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<body class="article">
<div id="header">
<h1>Listing of doc/example-scripts/tk-locomotive.tcl</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Example by &lt;Richard Suchenwirth&gt;
<a href="http://wiki.tcl.tk/1329">http://wiki.tcl.tk/1329</a></p></div>
<div class="ulist"><ul>
<li>
<p>
translated from Tcl to XOTcl by gustaf neumann in 2001
</p>
</li>
<li>
<p>
translated from XOTcl to NX by gustaf neumann in 2010
</p>
</li>
</ul></div>
<div class="imageblock">
<div class="content">
<img src="tk-locomotive.png" alt="tk-locomotive.png" />
</div>
</div>
<div class="paragraph"><p>Left mousebutton starts, middle slows down, right stops</p></div>
<div class="listingblock">
<div class="content"><style type='text/css'>
.nx             {color: #000000; font-weight: normal; font-style: normal; padding-left: 10px}
table.nx        {border-collapse: collapse; border-spacing: 3px;}
.nx-linenr      {border-right: 1px solid #DDDDDD;padding-right: 5px; color: #2B547D;font-style: italic;}
.nx-string      {color: #779977; font-weight: normal; font-style: italic;}
.nx-comment     {color: #717ab3; font-weight: normal; font-style: italic;}
.nx-keyword     {color: #7f0055; font-weight: normal; font-style: normal;}
.nx-placeholder {color: #AF663F; font-weight: normal; font-style: italic;}
.nx-variable    {color: #AF663F; font-weight: normal; font-style: normal;}
</style>
<pre class='nx'><span class='nx-keyword'>package</span> <span class='nx-keyword'>require</span> Tk
<span class='nx-keyword'>package</span> <span class='nx-keyword'>require</span> nx
<span class='nx-keyword'>package</span> <span class='nx-keyword'>require</span> nx::trait

<span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> Wheel {
  <span class='nx-keyword'>:property</span> x
  <span class='nx-keyword'>:property</span> y
  <span class='nx-keyword'>:property</span> r
  <span class='nx-keyword'>:property</span> {spokes 24}
  <span class='nx-keyword'>:property</span> {pivot 0}
  <span class='nx-keyword'>:property</span> {color red}
  <span class='nx-keyword'>:property</span> {tag <span class='nx-string'>""</span>}

  <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> drawSpokes {} {
    ::nx::var import [<span class='nx-keyword'>:info</span> parent] c alpha
    <span class='nx-keyword'>set</span> delta [<span class='nx-keyword'>expr</span> {360.0 / <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:spokes}</span>}]
    <span class='nx-keyword'>set</span> deg2arc [<span class='nx-keyword'>expr</span> {atan(1.0)*8/360.}]
    <span class='nx-keyword'>for</span> {<span class='nx-keyword'>set</span> i 0} {<span class='nx-[namespace tail [nx::self]]'>$i</span> &lt; <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:spokes}</span>} {<span class='nx-keyword'>incr</span> i} {
      <span class='nx-keyword'>set</span> x1 [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> + cos(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span>*<span class='nx-[namespace tail [nx::self]]'>$alpha</span>) * <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}]
      <span class='nx-keyword'>set</span> y1 [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> + sin(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span>*<span class='nx-[namespace tail [nx::self]]'>$alpha</span>) * <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}]
      <span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> line <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> <span class='nx-[namespace tail [nx::self]]'>$x1</span> <span class='nx-[namespace tail [nx::self]]'>$y1</span> -fill <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:color}</span> -tag spoke
      <span class='nx-keyword'>set</span> alpha [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$alpha</span> + <span class='nx-[namespace tail [nx::self]]'>$delta</span>}]
    }
    <span class='nx-keyword'>if</span> {[<span class='nx-keyword'>info</span> exists :act_pivot]} {
      <span class='nx-keyword'>lassign</span> [<span class='nx-keyword'>set</span> :act_pivot] item perc
      <span class='nx-keyword'>set</span> rp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span> * <span class='nx-[namespace tail [nx::self]]'>$perc</span>}]
      <span class='nx-keyword'>set</span> xp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>$rp</span> * cos(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span> * <span class='nx-[namespace tail [nx::self]]'>$alpha</span>)}]
      <span class='nx-keyword'>set</span> yp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>$rp</span> * sin(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span> * <span class='nx-[namespace tail [nx::self]]'>$alpha</span>)}]
      <span class='nx-[namespace tail [nx::self]]'>$c</span> coords <span class='nx-[namespace tail [nx::self]]'>$item</span> <span class='nx-[namespace tail [nx::self]]'>$xp</span> <span class='nx-[namespace tail [nx::self]]'>$yp</span> [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$xp</span> + 1}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$yp</span> + 1}]
    }
  }

  <span class='nx-keyword'>:method</span> <span class='nx-keyword'>init</span> {} {
    ::nx::var import [<span class='nx-keyword'>:info</span> parent] c alpha
    <span class='nx-keyword'>set</span> alpha 0.

    <span class='nx-keyword'>set</span> :y [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}]
    <span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> oval \
        [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}] \
        [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> + <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> + <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>}] \
        -outline white
    <span class='nx-keyword'>set</span> r1 [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span>-2}]
    <span class='nx-keyword'>set</span> W [<span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> oval \
               [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] \
               [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> + <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> + <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] \
               -outline <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:color}</span> -width 2]
    :drawSpokes

    <span class='nx-keyword'>if</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:pivot}</span>} {
      <span class='nx-keyword'>set</span> deg2arc [<span class='nx-keyword'>expr</span> {atan(1.0) * 8 / 360.0}]
      <span class='nx-keyword'>set</span> rp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$r1</span>*<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:pivot}</span>}]
      <span class='nx-keyword'>set</span> xp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>$rp</span> * cos(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span> * <span class='nx-[namespace tail [nx::self]]'>$alpha</span>)}]
      <span class='nx-keyword'>set</span> yp [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>$rp</span> * sin(<span class='nx-[namespace tail [nx::self]]'>$deg2arc</span> * <span class='nx-[namespace tail [nx::self]]'>$alpha</span>)}]
      <span class='nx-keyword'>set</span> new_pivot [<span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> rect <span class='nx-[namespace tail [nx::self]]'>$xp</span> <span class='nx-[namespace tail [nx::self]]'>$yp</span> [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$xp</span> + 1}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$yp</span> + 1}] \
                         -fill <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:color}</span> -tag [<span class='nx-keyword'>list</span> <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:tag}</span> pivot]]
      <span class='nx-keyword'>set</span> :act_pivot [<span class='nx-keyword'>list</span> <span class='nx-[namespace tail [nx::self]]'>$new_pivot</span> <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:pivot}</span>]

      <span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> arc [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>$r1</span>}]\
          [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> + <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> + <span class='nx-[namespace tail [nx::self]]'>$r1</span>}] \
          -style chord -fill <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:color}</span> -start 310 \
          -extent 80 -tag counterweight
      <span class='nx-keyword'>set</span> :pivot <span class='nx-[namespace tail [nx::self]]'>$new_pivot</span>
    }
    <span class='nx-keyword'>set</span> rh [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:r}</span> / 12.0}]
    <span class='nx-[namespace tail [nx::self]]'>$c</span> <span class='nx-keyword'>create</span> oval \
        [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> - <span class='nx-[namespace tail [nx::self]]'>$rh</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> - <span class='nx-[namespace tail [nx::self]]'>$rh</span>}] \
        [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:x}</span> + <span class='nx-[namespace tail [nx::self]]'>$rh</span>}] [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:y}</span> + <span class='nx-[namespace tail [nx::self]]'>$rh</span>}] \
        -fill white -tag hub
    <span class='nx-keyword'>set</span> :r <span class='nx-[namespace tail [nx::self]]'>$r1</span>
  }
}


<span class='nx-keyword'>nx::Class</span> <span class='nx-keyword'>create</span> Locomotive {
  <span class='nx-keyword'>:property</span> {speed 4}

  <span class='nx-keyword'>:require</span> trait nx::trait::callback

  <span class='nx-keyword'>:method</span> turn {} {
    <span class='nx-keyword'>set</span> :alpha [<span class='nx-keyword'>expr</span> {round(<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:alpha}</span> + 360 - <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:speed}</span>) % 360}]
    <span class='nx-keyword'>foreach</span> i [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> find withtag counterweight] {
      <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> itemconfig <span class='nx-[namespace tail [nx::self]]'>$i</span> -start [<span class='nx-keyword'>expr</span> {310 - <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:alpha}</span>}]
    }
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>delete</span> spoke
    <span class='nx-keyword'>foreach</span> wheel [<span class='nx-keyword'>:info</span> children] { <span class='nx-[namespace tail [nx::self]]'>$wheel</span> drawSpokes }
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> raise hub
    <span class='nx-keyword'>set</span> xp0 [<span class='nx-keyword'>expr</span> {105 + 15 * sin((<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:alpha}</span> - 90) * atan(1.0) * 8 / 360)}]
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>delete</span> piston
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> coords p0 <span class='nx-[namespace tail [nx::self]]'>$xp0</span> 120 [<span class='nx-keyword'>expr</span> {<span class='nx-[namespace tail [nx::self]]'>$xp0</span>+2}] 122 ;<span class='nx-[namespace tail [nx::self]]'>#CW
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> line 90 121 <span class='nx-[namespace tail [nx::self]]'>$xp0</span> 121 -width 2 -fill white -tag piston ;<span class='nx-[namespace tail [nx::self]]'>#CW
</span>    :drawRod p0 p1 p2 p3
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> raise p0
    <span class='nx-keyword'>foreach</span> i [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> find withtag smoke] {
      <span class='nx-keyword'>if</span> {[<span class='nx-keyword'>lindex</span> [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> bbox <span class='nx-[namespace tail [nx::self]]'>$i</span>] 3]&lt;0} {
        <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>delete</span> <span class='nx-[namespace tail [nx::self]]'>$i</span>
      } <span class='nx-keyword'>else</span> {
        <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>move</span> <span class='nx-[namespace tail [nx::self]]'>$i</span> [<span class='nx-keyword'>expr</span> {rand() * <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:speed}</span> / 3.0}] [<span class='nx-keyword'>expr</span> {rand() * 2 - 2}]
      }
    }
    <span class='nx-keyword'>set</span> t [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> oval [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> bbox chimney] -fill white -outline white -tag smoke]
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>move</span> <span class='nx-[namespace tail [nx::self]]'>$t</span> 0 -10
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> lower smoke
  }

  <span class='nx-keyword'>:method</span> drawRod {p0 p1 p2 p3} {
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>delete</span> rod
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> bbox <span class='nx-[namespace tail [nx::self]]'>$p1</span> <span class='nx-[namespace tail [nx::self]]'>$p3</span>] -fill white -tag rod
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> line {*}[<span class='nx-keyword'>lrange</span> [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> bbox <span class='nx-[namespace tail [nx::self]]'>$p0</span>] 0 1] \
        {*}[<span class='nx-keyword'>lrange</span> [<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> bbox <span class='nx-[namespace tail [nx::self]]'>$p2</span>] 0 1] -width 3 -fill white -tag rod
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> raise rod
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> raise pivot
  }

  <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> tick {} {
    :turn
    <span class='nx-keyword'>foreach</span> i [<span class='nx-keyword'>after</span> <span class='nx-keyword'>info</span>] {<span class='nx-keyword'>after</span> cancel <span class='nx-[namespace tail [nx::self]]'>$i</span>}
    <span class='nx-keyword'>after</span> 10 [<span class='nx-keyword'>self</span>] tick
  }

  <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> throttle {} {
    <span class='nx-keyword'>incr</span> :speed 2
    :tick
  }

  <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> <span class='nx-keyword'>break</span> {} {
    <span class='nx-keyword'>incr</span> :speed -2
    <span class='nx-keyword'>if</span> {<span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:speed}</span>&lt;0} {<span class='nx-keyword'>set</span> :speed 0}
    :tick
  }

  <span class='nx-keyword'>:public</span> <span class='nx-keyword'>method</span> emergencyBreak {} {
    <span class='nx-keyword'>set</span> :speed 0
    :tick
  }

  <span class='nx-keyword'>:method</span> <span class='nx-keyword'>init</span> {} {
    <span class='nx-keyword'>set</span> :c [canvas .c -width 600 -height 160 -background lightblue]
    pack <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span>

    bind <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <b>&lt;1&gt;</b> [:callback throttle]
    bind <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <b>&lt;2&gt;</b> [:callback <span class='nx-keyword'>break</span>]
    bind <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <b>&lt;3&gt;</b> [:callback emergencyBreak]

    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>delete</span> all
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 32 115 360 125 -fill black ;<span class='nx-[namespace tail [nx::self]]'># frame
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 22 118 32 122 -fill grey30 ;<span class='nx-[namespace tail [nx::self]]'># buffer
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> line 22 115 22 125
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> poly 60 95 40 115 50 115 70 95 -fill black
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 60 45 310 95 -fill grey25 ;<span class='nx-[namespace tail [nx::self]]'># boiler
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> oval 55 50 65 90 -fill black ;<span class='nx-[namespace tail [nx::self]]'># smokebox
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 70 32 85 50 -fill black -tag chimney
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 40 52 90 75 -fill black ;<span class='nx-[namespace tail [nx::self]]'># wind diverter
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> oval 130 36 150 52 -fill black ;<span class='nx-[namespace tail [nx::self]]'># dome
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 195 35 215 50 -fill black ;<span class='nx-[namespace tail [nx::self]]'># sandbox
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> oval 260 36 280 52 -fill black ;<span class='nx-[namespace tail [nx::self]]'># dome
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 65 100 90 135 -fill black ;<span class='nx-[namespace tail [nx::self]]'># cylinder
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 90 120 92 122 -fill red -tag p0 ;<span class='nx-[namespace tail [nx::self]]'># crossbar
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 72 87 82 100 -fill black ;<span class='nx-[namespace tail [nx::self]]'># steam tube
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 310 40 370 115 -fill black ;<span class='nx-[namespace tail [nx::self]]'># cab
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 310 32 390 42 -fill grey30 ;<span class='nx-[namespace tail [nx::self]]'># cab roof
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> text 338 82 -text <span class='nx-string'>"01 234"</span> -fill gold -font {Times 7}
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 318 48 333 66 -fill white ;<span class='nx-[namespace tail [nx::self]]'># cab window #1
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 338 48 355 66 -fill white ;<span class='nx-[namespace tail [nx::self]]'># cab window #2
</span>    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 50 -y 150 -r 13 -spokes 12
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 105 -y 150 -r 13 -spokes 12
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 150 -y 150 -r 30 -pivot 0.5 -tag p1
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 215 -y 150 -r 30 -pivot 0.5 -tag p2
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 280 -y 150 -r 30 -pivot 0.5 -tag p3
    :drawRod p0 p1 p2 p3
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 340 -y 150 -r 16 -spokes 12
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 360 110 380 118 -fill black
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 380 65 560 125 -fill black -tag tender
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 560 118 570 122 -fill grey30 ;<span class='nx-[namespace tail [nx::self]]'># buffer
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> line 571 116 571 125
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 390 45 525 65 -fill black -tag tender
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 395 -y 150 -r 13 -spokes 12
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 440 -y 150 -r 13 -spokes 12
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 380 132 456 142 -fill red
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 495 -y 150 -r 13 -spokes 12
    Wheel <span class='nx-keyword'>new</span> -childof [<span class='nx-keyword'>self</span>] -x 540 -y 150 -r 13 -spokes 12
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 480 132 556 142 -fill red -outline red
    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> rect 0 150 600 160 -fill brown ;<span class='nx-[namespace tail [nx::self]]'># earth
</span>    <span class='nx-[namespace tail [nx::self]]'>${</span><span class='nx-variable'>:c}</span> <span class='nx-keyword'>create</span> line 0 150 600 150 -fill grey -width 2 ;<span class='nx-[namespace tail [nx::self]]'># rail
</span>    :tick
  }
}

Locomotive <span class='nx-keyword'>new</span></pre></div></div>
</div>
</div>
</div>
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Last updated 2016-12-23 11:01:33 CET
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