prog8/examples/c64/turtle-gfx.p8

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%import floats
%import graphics
%zeropage floatsafe
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main {
sub start() {
graphics.enable_bitmap_mode()
turtle.init()
turtle.pu()
turtle.pos(150, 110)
turtle.pd()
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ubyte i
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for i in 0 to 100 {
turtle.fd(i+20)
turtle.rt(94)
}
repeat {
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}
}
}
turtle {
float xpos
float ypos
float angle
bool pendown
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const uword SPRITE_MEMORY = $5800
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sub init() {
xpos = 160.0
ypos = 100.0
angle = 0.0
pendown = true
sys.memcopy(&turtlesprite, SPRITE_MEMORY, len(turtlesprite)) ; copy the sprite pixel data
c64.set_sprite_ptr(0, SPRITE_MEMORY) ; use dynamic setter because of changed vic memory layout
c64.SPENA = 1 ; sprites on
c64.SP0COL = 5 ; green sprite
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update_turtle_sprite()
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}
sub update_turtle_sprite() {
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uword xx = xpos as uword
c64.SPXY[0] = lsb(xx) + 12
c64.MSIGX = msb(xx) > 0
c64.SPXY[1] = ypos as ubyte + 40
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}
sub pos(float x, float y) {
if pendown {
graphics.line(xpos as uword, ypos as ubyte, x as uword, y as ubyte)
}
xpos = x
ypos = y
update_turtle_sprite()
}
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sub fd(uword length) {
float flen = length as float
float sx = xpos
float sy = ypos
xpos += flen * floats.sin(angle)
ypos -= flen * floats.cos(angle)
update_turtle_sprite()
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if pendown {
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graphics.line(sx as uword, sy as ubyte, xpos as uword, ypos as ubyte)
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}
}
sub rt(uword degrees) {
angle += floats.rad(degrees as float)
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}
sub lt(uword degrees) {
angle -= floats.rad(degrees as float)
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}
sub pu() {
pendown = false
}
sub pd() {
pendown = true
}
ubyte[] turtlesprite = [ %00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%01111110,%00000000,
%00000000,%11000011,%00000000,
%00000000,%11000011,%00000000,
%00000000,%11000011,%00000000,
%00000000,%01111110,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000,
%00000000,%00000000,%00000000 ]
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}