "compressed" to meet the size requisites of the 2021 Programming Challenge: https://multimite.strongedge.net/greenhills.html

Best wishes,

Tom

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 4047

Posted: 05:57pm 23 Mar 2023

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Not sure if that was your actual code that you posted, but there is an errant '{' after the DO WHILE. Possibly the problem is an incorrectly reported syntax error?

Also don't forget you can use the INC command for incrementing and decrementing variables.

Best wishes,

Tom
Edited 2023-03-24 03:57 by thwill

Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

lizby
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Joined: 17/05/2016
Location: United States
Posts: 3152

Posted: 06:22pm 23 Mar 2023

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thwill said

stanleyella said if there's a missile command game in mmbasic the slow line code would be there.

Yes for the CMM2, by @Vegipete, but it may be unreadable because the BASIC was "compressed" to meet the size requisites of the 2021 Programming Challenge

There's a less compressed version of VegiPete's In Defense of the Green Hills for the F4 here

I'm not sure how successfully it could be made to run on the PicoMite--it was slow on the Armmite F4--but the firmware has been tweaked considerably since then. For speed, it would need VGA or an SSD1963 (Mick has a PicoMite design). The algorithm for slow line draw from there should be fine.

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

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