Le langage Basic est d’un apprentissage aisé ce qui en fait une porte d’entrée à l’informaticien en herbe désireux de s’initier à la programmation.

Il existe plusieurs environnements de développement Basic, comme Free Basic ou Small BASIC (Microsoft), tous deux disponibles en libre téléchargement.

Des exemples de codes sources s’inspirant de programmes de jeu emblématiques des années 80 écrits en Small Basic sont librement téléchargeables sur le site www.nonkit.com : Donkey Kong, Snake, jeu de GO, Tic Tac Toe… L’analyse de ces listings est une source précieuse facilitant l’apprentissage de la programmation.

Exemple avec DONKEY KONG :

' DONKEY KONG in the Small Basic World 0.91
' Small Basic version written by Nonki Takahashi.
'
' History:
' 0.91 2014-05-18 Added workaround for Silverlight. (FGM769-8)
' 0.8 2014-03-24 Added ladders. (FGM769-6)
' 0.7 2014-03-24 Changed music. (FGM769-5)
' 0.6 2014-03-24 Added music and ending. (FGM769-4)
' 0.5b 2014-03-14 Added motion of Mario. (FGM769-3)
' 0.4a 2014-03-13 Added Donkey Kong. (FGM769-2)
' 2014-03-13 13:40:50 Donkey Kong generated by Shapes 1.6b.
' 0.3a 2014-03-12 Barrels demo with friction. (FGM769-1)
' 0.2a 2014-03-10 Barrel demo without friction. (FGM769-0)
' 0.1a 2014-03-08 Created only for graphics. (FGM769)
'
GraphicsWindow.Title = "DONKEY KONG in the Small Basic World 0.91"
MAXBARREL = 8
Init()
Opening()
g = 9.8     ' [m/s^2]
dt = 1 / 24 ' [s]
pxpm = 50   ' [pixel/m]
pslope[1] = "x1=200;y1=70;x2=400;y2=70;height=16;pitch=10;color=Maroon;"
pslope[2] = "x1=0;y1=130;x2=540;y2=150;height=16;pitch=10;color=Maroon;"
pslope[3] = "x1=60;y1=240;x2=600;y2=220;height=16;pitch=10;color=Maroon;"
pslope[4] = "x1=0;y1=310;x2=540;y2=330;height=16;pitch=10;color=Maroon;"
pslope[5] = "x1=300;y1=412;x2=600;y2=400;height=16;pitch=10;color=Maroon;"
pslope[6] = "x1=0;y1=412;x2=300;y2=412;height=16;pitch=10;color=Maroon;"
ns = Array.GetItemCount(pslope)
For i = 1 To ns
  param = pslope[i]
  Slope_Add()
EndFor
pladder[1] = "x=360;y=86;width=20;height=56;pitch=8;color=DarkCyan;"
pladder[2] = "x=500;y=166;width=20;height=56;pitch=8;color=DarkCyan;"
pladder[3] = "x=80;y=256;width=20;height=56;pitch=8;color=DarkCyan;"
pladder[4] = "x=500;y=346;width=20;height=56;pitch=8;color=DarkCyan;"
nl = Array.GetItemCount(pladder)
For i = 1 To nl
  param = pladder[i]
  Ladder_Add()
EndFor
op = 100
For i = 1 To 10
  hx = hx + 2
  op = op - 10
  Shapes.Move(help, hx, hy)
  Shapes.SetOpacity(help, op)
  Program.Delay(200)
EndFor
param = "x=10;y=40;m=5000;e=0.56;mu=1;"
Barrel_Add()
lastms = Clock.ElapsedMilliseconds
timeout = "False"
Timer.Interval = dt * 1000
Timer.Tick = OnTick
Sound.PlayMusic("O6C4D8F8R8D8C8D8O5B-8O6C16D16E-16F16G16A16B-2")
GraphicsWindow.KeyDown = OnKeyDown
inGame = "True"
goal = "False"
While inGame
  If timeout Then
    ms = Clock.ElapsedMilliseconds
    If 5000 < ms - lastms Then
      param = "x=10;y=40;m=5000;e=0.56;mu=1;"
      Barrel_Add()
      lastms = ms
      If mario["ob"] Then
        Mario_Add()
      EndIf
    EndIf
    Barrel_Motion()
    Mario_Motion()
    timeout = "False"
  Else
    Program.Delay(dt * 1000)
  EndIf
  If goal Then
    Ending()
  EndIf
EndWhile
Closing()
Sub Ending
  Shapes.ShowShape(heart)
  Sound.PlayMusic("O6R4D4D-8D8R8G8R4G4F8D8R4C4C4F8D-8D8R8O5B-2")
  inGame = "False"
  Program.Delay(3000)
EndSub
Sub Closing
  GraphicsWindow.Clear()
  fs = 40
  GraphicsWindow.FontSize = fs
  GraphicsWindow.BrushColor = "White"
  tw = 267
  x = Math.Floor((gw - tw) / 2)
  y = Math.Floor((gh - fs) / 2)
  GraphicsWindow.DrawText(x, y, "GAME OVER")
EndSub
Sub Init
  gw = 598
  gh = 428
  GraphicsWindow.Width = gw
  GraphicsWindow.Height = gh
  GraphicsWindow.BackgroundColor = "Black"
  Not = "True=False;False=True;"
EndSub
Sub OnKeyDown
  key = GraphicsWindow.LastKey
  If mario["landing"] Then
    If key = "Left" Then
      mario["vx"] = mario["vx"] - 100
      mario["vy"] = mario["vy"] - 100
    ElseIf key = "Right" Then
      mario["vx"] = mario["vx"] + 100
      mario["vy"] = mario["vy"] - 100
    ElseIf key = "Up" Then
      mario["vy"] = mario["vy"] - 160
    EndIf
  EndIf
EndSub
Sub OnTick
  timeout = "True"
EndSub
Sub Opening
  ' initialize shapes
  SB_Workaround()
  GraphicsWindow.BrushColor = "White"
  GraphicsWindow.FontName = "Arial Black"
  GraphicsWindow.FontSize = 40
  title = Shapes.AddText("DONKEY KONG")
  tw = 336
  x = (gw - tw) / 2
  Shapes.Move(title, x, 20)
  GraphicsWindow.FontSize = 20
  subtitle = Shapes.AddText("in the Small Basic World")
  tw = 267
  x = (gw - tw) / 2
  Shapes.Move(subtitle, x, 80)
  Shapes_Init()
  ' add shapes
  scale = 1
  angle = 0
  iMin = 1
  iMax = 47
  Shapes_Add()
  Sound.PlayMusic("O3B2O4R4C#4D2O3B2O4F#16F16F#16F16F#16F16F#16F16F#16F16F#16F16F#16F16F#16F16F#1")
  Shapes.Remove(title)
  Shapes.Remove(subtitle)
  Shapes_Remove()
  url = "http://www.nonkit.com/smallbasic.files/"
  peach = Shapes.AddImage(url + "Peach96.png")
  If silverlight Then
    Program.Delay(msWait)
  EndIf
  Shapes.Move(peach, 180, -4)
  Shapes.Zoom(peach, 0.6, 0.6)
  GraphicsWindow.BrushColor = "White"
  GraphicsWindow.FontSize = 12
  help = Shapes.AddText("HELP!")
  hx = 260
  hy = 20
  Shapes.Move(help, hx, hy)
  ' add shapes
  scale = 0.3
  angle = 0
  iMin = 1
  iMax = 47
  Shapes_Add()
  x = 20
  y = 48
  Shapes_Move()
  GraphicsWindow.PenWidth = 2
  Mario_Add()
  GraphicsWindow.FontSize = 50
  GraphicsWindow.BrushColor = "Magenta"
  heart = Shapes.AddText("♥")
  Shapes.Move(heart, 260, 0)
  Shapes.HideShape(heart)
EndSub
Sub Barrel_Add
  ' param["x"] - left co-ordinate
  ' param["y"] - top co-ordinate
  ' param["m"] - mass of barrel [g]
  ' param["e"] - coefficient of resititution
  ' param["mu"] - cofficient of friction
  n = barrel["num"]
  n = n + 1
  If MAXBARREL < n Then
    Barrel_FindUsed()
  Else
    barrel["num"] = n
  EndIf
  barrel[n]["m"] = param["m"]
  barrel[n]["e"] = param["e"]
  barrel[n]["mu"] = param["mu"]
  url = "http://www.nonkit.com/smallbasic.files/Barrel32.png"
  x = param["x"]
  y = param["y"]
  If barrel[n]["obj"] = "" Then
    barrel[n]["obj"] = Shapes.AddImage(url)
    If silverlight Then
      Program.Delay(msWait)
    EndIf
  EndIf
  Shapes.SetOpacity(barrel[n]["obj"], 100)
  barrel[n]["x"] = x
  barrel[n]["y"] = y
  Shapes.Move(barrel[n]["obj"], x, y)
  barrel[n]["vx"] = 0
  barrel[n]["vy"] = 0
  barrel[n]["vr"] = 0 ' rotational velocity
  barrel[n]["r"] = 0  ' rotation angle
EndSub
Sub Barrel_FindUsed
  ' return n - index of barrel used
  For n = 1 To barrel["num"]
    If barrel[n]["x"] < -32 Then
      Goto bfu_found
    EndIf
  EndFor
  bfu_found:
EndSub
Sub Barrel_Motion
  nb = barrel["num"]
  ns = slope["num"]
  ax = 0
  ay = g * pxpm
  For ib = 1 To nb
    vx = barrel[ib]["vx"]
    vy = barrel[ib]["vy"]
    barrel[ib]["vx"] = vx + ax * dt
    barrel[ib]["vy"] = vy + ay * dt
    barrel[ib]["x"] = barrel[ib]["x"] + (vx + barrel[ib]["vx"]) * dt / 2
    barrel[ib]["y"] = barrel[ib]["y"] + (vy + barrel[ib]["vy"]) * dt / 2
    xo = barrel[ib]["x"] + 16
    yo = barrel[ib]["y"] + 16
    e = barrel[ib]["e"]
    m = barrel[ib]["m"]
    mu = barrel[ib]["mu"]
    For is = 1 To ns
      a = slope[is]["a"]
      b = slope[is]["b"]
      c = slope[is]["c"]
      d = Math.Abs(a * xo + b * yo + c) / Math.SquareRoot(a * a + b * b)
      If d <= 16 And slope[is]["x1"] <= xo And xo <= slope[is]["x2"] Then
        x = barrel[ib]["vx"]
        y = barrel[ib]["vy"]
        Math_CartesianToPolar()
        ss = slope[is]["ss"]
        a = ss * 2 - a
        vx = r * Math.Cos(Math.GetRadians(a))
        vy = r * Math.Sin(Math.GetRadians(a))
        dv = Math.SquareRoot(Math.Power((vx - x), 2) + Math.Power((vy - y), 2))
        a = g * Math.Sin(Math.GetRadians(ss)) * pxpm / 2
        If barrel[ib]["vr"] * a < 0 Then
          barrel[ib]["vr"] = -0.3 * barrel[ib]["vr"]
        EndIf
        barrel[ib]["vr"] = barrel[ib]["vr"] + a * dt
        dvx = barrel[ib]["vr"] * 16 * Math.Cos(Math.GetRadians(ss))
        dvy = barrel[ib]["vr"] * 16 * Math.Sin(Math.GetRadians(ss))
        barrel[ib]["vx"] = (vx - x) * e / 2 + (vx + x) / 2
        barrel[ib]["vy"] = (vy - y) * e / 2 + (vy + y) / 2
        barrel[ib]["x"] = barrel[ib]["x"] + (vx - x) * (16 - d) / dv * e * e
        barrel[ib]["y"] = barrel[ib]["y"] + (vy - y) * (16 - d) / dv * e * e
      EndIf
    EndFor
    barrel[ib]["r"] = barrel[ib]["r"] + barrel[ib]["vr"] * dt
    Shapes.Rotate(barrel[ib]["obj"], barrel[ib]["r"] * 10)
    l = barrel[ib]["x"]
    If l < 0 And barrel[ib]["y"] < 290 Then
      barrel[ib]["x"] = -l * e * e
      barrel[ib]["vx"] = -barrel[ib]["vx"] * e
    EndIf
    r = barrel[ib]["x"] + 32
    If gw < r Then
      barrel[ib]["x"] = barrel[ib]["x"] - 2 * (r - gw) * e * e
      barrel[ib]["vx"] = -barrel[ib]["vx"] * e
    EndIf
    h = gh - (barrel[ib]["y"] + 32)
    If h < 0 Then
      barrel[ib]["y"] = barrel[ib]["y"] + h * e * e
      barrel[ib]["vy"] = -barrel[ib]["vy"] * e
    EndIf
    Shapes.Move(barrel[ib]["obj"], barrel[ib]["x"], barrel[ib]["y"])
  EndFor
EndSub
Sub Ladder_Add
  ' param["x"] - top-left x co-ordinate
  ' param["y"] - top-left y co-ordinate
  ' param["width"] - width of ladder
  ' param["height"] - height of ladder
  ' param["pitch"] - y pitch for steps
  ' param["color"] - color of slop
  ' return slope
  GraphicsWindow.PenColor = param["color"]
  x = param["x"]
  y = param["y"]
  width = param["width"]
  height = param["height"]
  pitch = param["pitch"]
  GraphicsWindow.DrawLine(x, y, x, y + height)
  GraphicsWindow.DrawLine(x + width, y, x + width, y + height)
  For ys = y + pitch / 2  To y + height - pitch / 2 Step pitch
    GraphicsWindow.DrawLine(x, ys, x + width, ys)
  EndFor
EndSub
Sub Mario_Add
  x = 10
  y = gh - 20 - 48
  If mario["obj1"] = "" Then
    mario["n"] = 3
    url = "http://www.nonkit.com/smallbasic.files/"
    For i = 1 To mario["n"]
      life[i] = Shapes.AddImage(url + "Mario48.png")
     If silverlight Then
      Program.Delay(msWait)
    EndIf
     Shapes.Move(life[i], gw + (i - 5) * 24, 10)
      Shapes.Zoom(life[i], 0.5, 0.5)
    EndFor
    mario["obj1"] = Shapes.AddImage(url + "Mario48.png")
    If silverlight Then
      Program.Delay(msWait)
    EndIf
    Shapes.Move(mario["obj1"], x, y)
    mario["obj2"] = Shapes.AddImage(url + "Mario48L.png")
    mario["obj3"] = Shapes.AddImage(url + "MarioJump48.png")
    mario["obj4"] = Shapes.AddImage(url + "MarioJump48L.png")
    If silverlight Then
      Program.Delay(msWait)
    EndIf
    For i = 1 To 4
      Shapes.HideShape(mario["obj" + i])
    EndFor
    Program.Delay(1000)
    Shapes.ShowShape(mario["obj1"])
    Shapes.HideShape(life[mario["n"]])
    mario["n"] = mario["n"] - 1
  ElseIf 0 < mario["n"] Then
    Shapes.HideShape(life[mario["n"]])
    mario["n"] = mario["n"] - 1
    Shapes.Move(mario["obj1"], x, y)
    Shapes.Rotate(mario["obj1"], 0)
    Shapes.ShowShape(mario["obj1"])
  Else
    inGame = "False"
  EndIf
  mario["x"] = x
  mario["y"] = y
  mario["vx"] = 1
  mario["vy"] = 0
  mario["r"] = 0
  mario["vr"] = 0
  mario["lastobj"] = 1
  mario["hit"] = "False"
  mario["right"] = "True"
  mario["ob"] = "False"
EndSub
Sub Mario_Motion
  ax = 0
  ay = g * pxpm
  vx = mario["vx"]
  vy = mario["vy"]
  mario["vx"] = vx + ax * dt
  mario["vy"] = vy + ay * dt
  xm = mario["x"] + (vx + mario["vx"]) * dt / 2 + 24
  ym = mario["y"] + (vy + mario["vy"]) * dt / 2 + 24
  mario["landing"] = "False"
  If Not[mario["hit"]] Then
    nb = barrel["num"]
    For ib = 1 To nb
      xb = barrel[ib]["x"] + 16
      yb = barrel[ib]["y"] + 16
      d = Math.SquareRoot(Math.Power((xb - xm), 2) + Math.Power((yb - ym), 2))
      If d < 20 Then
        mario["hit"] = "True"
        mario["vx"] = 0
        ym = ym - 24
        mario["vr"] = 720
      EndIf
    EndFor
    ns = slope["num"]
    For is = 1 To ns
      a = slope[is]["a"]
      b = slope[is]["b"]
      c = slope[is]["c"]
      d = Math.Abs(a * xm + b * ym + c) / Math.SquareRoot(a * a + b * b)
      If d <= 24 And slope[is]["x1"] <= xm And xm <= slope[is]["x2"] Then
        mario["landing"] = "True"
        mario["vx"] = 0
        mario["vy"] = 0
        ym = -(a * xm + c) / b - 22
        Goto mm_break
      EndIf
    EndFor
    mm_break:
  EndIf
  mario["x"] = xm - 24
  mario["y"] = Math.Floor(ym - 24)
  l = mario["x"]
  If mario["landing"] And is = 1 Then
    goal = "True"
  EndIf
  If l < 0 Then
    mario["x"] = -l * e * e
    mario["vx"] = -mario["vx"] * e
  EndIf
  r = mario["x"] + 48
  If gw < r Then
    mario["x"] = mario["x"] - 2 * (r - gw) * e * e
    mario["vx"] = -mario["vx"] * e
  EndIf
  h = gh - (mario["y"] + 48)
  If mario["hit"] Then
    If h < -48 Then
      mario["ob"] = "True"
    EndIf
  Else
    If h < 0 Then
      mario["y"] = mario["y"] + h * e * e
      mario["vy"] = -mario["vy"] * e
    EndIf
  EndIf
  If mario["landing"] Then
    If 0 < mario["vx"] Then
      im = 1
    ElseIf mario["vx"] < 0 Then
      im = 2
    Else
      im = Math.Remainder(im - 1, 2) + 1
    EndIf
  Else
    If 0 < mario["vx"] Then
      im = 3
    ElseIf mario["vx"] < 0 Then
      im = 4
    Else
      im = Math.Remainder(im - 1, 2) + 3
    EndIf
  EndIf
  If mario["lastobj"] <> im Then
    Shapes.HideShape(mario["obj" + mario["lastobj"]])
    Shapes.ShowShape(mario["obj" + im])
    mario["lastobj"] = im
  EndIf
  mario["r"] = mario["r"] + mario["vr"] * dt
  Shapes.Rotate(mario["obj" + im], mario["r"])
  Shapes.Move(mario["obj" + im], mario["x"], mario["y"])
EndSub
Sub Math_CartesianToPolar
  ' Math | convert cartesian coodinate to polar coordinate
  ' param x, y - cartesian coordinate
  ' return r, a - polar coordinate
  r = Math.SquareRoot(x * x + y * y)
  If x = 0 And y > 0 Then
    a = 90 ' [degree]
  ElseIf x = 0 And y < 0 Then
    a = -90
  Else
    a = Math.ArcTan(y / x) * 180 / Math.Pi
  EndIf
  If x < 0 Then
    a = a + 180
  ElseIf x > 0 And y < 0 Then
    a = a + 360
  EndIf
EndSub
Sub SB_RotateWorkaround
  ' Small Basic | Rotate workaround for Silverlight
  ' param x, y - original coordinate
  ' param alpha - angle [radian]
  ' returns x, y - workaround coordinate
  If shape[i]["func"] = "tri" Then
    x1 = -Math.Floor(shape[i]["x3"] / 2)
    y1 = -Math.Floor(shape[i]["y3"] / 2)
  ElseIf shape[i]["func"] = "line" Then
    x1 = -Math.Floor(Math.Abs(shape[i]["x1"] - shape[i]["x2"]) / 2)
    y1 = -Math.Floor(Math.Abs(shape[i]["y1"] - shape[i]["y2"]) / 2)
  EndIf
  ox = x - x1
  oy = y - y1
  x = x1 * Math.Cos(alpha) - y1 * Math.Sin(alpha) + ox
  y = x1 * Math.Sin(alpha) + y1 * Math.Cos(alpha) + oy
EndSub
Sub SB_Workaround
  ' Small Basic | Workaround for Silverlight
  ' returns silverlight - "True" if in remote
  color = GraphicsWindow.GetPixel(0, 0)
  If Text.GetLength(color) > 7 Then
    silverlight = "True"
    msWait = 300
  Else
    silverlight = "False"
  EndIf
EndSub
Sub Shapes_Add
  ' Shapes | add shapes as shapes data
  ' param iMin, iMax - shape indices to add
  ' param shape - array of shapes
  ' param scale - 1 if same scale
  ' return shWidth, shHeight - total size of shapes
  ' return shAngle - current angle of shapes
  Stack.PushValue("local", i)
  Stack.PushValue("local", x)
  Stack.PushValue("local", y)
  Shapes_CalcWidthAndHeight()
  s = scale
  For i = iMin To iMax
    GraphicsWindow.PenWidth = shape[i]["pw"] * s
    If shape[i]["pw"] > 0 Then
      GraphicsWindow.PenColor = shape[i]["pc"]
    EndIf
    If Text.IsSubText("rect|ell|tri|text", shape[i]["func"]) Then
      GraphicsWindow.BrushColor = shape[i]["bc"]
    EndIf
    If shape[i]["func"] = "rect" Then
      shape[i]["obj"] = Shapes.AddRectangle(shape[i]["width"] * s, shape[i]["height"] * s)
    ElseIf shape[i]["func"] = "ell" Then
      shape[i]["obj"] = Shapes.AddEllipse(shape[i]["width"] * s, shape[i]["height"] * s)
    ElseIf shape[i]["func"] = "tri" Then
      shape[i]["obj"] = Shapes.AddTriangle(shape[i]["x1"] * s, shape[i]["y1"] * s, shape[i]["x2"] * s, shape[i]["y2"] * s, shape[i]["x3"] * s, shape[i]["y3"] * s)
    ElseIf shape[i]["func"] = "line" Then
      shape[i]["obj"] = Shapes.AddLine(shape[i]["x1"] * s, shape[i]["y1"] * s, shape[i]["x2"] * s, shape[i]["y2"] * s)
    ElseIf shape[i]["func"] = "text" Then
      If silverlight Then
        fs = Math.Floor(shape[i]["fs"] * 0.9)
      Else
        fs = shape[i]["fs"]
      EndIf
      GraphicsWindow.FontSize = fs * s
      GraphicsWindow.FontName = shape[i]["fn"]
      shape[i]["obj"] = Shapes.AddText(shape[i]["text"])
    EndIf
    x = shape[i]["x"]
    y = shape[i]["y"]
    shape[i]["rx"] = x
    shape[i]["ry"] = y
    If silverlight And Text.IsSubText("tri|line", shape[i]["func"]) Then
      alpha = Math.GetRadians(shape[i]["angle"])
      SB_RotateWorkaround()
      shape[i]["wx"] = x
      shape[i]["wy"] = y
    EndIf
    Shapes.Move(shape[i]["obj"], shX + x * s, shY + y * s)
    If Text.IsSubText("rect|ell|tri|text", shape[i]["func"]) And shape[i]["angle"] <> 0 Then
      Shapes.Rotate(shape[i]["obj"], shape[i]["angle"])
    EndIf
  EndFor
  shAngle = 0
  y = Stack.PopValue("local")
  x = Stack.PopValue("local")
  i = Stack.PopValue("local")
EndSub
Sub Shapes_CalcRotatePos
  ' Shapes | Calculate position for rotated shape
  ' param["x"], param["y"] - position of a shape
  ' param["width"], param["height"] - size of a shape
  ' param ["cx"], param["cy"] - center of rotation
  ' param ["angle"] - rotate angle
  ' return x, y - rotated position of a shape
  _cx = param["x"] + param["width"] / 2
  _cy = param["y"] + param["height"] / 2
  x = _cx - param["cx"]
  y = _cy - param["cy"]
  Math_CartesianToPolar()
  a = a + param["angle"]
  x = r * Math.Cos(a * Math.Pi / 180)
  y = r * Math.Sin(a * Math.Pi / 180)
  _cx = x + param["cx"]
  _cy = y + param["cy"]
  x = _cx - param["width"] / 2
  y = _cy - param["height"] / 2
EndSub
Sub Shapes_CalcWidthAndHeight
  ' Shapes | Calculate total width and height of shapes
  ' param iMin, iMax - shape indices to add
  ' return shWidth, shHeight - total size of shapes
  For i = iMin To iMax
    If shape[i]["func"] = "tri" Or shape[i]["func"] = "line" Then
      xmin = shape[i]["x1"]
      xmax = shape[i]["x1"]
      ymin = shape[i]["y1"]
      ymax = shape[i]["y1"]
      If shape[i]["x2"] < xmin Then
        xmin = shape[i]["x2"]
      EndIf
      If xmax < shape[i]["x2"] Then
        xmax = shape[i]["x2"]
      EndIf
      If shape[i]["y2"] < ymin Then
        ymin = shape[i]["y2"]
      EndIf
      If ymax < shape[i]["y2"] Then
        ymax = shape[i]["y2"]
      EndIf
      If shape[i]["func"] = "tri" Then
        If shape[i]["x3"] < xmin Then
          xmin = shape[i]["x3"]
        EndIf
        If xmax < shape[i]["x3"] Then
          xmax = shape[i]["x3"]
        EndIf
        If shape[i]["y3"] < ymin Then
          ymin = shape[i]["y3"]
        EndIf
        If ymax < shape[i]["y3"] Then
          ymax = shape[i]["y3"]
        EndIf
      EndIf
      shape[i]["width"] = xmax - xmin
      shape[i]["height"] = ymax - ymin
    EndIf
    If i = 1 Then
      shWidth = shape[i]["x"] + shape[i]["width"]
      shHeight = shape[i]["y"] + shape[i]["height"]
    Else
      If shWidth < shape[i]["x"] + shape[i]["width"] Then
        shWidth = shape[i]["x"] + shape[i]["width"]
      EndIf
      If shHeight < shape[i]["y"] + shape[i]["height"] Then
        shHeight = shape[i]["y"] + shape[i]["height"]
      EndIf
    EndIf
  EndFor
EndSub
Sub Shapes_Init
  ' Shapes | Initialize shapes data for Donkey Kong
  ' return shX, shY - current position of shapes
  ' return shape - array of shapes
  shX = 150 ' x offset
  shY = 120 ' y offset
  shape = ""
  shape[1] = "func=ell;x=98;y=44;width=110;height=71;bc=#834216;pw=0;"
  shape[2] = "func=ell;x=51;y=247;width=75;height=23;angle=348;bc=#FDBC90;pc=#834216;pw=2;"
  shape[3] = "func=ell;x=197;y=250;width=74;height=22;angle=11;bc=#FDBC90;pc=#834216;pw=2;"
  shape[4] = "func=ell;x=113;y=253;width=20;height=22;bc=#FDBC90;pc=#834216;pw=2;"
  shape[5] = "func=ell;x=191;y=255;width=18;height=20;bc=#FDBC90;pc=#834216;pw=2;"
  shape[6] = "func=ell;x=40;y=260;width=13;height=16;bc=#FDBC90;pc=#834216;pw=2;"
  shape[7] = "func=ell;x=47;y=264;width=16;height=18;bc=#FDBC90;pc=#834216;pw=2;"
  shape[8] = "func=ell;x=261;y=267;width=13;height=13;bc=#FDBC90;pc=#834216;pw=2;"
  shape[9] = "func=ell;x=252;y=269;width=13;height=15;bc=#FDBC90;pc=#834216;pw=2;"
  shape[10] = "func=ell;x=81;y=190;width=36;height=67;angle=332;bc=#834216;pw=0;"
  shape[11] = "func=ell;x=200;y=188;width=35;height=67;angle=20;bc=#834216;pw=0;"
  shape[12] = "func=ell;x=76;y=175;width=62;height=43;bc=#834216;pw=0;"
  shape[13] = "func=ell;x=171;y=178;width=60;height=40;bc=#834216;pw=0;"
  shape[14] = "func=ell;x=112;y=139;width=82;height=76;bc=#834216;pw=0;"
  shape[15] = "func=ell;x=75;y=99;width=81;height=72;bc=#834216;pw=0;"
  shape[16] = "func=ell;x=149;y=96;width=82;height=74;bc=#834216;pw=0;"
  shape[17] = "func=ell;x=5;y=87;width=107;height=55;angle=340;bc=#834216;pw=0;"
  shape[18] = "func=ell;x=195;y=82;width=109;height=59;angle=25;bc=#834216;pw=0;"
  shape[19] = "func=ell;x=0;y=126;width=43;height=76;angle=341;bc=#834216;pw=0;"
  shape[20] = "func=ell;x=263;y=126;width=45;height=72;angle=17;bc=#834216;pw=0;"
  shape[21] = "func=ell;x=33;y=176;width=39;height=35;bc=#FDBC90;pc=#834216;pw=2;"
  shape[22] = "func=ell;x=239;y=176;width=41;height=37;bc=#FDBC90;pc=#834216;pw=2;"
  shape[23] = "func=tri;x=113;y=0;x1=37;y1=0;x2=0;y2=76;x3=75;y3=76;bc=#834216;pw=0;"
  shape[24] = "func=tri;x=148;y=5;x1=15;y1=0;x2=0;y2=43;x3=31;y3=43;bc=#834216;pw=0;"
  shape[25] = "func=ell;x=110;y=46;width=58;height=41;angle=33;bc=#FDBC90;pw=0;"
  shape[26] = "func=ell;x=138;y=47;width=61;height=41;angle=318;bc=#FDBC90;pw=0;"
  shape[27] = "func=tri;x=119;y=60;x1=33;y1=0;x2=0;y2=41;x3=67;y3=41;angle=180;bc=#000000;pc=#000000;pw=2;"
  shape[28] = "func=ell;x=127;y=61;width=28;height=19;angle=349;bc=#FFFFFF;pc=#000000;pw=2;"
  shape[29] = "func=ell;x=152;y=62;width=30;height=20;angle=16;bc=#FFFFFF;pc=#000000;pw=2;"
  shape[30] = "func=ell;x=135;y=66;width=14;height=15;bc=#000000;pc=#000000;pw=2;"
  shape[31] = "func=ell;x=158;y=67;width=14;height=15;bc=#000000;pc=#000000;pw=2;"
  shape[32] = "func=ell;x=123;y=140;width=59;height=60;bc=#FCA76E;pc=#834216;pw=2;"
  shape[33] = "func=ell;x=150;y=107;width=62;height=55;bc=#FCA76E;pw=0;"
  shape[34] = "func=ell;x=94;y=107;width=64;height=53;bc=#FCA76E;pw=0;"
  shape[35] = "func=ell;x=96;y=79;width=118;height=69;bc=#FDBC90;pc=#834216;pw=2;"
  shape[36] = "func=ell;x=77;y=65;width=35;height=23;angle=38;bc=#FDBC90;pc=#834216;pw=2;"
  shape[37] = "func=ell;x=194;y=63;width=36;height=23;angle=317;bc=#FDBC90;pc=#834216;pw=2;"
  shape[38] = "func=ell;x=130;y=74;width=22;height=17;angle=15;bc=#FDBC90;pw=0;"
  shape[39] = "func=ell;x=156;y=73;width=22;height=18;angle=348;bc=#FDBC90;pw=0;"
  shape[40] = "func=tri;x=111;y=90;x1=10;y1=0;x2=0;y2=22;x3=20;y3=22;angle=298;bc=#FFFFFF;pc=#000000;pw=2;"
  shape[41] = "func=tri;x=172;y=91;x1=11;y1=0;x2=0;y2=23;x3=22;y3=23;angle=62;bc=#FFFFFF;pc=#000000;pw=2;"
  shape[42] = "func=rect;x=125;y=97;width=55;height=21;bc=#FFFFFF;pc=#000000;pw=2;"
  shape[43] = "func=ell;x=135;y=78;width=15;height=9;angle=23;bc=#834216;pw=0;"
  shape[44] = "func=ell;x=159;y=77;width=15;height=9;angle=339;bc=#834216;pw=0;"
  shape[45] = "func=line;x=152;y=97;x1=0;y1=0;x2=0;y2=19;pc=#000000;pw=2;"
  shape[46] = "func=line;x=137;y=98;x1=0;y1=0;x2=0;y2=19;pc=#000000;pw=2;"
  shape[47] = "func=line;x=167;y=99;x1=0;y1=0;x2=0;y2=18;pc=#000000;pw=2;"
EndSub
Sub Shapes_Move
  ' Shapes | Move shapes
  ' param iMin, iMax - shape indices to add
  ' param shape - array of shapes
  ' param scale - to zoom
  ' param x, y - position to move
  ' return shX, shY - new position of shapes
  Stack.PushValue("local", i)
  s = scale
  shX = x
  shY = y
  For i = iMin To iMax
    If silverlight And Text.IsSubText("tri|line", shape[i]["func"]) Then
      _x = shape[i]["wx"]
      _y = shape[i]["wy"]
    Else
      _x = shape[i]["rx"]
      _y = shape[i]["ry"]
    EndIf
    Shapes.Move(shape[i]["obj"], shX + _x * s, shY + _y * s)
  EndFor
  i = Stack.PopValue("local")
EndSub
Sub Shapes_Remove
  ' Shapes | Remove shapes
  ' param iMin, iMax - shapes indices to remove
  ' param shape - array of shapes
  Stack.PushValue("local", i)
  For i = iMin To iMax
    Shapes.Remove(shape[i]["obj"])
  EndFor
  i = Stack.PopValue("local")
EndSub
Sub Shapes_Rotate
  ' Shapes | Rotate shapes
  ' param iMin, iMax - shapes indices to rotate
  ' param shape - array of shapes
  ' param scale - to zoom
  ' param angle - to rotate
  Stack.PushValue("local", i)
  Stack.PushValue("local", x)
  Stack.PushValue("local", y)
  s = scale
  param["angle"] = angle
  param["cx"] = shWidth / 2
  param["cy"] = shHeight / 2
  For i = iMin To iMax
    param["x"] = shape[i]["x"]
    param["y"] = shape[i]["y"]
    param["width"] = shape[i]["width"]
    param["height"] = shape[i]["height"]
    Shapes_CalcRotatePos()
    shape[i]["rx"] = x
    shape[i]["ry"] = y
    If silverlight And Text.IsSubText("tri|line", shape[i]["func"]) Then
      alpha = Math.GetRadians(angle + shape[i]["angle"])
      SB_RotateWorkAround()
      shape[i]["wx"] = x
      shape[i]["wy"] = y
    EndIf
    Shapes.Move(shape[i]["obj"], shX + x * s, shY + y * s)
    Shapes.Rotate(shape[i]["obj"], angle + shape[i]["angle"])
  EndFor
  y = Stack.PopValue("local")
  x = Stack.PopValue("local")
  i = Stack.PopValue("local")
EndSub
Sub Slope_Add
  ' param["x1"] - top-left x co-ordinate
  ' param["y1"] - top-left y co-ordinate
  ' param["x2"] - top-right x co-ordinate
  ' param["y2"] - top-right y co-ordinate
  ' param["height"] - height of slope
  ' param["pitch"] - x pitch for diagonal brace
  ' param["color"] - color of slop
  ' return slope
  n = slope["num"]
  n = n + 1
  slope["num"] = n
  GraphicsWindow.PenColor = param["color"]
  x1 = param["x1"]
  y1 = param["y1"]
  x2 = param["x2"]
  y2 = param["y2"]
  GraphicsWindow.DrawLine(x1, y1, x2, y2)
  slope[n]["x1"] = x1
  slope[n]["y1"] = y1
  slope[n]["x2"] = x2
  slope[n]["y2"] = y2
  x = x2 - x1
  y = y2 - y1
  Math_CartesianToPolar()
  slope[n]["ss"] = a
  slope[n]["a"] = y
  slope[n]["b"] = -x
  slope[n]["c"] = -y * x1 + x * y1
  x3 = x1
  y3 = y1 + param["height"]
  x4 = x2
  y4 = y2 + param["height"]
  GraphicsWindow.DrawLine(x3, y3, x4, y4)
  slope[n]["x3"] = x3
  slope[n]["y3"] = y3
  slope[n]["x4"] = x4
  slope[n]["y4"] = y4
  pitch = param["pitch"]
  up = "False"
  For x5 = x1 To x2 - pitch Step pitch
    x6 = x5 + pitch
    If up Then
      y5 = y1 + (y2 - y1) * (x5 - x1) / (x2 - x1)
      y6 = y3 + (y4 - y3) * (x6 - x3) / (x4 - x3)
    Else
      y5 = y3 + (y4 - y3) * (x5 - x3) / (x4 - x3)
      y6 = y1 + (y2 - y1) * (x6 - x1) / (x2 - x1)
    EndIf
    GraphicsWindow.DrawLine(x5, y5, x6, y6)
    up = Not[up]
  EndFor
EndSub

Small Basic version 1.2 en téléchargement sur le site de Microsoft

Pour aller plus loin : s’initier à la programmation en Basic / découvrir le langage VBA / les langages de programmation (histoire de l’informatique)

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Benoît RIVIERE

Après seize années passées en cabinet d’expertise-comptable et de commissariat aux comptes (où j’ai exercé comme expert-comptable et chef de mission audit), j’ai pris le poste de directeur comptable d’un groupe de distribution automobile en novembre 2014. Au cours de ma carrière, j’ai acquis une expérience significative en audit et en exploitation des systèmes d’information (analyse de données, automatisation des tâches, programmation informatique) au service de la production des comptes annuels et consolidés. C’est cette expérience personnelle et ma passion pour l’informatique que je partage sur ce blog. Mon CV / Réalisations personnelles et projets informatiques / Ma collection / Me contacter

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