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RE: SVG 1.2 Working Draft: Comments on 3.2.7 Expression-based at tribute values

From: Fred P. <fprog26@hotmail.com>
Date: Sat, 17 May 2003 18:48:05 -0400
To: arazdow@mathsoft.com, www-svg@w3.org
Cc: Kim.Marriott@infotech.monash.edu.au
Message-ID: <BAY2-F141ERRFKJV7Vp0000664a@hotmail.com>

Study case:  A simple flexible design - Grid VS onRefresh JavaScript Event 
Handler

Let's take a simple case of springs:
------------------------------------

(0,0)
.0         1         2         3
.012345678901234567890123456789012345
0+----------------------------------+
1|          z            z          |
2|   (9,3)  z    (22,3)  z          |
3|        +---+        +---+        |
4|zzzzzzzz| A |zzzzzzzz| B |zzzzzzzz|
5|        +---+        +---+        |
6|          z            z          |
7|          z            z          |
8+----------------------------------+ (W,H)


Spring conversion into one-way constraint functions
can be derived with some low level logic:

Notice that any thing calculation are integer based mostly using floor(x)

A.x = (document.width  - A.width  - B.width) * 1/3 + 1
A.x = (35 - 5 - 5) * 1/3 + 1
A.x = (25        ) * 1/3 + 1
A.x = 8.33 + 1
A.x = 9.33
A.x = 9

A.y = (document.height - A.height - B.height) * 1/2 + 1
A.y = (8 - 3) / 2 + 1
A.y = 5 /2 + 1
A.y = 2.5 + 1
A.y = 3.5
A.y = 3

B.x = (document.width  - A.width  - B.width) * 2/3 + A.width + 1
B.x = (35 - 5 - 5) * 2/3 + 5 + 1
B.x = (25        ) * 2/3 + 5 + 1
B.x = 16.67 + 6
B.x = 22.67
B.x = 22

B.y = (document.height - A.height - B.height) * 1/2 + 1
B.y = (8 - 3) / 2 + 1
B.y = 5 /2 + 1
B.y = 2.5 + 1
B.y = 3.5
B.y = 3

Acyclic Dependancy:
===================

A.width  --> textA.width
A.height --> textA.height
B.width  --> textB.width
B.height --> textB.height

textA.x --> A.x --> document.width  | A.width  | B.width
                --> textA.width     | textB.width

textA.y --> A.y --> document.height | A.height | B.height
                --> textA.height    | textB.height

textB.x --> B.x --> document.width  | A.width  | B.width
                --> textA.width     | textB.width

textB.y --> B.y --> document.height | A.height | B.height
                --> textA.height    | textB.height


Version with onRefresh event handler and JavaScript:
====================================================

(0,0)
.0         1         2         3
.012345678901234567890123456789012345
0+----------------------------------+
1|          z            z          |
2|   (9,3)  z    (22,3)  z          |
3|        +---+        +---+        |
4|zzzzzzzz| A |zzzzzzzz| B |zzzzzzzz|
5|        +---+        +---+        |
6|          z            z          |
7|          z            z          |
8+----------------------------------+ (W,H)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg SYSTEM
"http://www.w3.org/TR/2000/03/WD-SVG-20000303/DTD/svg-20000303-stylable.dtd">
<svg height="600" width="1000">
<defs>
<style type="text/css">
<![CDATA[
svg = { max_iteration: 100; }
]]>
</style>

<!-- Assuming 10px spacing between the box border and the text -->
<script language="JavaScript">
<![CDATA[
var offset = 10px;
]]>
</script>
</defs>

<rect id="A"
      x="100"
      y="100"
      width="100"
      height="100"
      style="fill:#FFFF00; stroke:#000000; shape-rendering: optimizeSpeed;"
onRefresh="javascript:
A.x      = ( (document.width  - A.width  - B.width ) * 1/3 + 1 );
A.y      = ( (document.height - A.height - B.height) * 1/2 + 1 );
A.width  = ( offset + textA.width  + offset );
A.height = ( offset + textA.height + offset );
"/>
<rect id="B"
      x="150"
      y="100"
      width="100"
      height="100"
      style="fill:#00FFFF; stroke:#000000; shape-rendering: optimizeSpeed;"
onRefresh="javascript:
  B.x      = ( (document.width  - A.width  - B.width ) * 2/3 + A.width + 1 
);
  B.y      = ( (document.height - A.height - B.height) * 1/2 + 1 );
  B.width  = ( offset + textB.width  + offset );
  B.height = ( offset + textB.height + offset );
"/>

<text id="textA"
      x="110"
      y="110"
      style="font:arial; font-size:8pt; text-rendering:optimizeSpeed;"
onRefresh="javascript:
  textA.x = ( A.x + offset );
  textA.y = ( A.y + offset );
">A</text>

<text id="textB"
      x="160"
      y="110"
      style="font:arial; font-size:8pt; text-rendering:optimizeSpeed;"
onRefresh="javascript:
  textB.x = ( B.x + offset );
  textB.y = ( B.y + offset );
">B</text>

<!--   d[0] d[1] d[2] d[3] d[4] d[5] d[6] d[7] d[8] d[9] d[10] d[11] d[12] 
-->
<path d="M   10   10    l    5    0    l    0    5    l    -5     0     z"
      style="fill:#00FFFF; stroke:#000000; shape-rendering: optimizeSpeed;"
onRefresh="javascript:
  var len = 50px;
  // Modify d[1]
  if ( viewport.right-viewport.left > 10px )
  { this.path.d[1] = viewport.left+10px; }
  else
  { this.path.d[1] = 0.5*viewport.right+0.5*viewport.left; }
  this.path.d[ 4] =  len;
  this.path.d[ 8] =  len;
  this.path.d[10] = -len;
"/>
</svg>


Version with Grids:
===================

(0,0)
.0         1         2         3
.012345678901234567890123456789012345
0+----------------------------------+
1|          z            z          |
2|   (9,3)  z    (22,3)  z          |
3|        +---+        +---+        |
4|zzzzzzzz| A |zzzzzzzz| B |zzzzzzzz|
5|        +---+        +---+        |
6|          z            z          |
7|          z            z          |
8+----------------------------------+ (W,H)


Grid version:
-------------

(0,0)
.0         1         2         3
.012345678901234567890123456789012345
0+--------+---+--------+---+--------+
1|        | z |        | z |        |  50%
2|   (9,3)| z |  (22,3)| z |        |
3+--------+---+--------+---+--------+
4|zzzzzzzz| A |zzzzzzzz| B |zzzzzzzz|   *
5+--------+---+--------+---+--------+
6|        | z |        | z |        |
7|        | z |        | z |        |  50%
8+--------+---+--------+---+--------+ (W,H)
     33%    *     33%    *     33%

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg SYSTEM
"http://www.w3.org/TR/2000/03/WD-SVG-20000303/DTD/svg-20000303-stylable.dtd">
<svg height="600" width="1000">
<defs>
  <!-- Creates the box with an A in it -->
  <g id='groupA'>
    <grid>
      <!-- Assuming 10px spacing between the box border and the text -->
      <cell row='1'
            col='1'
            rowspan='1'
            colspan='1'
            cellspacing='10px'
            cellpadding='1px'
            style="fill:#FFFF00; stroke:#000000; shape-rendering: 
optimizeSpeed;"
            shape="rect"
       ><text id="textA"
         style="font:arial; font-size:8pt; text-rendering:optimizeSpeed;"
         >A</text>
      </cell>
    </grid>
  </g>

  <!-- Creates the box with a B in it -->
  <g id='groupB'>
    <grid>
      <!-- Assuming 10px spacing between the box border and the text -->
      <cell row='1'
            col='1'
            rowspan='1'
            colspan='1'
            cellspacing='10px'
            cellpadding='1px'
            style="fill:#00FFFF; stroke:#000000; shape-rendering: 
optimizeSpeed;"
            shape="rect"
       ><text id="textA"
         style="font:arial; font-size:8pt; text-rendering:optimizeSpeed;"
         >B</text>
      </cell>
    </grid>
  </g>
</defs>
  <!-- Creates the flexible sizing grid -->
  <grid>
    <!-- First row -->
    <cell row='1'
          col='1'
          rowspan='1'
          colspan='3'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
          width='100%'
          height='50%'
    > </cell>

    <!-- Second row -->
    <cell row='2'
          col='1'
          rowspan='1'
          colspan='1'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
          width='33%'
    > </cell>

    <cell row='2'
          col='2'
          rowspan='1'
          colspan='1'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
    ><use xlink:href='#groupA' x='0' y='0'/></cell>

    <cell row='2'
          col='3'
          rowspan='1'
          colspan='1'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
          width='33%'
    > </cell>

    <cell row='2'
          col='4'
          rowspan='1'
          colspan='1'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
    ><use xlink:href='#groupB' x='0' y='0'/></cell>

    <cell row='2'
          col='5'
          rowspan='1'
          colspan='1'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
          width='33%'
    > </cell>

    <!-- Third row -->
    <cell row='3'
          col='1'
          rowspan='1'
          colspan='3'
          cellspacing='0'
          cellpadding='0'
          shape='rect'
          width='100%'
          height='50%'
    > </cell>

  </grid>
</svg>

Sincerely yours,
Fred.

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Received on Saturday, 17 May 2003 18:48:13 GMT

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