gmexe

sx=room_width
sy=room_height
sd=32
h=0.01
a=10.0
b=28.0
c=8.0/3.0
n=10000
x0=0.1
y0=0
z0=0

var x1, y1, z1, xp, yp;

  if keyboard_check(vk_right) then a+=0.1
  if keyboard_check(vk_left) then a-=0.1
  if keyboard_check(vk_up) then b+=0.1
  if keyboard_check(vk_down) then b-=0.1
  if keyboard_check(vk_pageup) then c+=0.1
  if keyboard_check(vk_down) then c-=0.1

for (i=0; i<n-1; i+=1)
{
  x1=x0+h*a*(y0-x0)
  y1 = y0 + h * (x0 * (b - z0) - y0);
  z1 = z0 + h * (x0 * y0 - c * z0)
  x0 = x1
  y0 = y1
  z0 = z1

  xp=x0*10+round(sx/2)
  yp=y0*10+round(sy/2)

  if (i>100) and xp>0 and xp<sx and yp>0 and yp<sy
  {
  draw_primitive_begin(pr_pointlist)
  draw_vertex_color(xp,yp, make_color_rgb(255,0,i/100*16777000),1)
  draw_primitive_end()
  }
}