Class: Termfront::Renderer

Inherits:
Object
  • Object
show all
Defined in:
lib/termfront/renderer.rb

Instance Method Summary collapse

Constructor Details

#initialize(stdout) ⇒ Renderer

Returns a new instance of Renderer.



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# File 'lib/termfront/renderer.rb', line 5

def initialize(stdout)
  @stdout = stdout
end

Instance Method Details

#cast_ray(map, ox, oy, rdx, rdy) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 86

def cast_ray(map, ox, oy, rdx, rdy)
  mx = ox.floor
  my = oy.floor

  ddx = rdx == 0 ? 1e30 : (1.0 / rdx).abs
  ddy = rdy == 0 ? 1e30 : (1.0 / rdy).abs

  if rdx < 0
    step_x = -1
    sd_x = (ox - mx) * ddx
  else
    step_x = 1
    sd_x = (mx + 1.0 - ox) * ddx
  end
  if rdy < 0
    step_y = -1
    sd_y = (oy - my) * ddy
  else
    step_y = 1
    sd_y = (my + 1.0 - oy) * ddy
  end

  side = 0
  64.times do
    if sd_x < sd_y
      sd_x += ddx
      mx += step_x
      side = 0
    else
      sd_y += ddy
      my += step_y
      side = 1
    end
    return [1e30, 0] if my < 0 || my >= map.height || mx < 0 || mx >= map.width

    next unless map.grid[my][mx] == "#"

    d = if side == 0
          (mx - ox + (1 - step_x) / 2.0) / rdx
        else
          (my - oy + (1 - step_y) / 2.0) / rdy
        end
    return [d.abs, side]
  end
  [1e30, 0]
end

#render(player:, map:, enemies:, projectiles:, drops:, terminals: [], status_line: nil, allies: []) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 9

def render(player:, map:, enemies:, projectiles:, drops:, terminals: [], status_line: nil, allies: [])
  rows, cols = @stdout.winsize
  rows = [rows, 6].max
  cols = [cols, 20].max

  radar_h = Config::RADAR_RADIUS * 2 + 1
  view_h = [rows - 3 - radar_h, 4].max
  view_w = cols
  virt_h = view_h * 2

  dx = Math.cos(player.angle)
  dy = Math.sin(player.angle)
  plane_x = -dy * Math.tan(Config::FOV / 2.0)
  plane_y = dx * Math.tan(Config::FOV / 2.0)

  dists = Array.new(view_w)
  sides = Array.new(view_w)
  view_w.times do |c|
    cam = 2.0 * c / view_w - 1.0
    dists[c], sides[c] = cast_ray(map, player.x, player.y, dx + plane_x * cam, dy + plane_y * cam)
  end

  vmid = virt_h / 2.0
  wtop = Array.new(view_w)
  wbot = Array.new(view_w)
  wcol = Array.new(view_w)
  view_w.times do |c|
    d = dists[c]
    lh = d > 0.01 ? (virt_h / d).to_i : virt_h
    wtop[c] = [(vmid - lh / 2.0).to_i, 0].max
    wbot[c] = [(vmid + lh / 2.0).to_i, virt_h].min
    wcol[c] = Sprite.wall_brightness(d, sides[c])
  end
  pixels = build_view_pixels(virt_h, view_w, wtop, wbot, wcol)
  overlay_enemies_3d(pixels, view_h, view_w, dists, player, enemies, projectiles, drops)
  overlay_allies_3d(pixels, view_h, view_w, dists, player, allies)
  overlay_damage_flash(pixels, view_h, view_w, player)

  buf = TerminalOutput.begin_frame(home: true)

  render_hud(buf, cols, player, drops, terminals, status_line)
  render_view(buf, view_h, view_w, pixels)
  buf << "\e[#{3 + view_h};1H"
  render_radar(buf, cols, radar_h, player, enemies, drops, terminals, allies)
  render_crosshair(buf, view_h, view_w, cols, player)

  buf << TerminalOutput.end_frame
  TerminalOutput.write_all(@stdout, buf)
end

#render_blank(rows, cols) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 67

def render_blank(rows, cols)
  buf = TerminalOutput.begin_frame(home: true)
  rows.times do |row|
    buf << "\e[#{row + 1};1H"
    buf << (" " * cols)
  end
  buf << TerminalOutput.end_frame
  TerminalOutput.write_all(@stdout, buf)
end

#render_centered_message(rows, cols, msg, color) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 77

def render_centered_message(rows, cols, msg, color)
  buf = TerminalOutput.begin_frame(home: true, clear: true)
  r = rows / 2
  c = [(cols - msg.size) / 2 + 1, 1].max
  buf << "\e[#{r};#{c}H#{color}#{msg}\e[0m"
  buf << TerminalOutput.end_frame
  TerminalOutput.write_all(@stdout, buf)
end

#render_game_over(rows, cols) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 59

def render_game_over(rows, cols)
  render_centered_message(rows, cols, "GAME OVER", "\e[1;91m")
end

#render_mission_complete(rows, cols) ⇒ Object 



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# File 'lib/termfront/renderer.rb', line 63

def render_mission_complete(rows, cols)
  render_centered_message(rows, cols, "MISSION COMPLETE", "\e[1;92m")
end