check_eq(#Lines[1].shapes, 1, 'F - test_draw_line/#shapes')
  check_eq(#Lines[1].points, 2, 'F - test_draw_line/#points')

  check_eq(#drawing.shapes, 1, 'F - test_draw_line/#shapes')
  check_eq(#drawing.points, 2, 'F - test_draw_line/#points')

  check_eq(#Lines[1].shapes, 1, 'F - test_draw_horizontal_line/#shapes')
  check_eq(#Lines[1].points, 2, 'F - test_draw_horizontal_line/#points')

  check_eq(#drawing.shapes, 1, 'F - test_draw_horizontal_line/#shapes')
  check_eq(#drawing.points, 2, 'F - test_draw_horizontal_line/#points')

  check_eq(#Lines[1].shapes, 1, 'F - test_draw_circle/#shapes')
  check_eq(#Lines[1].points, 1, 'F - test_draw_circle/#points')

  check_eq(#drawing.shapes, 1, 'F - test_draw_circle/#shapes')
  check_eq(#drawing.points, 1, 'F - test_draw_circle/#points')

  check_eq(#Lines[1].shapes, 1, 'F - test_draw_circle_mid_stroke/#shapes')
  check_eq(#Lines[1].points, 1, 'F - test_draw_circle_mid_stroke/#points')

  check_eq(#drawing.shapes, 1, 'F - test_draw_circle_mid_stroke/#shapes')
  check_eq(#drawing.points, 1, 'F - test_draw_circle_mid_stroke/#points')

  check_eq(#Lines[1].shapes, 1, 'F - test_draw_arc/#shapes')
  check_eq(#Lines[1].points, 2, 'F - test_draw_arc/#points')

  check_eq(#drawing.shapes, 1, 'F - test_draw_arc/#shapes')
  check_eq(#drawing.points, 2, 'F - test_draw_arc/#points')

function test_draw_polygon()
  io.write('\ntest_draw_polygon')
  -- display a drawing followed by a line of text (you shouldn't ever have a drawing right at the end)
  App.screen.init{width=Margin_left+300, height=300}
  Lines = load_array{'```lines', '```', ''}
  Line_width = 256  -- drawing coordinates 1:1 with pixels
  App.draw()
  check_eq(Current_drawing_mode, 'line', 'F - test_draw_polygon/baseline/drawing_mode')
  check_eq(#Lines, 2, 'F - test_draw_polygon/baseline/#lines')
  check_eq(Lines[1].mode, 'drawing', 'F - test_draw_polygon/baseline/mode')
  check_eq(Lines[1].y, Margin_top+Drawing_padding_top, 'F - test_draw_polygon/baseline/y')
  check_eq(Lines[1].h, 128, 'F - test_draw_polygon/baseline/y')
  check_eq(#Lines[1].shapes, 0, 'F - test_draw_polygon/baseline/#shapes')
  -- first point
  App.run_after_mouse_press(Margin_left+5, Margin_top+Drawing_padding_top+6, 1)
  App.run_after_keychord('g')  -- polygon mode
  -- second point
  App.mouse_move(Margin_left+65, Margin_top+Drawing_padding_top+36)
  App.run_after_keychord('p')  -- add point
  -- final point
  App.run_after_mouse_release(Margin_left+35, Margin_top+Drawing_padding_top+26, 1)
  local drawing = Lines[1]
  check_eq(#drawing.shapes, 1, 'F - test_draw_polygon/#shapes')
  check_eq(#drawing.points, 3, 'F - test_draw_polygon/vertices')
  local shape = drawing.shapes[1]
  check_eq(shape.mode, 'polygon', 'F - test_draw_polygon/shape_mode')
  check_eq(#shape.vertices, 3, 'F - test_draw_polygon/vertices')
  local p = drawing.points[shape.vertices[1]]
  check_eq(p.x, 5, 'F - test_draw_polygon/p1:x')
  check_eq(p.y, 6, 'F - test_draw_polygon/p1:y')
  local p = drawing.points[shape.vertices[2]]
  check_eq(p.x, 65, 'F - test_draw_polygon/p2:x')
  check_eq(p.y, 36, 'F - test_draw_polygon/p2:y')
  local p = drawing.points[shape.vertices[3]]
  check_eq(p.x, 35, 'F - test_draw_polygon/p3:x')
  check_eq(p.y, 26, 'F - test_draw_polygon/p3:y')
end
function test_draw_rectangle()
  io.write('\ntest_draw_rectangle')
  -- display a drawing followed by a line of text (you shouldn't ever have a drawing right at the end)
  App.screen.init{width=Margin_left+300, height=300}
  Lines = load_array{'```lines', '```', ''}
  Line_width = 256  -- drawing coordinates 1:1 with pixels
  App.draw()
  check_eq(Current_drawing_mode, 'line', 'F - test_draw_rectangle/baseline/drawing_mode')
  check_eq(#Lines, 2, 'F - test_draw_rectangle/baseline/#lines')
  check_eq(Lines[1].mode, 'drawing', 'F - test_draw_rectangle/baseline/mode')
  check_eq(Lines[1].y, Margin_top+Drawing_padding_top, 'F - test_draw_rectangle/baseline/y')
  check_eq(Lines[1].h, 128, 'F - test_draw_rectangle/baseline/y')
  check_eq(#Lines[1].shapes, 0, 'F - test_draw_rectangle/baseline/#shapes')
  -- first point
  App.run_after_mouse_press(Margin_left+35, Margin_top+Drawing_padding_top+36, 1)
  App.run_after_keychord('r')  -- rectangle mode
  -- second point/first edge
  App.mouse_move(Margin_left+42, Margin_top+Drawing_padding_top+45)
  App.run_after_keychord('p')
  -- override second point/first edge
  App.mouse_move(Margin_left+75, Margin_top+Drawing_padding_top+76)
  App.run_after_keychord('p')
  -- release (decides 'thickness' of rectangle perpendicular to first edge)
  App.run_after_mouse_release(Margin_left+15, Margin_top+Drawing_padding_top+26, 1)
  local drawing = Lines[1]
  check_eq(#drawing.shapes, 1, 'F - test_draw_rectangle/#shapes')
  check_eq(#drawing.points, 5, 'F - test_draw_rectangle/#points')  -- currently includes every point added
  local shape = drawing.shapes[1]
  check_eq(shape.mode, 'rectangle', 'F - test_draw_rectangle/shape_mode')
  check_eq(#shape.vertices, 4, 'F - test_draw_rectangle/vertices')
  local p = drawing.points[shape.vertices[1]]
  check_eq(p.x, 35, 'F - test_draw_rectangle/p1:x')
  check_eq(p.y, 36, 'F - test_draw_rectangle/p1:y')
  local p = drawing.points[shape.vertices[2]]
  check_eq(p.x, 75, 'F - test_draw_rectangle/p2:x')
  check_eq(p.y, 76, 'F - test_draw_rectangle/p2:y')
  local p = drawing.points[shape.vertices[3]]
  check_eq(p.x, 70, 'F - test_draw_rectangle/p3:x')
  check_eq(p.y, 81, 'F - test_draw_rectangle/p3:y')
  local p = drawing.points[shape.vertices[4]]
  check_eq(p.x, 30, 'F - test_draw_rectangle/p4:x')
  check_eq(p.y, 41, 'F - test_draw_rectangle/p4:y')
end
function test_draw_rectangle_intermediate()
  io.write('\ntest_draw_rectangle_intermediate')
  -- display a drawing followed by a line of text (you shouldn't ever have a drawing right at the end)
  App.screen.init{width=Margin_left+300, height=300}
  Lines = load_array{'```lines', '```', ''}
  Line_width = 256  -- drawing coordinates 1:1 with pixels
  App.draw()
  check_eq(Current_drawing_mode, 'line', 'F - test_draw_rectangle_intermediate/baseline/drawing_mode')
  check_eq(#Lines, 2, 'F - test_draw_rectangle_intermediate/baseline/#lines')
  check_eq(Lines[1].mode, 'drawing', 'F - test_draw_rectangle_intermediate/baseline/mode')
  check_eq(Lines[1].y, Margin_top+Drawing_padding_top, 'F - test_draw_rectangle_intermediate/baseline/y')
  check_eq(Lines[1].h, 128, 'F - test_draw_rectangle_intermediate/baseline/y')
  check_eq(#Lines[1].shapes, 0, 'F - test_draw_rectangle_intermediate/baseline/#shapes')
  -- first point
  App.run_after_mouse_press(Margin_left+35, Margin_top+Drawing_padding_top+36, 1)
  App.run_after_keychord('r')  -- rectangle mode
  -- second point/first edge
  App.mouse_move(Margin_left+42, Margin_top+Drawing_padding_top+45)
  App.run_after_keychord('p')
  -- override second point/first edge
  App.mouse_move(Margin_left+75, Margin_top+Drawing_padding_top+76)
  App.run_after_keychord('p')
  local drawing = Lines[1]
  check_eq(#drawing.points, 3, 'F - test_draw_rectangle_intermediate/#points')  -- currently includes every point added
  local pending = drawing.pending
  check_eq(pending.mode, 'rectangle', 'F - test_draw_rectangle_intermediate/shape_mode')
  check_eq(#pending.vertices, 2, 'F - test_draw_rectangle_intermediate/vertices')
  local p = drawing.points[pending.vertices[1]]
  check_eq(p.x, 35, 'F - test_draw_rectangle_intermediate/p1:x')
  check_eq(p.y, 36, 'F - test_draw_rectangle_intermediate/p1:y')
  local p = drawing.points[pending.vertices[2]]
  check_eq(p.x, 75, 'F - test_draw_rectangle_intermediate/p2:x')
  check_eq(p.y, 76, 'F - test_draw_rectangle_intermediate/p2:y')
  -- outline of rectangle is drawn based on where the mouse is, but we can't check that so far
end
function test_draw_square()
  io.write('\ntest_draw_square')
  -- display a drawing followed by a line of text (you shouldn't ever have a drawing right at the end)
  App.screen.init{width=Margin_left+300, height=300}
  Lines = load_array{'```lines', '```', ''}
  Line_width = 256  -- drawing coordinates 1:1 with pixels
  App.draw()
  check_eq(Current_drawing_mode, 'line', 'F - test_draw_square/baseline/drawing_mode')
  check_eq(#Lines, 2, 'F - test_draw_square/baseline/#lines')
  check_eq(Lines[1].mode, 'drawing', 'F - test_draw_square/baseline/mode')
  check_eq(Lines[1].y, Margin_top+Drawing_padding_top, 'F - test_draw_square/baseline/y')
  check_eq(Lines[1].h, 128, 'F - test_draw_square/baseline/y')
  check_eq(#Lines[1].shapes, 0, 'F - test_draw_square/baseline/#shapes')
  -- first point
  App.run_after_mouse_press(Margin_left+35, Margin_top+Drawing_padding_top+36, 1)
  App.run_after_keychord('s')  -- square mode
  -- second point/first edge
  App.mouse_move(Margin_left+42, Margin_top+Drawing_padding_top+45)
  App.run_after_keychord('p')
  -- override second point/first edge
  App.mouse_move(Margin_left+65, Margin_top+Drawing_padding_top+66)
  App.run_after_keychord('p')
  -- release (decides which side of first edge to draw square on)
  App.run_after_mouse_release(Margin_left+15, Margin_top+Drawing_padding_top+26, 1)
  local drawing = Lines[1]
  check_eq(#drawing.shapes, 1, 'F - test_draw_square/#shapes')
  check_eq(#drawing.points, 5, 'F - test_draw_square/#points')  -- currently includes every point added
  check_eq(drawing.shapes[1].mode, 'square', 'F - test_draw_square/shape_mode')
  check_eq(#drawing.shapes[1].vertices, 4, 'F - test_draw_square/vertices')
  local p = drawing.points[drawing.shapes[1].vertices[1]]
  check_eq(p.x, 35, 'F - test_draw_square/p1:x')
  check_eq(p.y, 36, 'F - test_draw_square/p1:y')
  local p = drawing.points[drawing.shapes[1].vertices[2]]
  check_eq(p.x, 65, 'F - test_draw_square/p2:x')
  check_eq(p.y, 66, 'F - test_draw_square/p2:y')
  local p = drawing.points[drawing.shapes[1].vertices[3]]
  check_eq(p.x, 35, 'F - test_draw_square/p3:x')
  check_eq(p.y, 96, 'F - test_draw_square/p3:y')
  local p = drawing.points[drawing.shapes[1].vertices[4]]
  check_eq(p.x, 5, 'F - test_draw_square/p4:x')
  check_eq(p.y, 66, 'F - test_draw_square/p4:y')
end

  elseif App.mouse_down(1) and chord == 'p' and (Current_drawing_mode == 'polygon' or Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square') then

  elseif App.mouse_down(1) and chord == 'p' and Current_drawing_mode == 'polygon' then
    local _,drawing = Drawing.current_drawing()
    local mx,my = Drawing.coord(App.mouse_x()-Margin_left), Drawing.coord(App.mouse_y()-drawing.y)
    local j = Drawing.insert_point(drawing.points, mx,my)
    table.insert(drawing.pending.vertices, j)
  elseif App.mouse_down(1) and chord == 'p' and (Current_drawing_mode == 'rectangle' or Current_drawing_mode == 'square') then

    while #drawing.pending.vertices >= 2 do
      table.remove(drawing.pending.vertices)
    end