Hi All,
I have been looking at javascript drawing from this website :
http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
and I am wondering why the author made it
into two images : upper half then lower half?. Is there a rule that
says
you can't do it in one set of calculated values for all the points as
the points
are placed in the document.write( )?
The javascript is placed below for reference:
.....start of copied?
<script type="text/javascript">
document.bgColo r="000000";
var py1=150 // y position of center of pentagon ;
var px=272 // x psition of center of pentagon ;
var r1=150 // radius that just holds pentagon
var ctr=0 ; // division counter ;
anga=(2*Math.PI )/5 ;
sl=r1*Math.sin( (2*Math.PI)/5) ;
d=r1*Math.cos(( Math.PI)/5) ;
e=r1*Math.cos(( 2*Math.PI)/5) ;
h1=d+e ;
f=e*Math.tan(an ga) ;
px1=px-f ; px2=px+f ;
h2=r1-e ;
sbeta=e/r1 ;
gamma=(Math.PI - anga)/2 ;
phi=gamma+Math. asin(sbeta) ;
tphi=Math.tan(p hi) ;
line=px2-px1 ;
for (r=0;r<h2;r=r+1 ) {
z=Math.round((r *line)/(2*h2)) ;
x=px1+z ;
y=py1-r ;
wd=line-2*z ;
rd=255 ; gn=0 ; bl=0 ;
document.write( '<div id=\"a'+ctr+'\" style=\"positio n:absolute;
left:'+x+'px; top:'+y+'px; height: 1px; width:'+wd+'px;
background-color: rgb('+rd+','+gn +','+bl+'); z-index:1;
visibility:visi ble\"><\/div>') ;
ctr=ctr+1 ;
window.status=" DIVISIONS
WRITTEN="+ctr ;
for (r=0;r<h1;r=r+1 ) {
z=Math.round(r/tphi) ;
x=px1+z ;
y=py1+r ;
wd=line-2*z ;
rd=255 ; gn=0 ; bl=0 ;
document.write( '<div id=\"a'+ctr+'\" style=\"positio n:absolute;
left:'+x+'px; top:'+y+'px; height: 1px; width:'+wd+'px;
background-color: rgb('+rd+','+gn +','+bl+'); z-index:1;
visibility:visi ble\"><\/div>') ;
ctr=ctr+1 ;
window.status=" DIVISIONS WRITTEN="+ctr ;
}
</script>
</head>
<body>
<script type="text/javascript">
if (px1<0 || px1>544 || px2<=px1 || px2>544) {
window.status=" Input values too extreme." } ;
</script>
.....end of copied
TIA
bH 15  2936 
bH wrote:
I have been looking at javascript drawing from this website :
http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
and I am wondering why the author made it into two images : upper half
then lower half?.
There are no images. Firebug shows there are but a number of generated 1px
high HTML `div' elements, a rather stupid design.
Is there a rule that says you can't do it in one set of calculated values
for all the points as the points are placed in the document.write( )?
There is a rule that says: the right tool for the right purpose. The right
tool here is (standards-compliant) SVG (which is supported well enought to
be used in Wikipedia for all kinds of scalable graphics) or maybe
(proprietary) Canvas; certainly not plain HTML. The whole thing there is a
nice inefficient beginner's exercise, nothing more.
PointedEars
--
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee
bH a écrit :
Hi All,
I have been looking at javascript drawing from this website :
http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
In same idea :
<http://www.walterzorn. com/jsgraphics/jsgraphics_e.ht m>
and I am wondering why the author made it
into two images : upper half then lower half?.
perhaps because he could not resolve the drawing of a pentagone ?
and preferred to draw a triangle then a trapeze ?
How do you do to find the position of the 5 points of a pentagone
(relatively to x and y axes)
Same question using canvas or svg ... ? !
--
sm
Thomas 'PointedEars' Lahn wrote:
bH wrote:
>I have been looking at javascript drawing from this website :
>http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
and I am wondering why the author made it into two images : upper half
then lower half?.
There are no images. *Firebug shows there are but a number of generated1px
high HTML `div' elements, a rather stupid design.
>Is there a rule that says you can't do it in one set of calculated values
for all the points as the points are placed in the document.write( *)?
There is a rule that says: the right tool for the right purpose. *The right
tool here is (standards-compliant) SVG (which is supported well enought to
be used in Wikipedia for all kinds of scalable graphics) or maybe
(proprietary) Canvas; certainly not plain HTML.
I would probably prefer a Google Chart that outputs PNG to an <img
srccall. For example, the requirement of the original poster: http://chart.apis.google.com/chart?c...chf=c,s,000000
Manual: http://code.google.com/apis/chart/
--
Bart
On Aug 2, 9:31*am, Bart Van der Donck <b...@nijlen.co mwrote:
Thomas 'PointedEars' Lahn wrote:
bH wrote:
I have been looking at javascript drawing from this website :
>http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
and I am wondering why the author made it into two images : upper half
then lower half?.
There are no images. *Firebug shows there are but a number of generated 1px
high HTML `div' elements, a rather stupid design.
Is there a rule that says you can't do it in one set of calculated values
for all the points as the points are placed in the document.write( *)?
There is a rule that says: the right tool for the right purpose. *Theright
tool here is (standards-compliant) SVG (which is supported well enoughtto
be used in Wikipedia for all kinds of scalable graphics) or maybe
(proprietary) Canvas; certainly not plain HTML.
I would probably prefer a Google Chart that outputs PNG to an <img
srccall. For example, the requirement of the original poster:
http://chart.apis.google.com/chart?c...d=t:70,70,70,7...
Manual:http://code.google.com/apis/chart/
--
*Bart- Hide quoted text -
- Show quoted text -
Hi Bart,
The demo is really an eye popper. And it was easy to make color
and size adjustments. For me it was a first time to visit this
web site.
Thanks
bH
bH wrote:
On Aug 2, 9:31*am, Bart Van der Donck <b...@nijlen.co mwrote:
>http://chart.apis.google.com/chart?c...chf=c,s,000000
The demo is really an eye popper. And it was easy to make color
and size adjustments. For me it was a first time to visit this
web site.
Thanks. I think the other equivalents are also quite easy.
--------------------------------------------------------------------
pentagon.svg http://www.w3.org/TR/SVG/shapes.html#PolygonElement
--------------------------------------------------------------------
<?xml version="1.0" standalone="yes "?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg width="400" height="400" style="backgrou nd-color: black"
xmlns="http://www.w3.org/2000/svg" version="1.1">
<polygon fill="red" stroke="red" stroke-width="1"
points="145,15 277,111 227,266 63,266 13,111" />
</svg>
--------------------------------------------------------------------
Problem is that MSIE doesn't know the .svg-extension, so it will offer
the file for download by default. One could do it in (the immensely
inpopular) VML, like e.g. Google Maps does.
--------------------------------------------------------------------
pentagon.htm for MSIE http://msdn.microsoft.com/en-us/libr...80(VS.85).aspx
--------------------------------------------------------------------
<html>
<head>
<title>Red Pentagon in VML</title>
<style>
v\: * {
behavior:url(#d efault#VML);
display:inline-block
}
</style>
</head>
<body style="backgrou nd-color: black">
<xml:namespac e ns="urn:schema s-microsoft-com:vml" prefix="v"/>
<v:polyline strokecolor="re d" strokeweight="1 px" fillcolor="red"
points="145px,1 5px,277px,111px ,227px,266px,63 px,266px,13px,1 11px"
/>
</body>
</html>
--------------------------------------------------------------------
Walter Zorn has done investigations how to do it in javascript : http://www.walterzorn.com/ http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm
Generally, I think the Google Chart should be the best choice here.
Cheers
--
Bart
On Aug 1, 8:19*pm, Thomas 'PointedEars' Lahn <PointedE...@we b.de>
wrote:
maybe (proprietary) Canvas;
As "propietary " as any other w3c open standard can be : <http://
www.w3.org/TR/html5/the-canvas.html#the-canvas>
--Jorge.
Bart Van der Donck wrote:
Walter Zorn has done investigations how to do it in javascript:
http://www.walterzorn.com/
http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm
It talks about "canvas", but eventually it is just a more sophisticated
`div' element nonsense.
PointedEars
--
var bugRiddenCrashP ronePieceOfJunk = (
navigator.userA gent.indexOf('M SIE 5') != -1
&& navigator.userA gent.indexOf('M ac') != -1
) // Plone, register_functi on.js:16
On Aug 3, 10:21*am, Thomas 'PointedEars' Lahn <PointedE...@we b.de>
wrote:
Bart Van der Donck wrote:
Walter Zorn has done investigations how to do it in javascript:
http://www.walterzorn.com/
http://www.walterzorn.com/jsgraphics/jsgraphics_e.htm
It talks about "canvas", but eventually it is just a more sophisticated
`div' element nonsense.
PointedEars
--
var bugRiddenCrashP ronePieceOfJunk = (
* * navigator.userA gent.indexOf('M SIE 5') != -1
* * && navigator.userA gent.indexOf('M ac') != -1
) *// Plone, register_functi on.js:16
Hi All,
Thanks for your efforts to present the "store house of graphic
options"
I would guess that it would take a while to "discover" those (+,+)and
(-,-)
of each.
bH
P.S Bart, up above, you wrote "One could do it in (the immensely
inpopular) VML" was that a typo for "unpopular" .
if it is, I would like to ask "why is it unpopular?"
On Aug 2, 2:19*am, Thomas 'PointedEars' Lahn <PointedE...@we b.de>
wrote:
bH wrote:
I have been looking at javascript drawing from this website :
http://www.cwdjr.net/geometricDraw/pentagon_draw.h tml"
and I am wondering why the author made it into two images : upper half
then lower half?.
There are no images. *Firebug shows there are but a number of generated1px
high HTML `div' elements, a rather stupid design.
There is a rule that says: the right tool for the right purpose. *The right
tool here is (standards-compliant) SVG (which is supported well enought to
be used in Wikipedia for all kinds of scalable graphics)
SVG is unfortunately not well supported at all. On IE and Firefox <= 2
you'd need the Adobe SVG plugin to see SVG on web pages. Unfortunately
that plugin is nowhere near as polished as Adobe's Flash plugin. It
crashed both IE and Firefox the last time I tried it and when it works
the rendering was buggy for some of my SVG files.
For the record, Wikipedia does not *serve* SVG content. They just
allow you to upload SVG files which they'll automatically render to
PNG on their server. Saying SVG support on the web is good because you
can use them on Wikipedia is like saying MS Word doc file support on
the web is good because you can use then on Google Docs. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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