class ZXLib::Gfx::Draw

A module with Z80 Macros for drawing lines and plotting pixels on the ZX Spectrum.¶ ↑

Example:

require 'zxlib/gfx/draw'
require 'zxlib/basic'

include ZXLib

class DrawLine
  include Z80
  include Z80::TAP
  macro_import    ZXLib::Gfx::Draw

  with_saved :start, :exx, hl, ret: true do
                  ld   hl, [points[0]]
                  ld   de, [points[1]]
                  call draw.line_to
  end

  points          data ZXLib::Sys::Coords, 2, {x:0, y:0}, {x:255, y:191}

  draw            make_draw_line_subroutines(scraddr: 0x4000, check_oos: true)
end
drawline = DrawLine.new 0x8000
puts drawline.debug
program = Basic.parse_source <<-END
   10 INPUT "x0:";x0;" y0:";y0, "x1:";x1;" y1:";y1
      POKE #{drawline['points.x']}, x0: POKE #{drawline['points.y']}, y0
      POKE #{drawline['points.x']+2}, x1: POKE #{drawline['points.y']+2}, y1
      RANDOMIZE USR #{drawline[:start]}
      PAUSE 0: GO TO 10
 9998 STOP
 9999 CLEAR #{drawline.org-1}: LOAD ""CODE: RUN
END
program.save_tap 'drawline', line: 9999
drawline.save_tap 'drawline', append: true