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<!doctype html>
<HTML>
<HEAD>
<TITLE>jsgraphics.html</TITLE>
<META http-equiv=expires content=0>
<META http-equiv=content-type content="text/html; charset=iso-8859-1">
<SCRIPT src="https://littleflute.github.io/vc6/XdHtml/jsgraphics.js" type=text/javascript></SCRIPT>
<script src="https://www.w3schools.com/lib/w3.js"></script>
<script src="https://littleflute.github.io/JavaScript/blclass.js" ></script>
</HEAD>
<BODY bgColor=FloralWhite >
<div id="blPageV">
<a target = "_blank" href='https://github.com/littleflute/JavaScript/edit/master/xdgraph.html'>
v0.0. 111*</a>
<a target = "_blank" href='https://github.com/littleflute/JavaScript/issues/26'>#i26</a>
<button id="id_btn_4_blApp">++++++++++++++++++++++blApp++++++++++++++++++</button>
</div>
<div id="xddbg"></div>
<div id="idMedia"></div>
<script type="text/javascript" src="blclass.js"></script>
<script type="text/javascript" src="xd.js"></script>
<DIV id="xdMain" style="WIDTH: 100%; POSITION: relative; HEIGHT: 230px;border:1px green solid;">
<TABLE id = "xdtable-1" width="100%" style="border:1px red solid;">
<TBODY>
<TR>
<TD height=230></TD></TR></TBODY></TABLE></DIV>
<TABLE style="border:1px red solid;">
<TBODY>
<tr style="background-color:blue;border:1px red solid;"><td>xddbg1:</td></tr>
<TR>
<TD width=80><IMG height=1 alt=""
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=80></TD>
<TD>
<TABLE style="background-color:blue;border:1px red solid;">
<TBODY>
<TR>
<TD><B><BIG>DHTML, JavaScript <BR>Draw Line, Circle, Ellipse (Oval),
Polyline, Polygon, Rectangle.</BIG> <BR>High Performance JavaScript
Vector Graphics Library.</B><BR><SMALL>Developed by Walter
Zorn</SMALL><BR> <BR></TD>
<TD vAlign=top rowSpan=4>
<TABLE cellSpacing=3 cellPadding=0>
<TBODY>
<TR>
<TD width=1 bgColor=#000099><IMG height=1
alt="DHTML, JavaScript: Draw Ellipses, Ovals, Circles, Polygons, Triangles, Rectangles, Lines, Polylines"
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=1></TD>
<TD><SMALL> <BR><A
href="#top">Top</A>
<BR> <BR><A
href="#browser">Cross Browser?</A> <BR> <BR><A
href="#docu">Documentation</A>
<BR> <BR><A
href="#download">Download</A>
<BR> </SMALL></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD>This JavaScript VectorGraphics library provides graphics
capabilities for JavaScript: functions to draw circles, ellipses
(ovals), oblique lines, polylines and polygons (for instance
triangles, rectangles) dynamically into a webpage. Usage of this
Vector Graphics library should be easy even if you don't have
JavaScript experience. <A
href="#docu">Documentation</A>.
Another goal during development of this JavaScript Draw Shapes
Vector Graphics Library was to achieve optimized <A
href="#performance">performance</A>
and cleanly arranged pixel stair-step patterns (pixel-optimization).
</TD></TR>
<TR>
<TD><BIG> <BR> <BR><B>Try it out:</B></BIG> </TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=0 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=white>
<FORM action="">
<TABLE cellSpacing=0>
<TBODY>
<TR align=right>
<TD><INPUT style="WIDTH: 100%" onclick=DRAW(this.value) type=button value=drawLine()></TD>
<TD>x1<INPUT maxLength=4 size=5 value=50
name=dl_x1> </TD>
<TD>y1<INPUT maxLength=4 size=5 value=-330
name=dl_y1> </TD>
<TD>x2<INPUT maxLength=4 size=5 value=500
name=dl_x2> </TD>
<TD>y2<INPUT maxLength=4 size=5 value=800
name=dl_y2> </TD></TR>
<TR align=right>
<TD><INPUT style="WIDTH: 100%" onclick=DRAW(this.value) type=button value=drawRect()></TD>
<TD>x<INPUT maxLength=4 size=5 value=130
name=dr_x> </TD>
<TD>y<INPUT maxLength=4 size=5 value=20
name=dr_y> </TD>
<TD>w<INPUT maxLength=4 size=5 value=490
name=dr_w> </TD>
<TD>h<INPUT maxLength=4 size=5 value=80
name=dr_h> </TD></TR>
<TR align=right>
<TD><INPUT style="WIDTH: 100%" onclick=DRAW(this.value) type=button value=fillRect()></TD>
<TD>x<INPUT maxLength=4 size=5 value=-70
name=fr_x> </TD>
<TD>y<INPUT maxLength=4 size=5 value=130
name=fr_y> </TD>
<TD>w<INPUT maxLength=4 size=5 value=160
name=fr_w> </TD>
<TD>h<INPUT maxLength=4 size=5 value=100
name=fr_h> </TD></TR>
<TR align=right>
<TD><INPUT onclick=DRAW(this.value) type=button value=fillPolygon()></TD>
<TD colSpan=4>x<INPUT size=25 value=80,126,-30,-60
name=fp_x> y<INPUT size=25 value=0,130,40,100
name=fp_y> </TD></TR>
<TR align=right>
<TD><INPUT style="WIDTH: 100%" onclick=DRAW(this.value) type=button value=drawEllipse()></TD>
<TD>x<INPUT maxLength=4 size=5 value=350
name=do_x> </TD>
<TD>y<INPUT maxLength=4 size=5 value=-30
name=do_y> </TD>
<TD>w<INPUT maxLength=3 size=5 value=140
name=do_w> </TD>
<TD>h<INPUT maxLength=4 size=5 value=250
name=do_h> </TD></TR>
<TR align=right>
<TD><INPUT style="WIDTH: 100%" onclick=DRAW(this.value) type=button value=fillEllipse()></TD>
<TD>x<INPUT maxLength=4 size=5 value=20
name=fo_x> </TD>
<TD>y<INPUT maxLength=4 size=5 value=150
name=fo_y> </TD>
<TD>w<INPUT maxLength=4 size=5 value=440
name=fo_w> </TD>
<TD>h<INPUT maxLength=4 size=5 value=800
name=fo_h> </TD></TR>
<TR>
<TD colSpan=5>
<TABLE cellSpacing=0 cellPadding=0 width="100%">
<TBODY>
<TR>
<TD>setColor("#<INPUT maxLength=6 size=7
value=00aaaa name=Color>") </TD>
<TD align=middle>setStroke(<INPUT maxLength=2
size=3 value=4 name=Stroke>) </TD>
<TD align=right>setStroke(Stroke.DOTTED<INPUT
type=checkbox name=Dotted>)
</TD></TR></TBODY></TABLE><INPUT style="FONT-WEIGHT: bold; WIDTH: 290px" onclick=;if(jg2)jg2.clear(); type=button value="clear() this test area">
</TD></TR>
<TR>
<TD colSpan=5 height=250>
<DIV id=dt
style="LEFT: -80px; POSITION: relative; TOP: 10px; HEIGHT: 1px"></DIV>
<DIV id=test
style="Z-INDEX: 2; LEFT: 0px; OVERFLOW: visible; WIDTH: 400px; POSITION: relative; TOP: 0px; HEIGHT: 250px;border:1px solid green;">
<CENTER><SMALL>Test
Canvas</SMALL></CENTER></DIV></TD></TR></TBODY></TABLE></FORM></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE id="xdtable-2" style="background-color:Cornsilk;border:1px red solid;">
<TBODY>
<TR>
<TD width=80><IMG height=1 alt=""
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=80></TD>
<TD>
<TABLE>
<TBODY>
<TR>
<TD><B><BIG> <BR> <BR><A
name=performance></A> <BR>Performance</BIG></B></TD>
<TD vAlign=top rowSpan=4>
<TABLE cellSpacing=3 cellPadding=0>
<TBODY>
<TR>
<TD width=1 bgColor=#000099><IMG height=1
alt="DHTML, JavaScript: Draw Ellipse, Oval, Circle, Polygon, Triangle, Rectangle, Line, Polyline"
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=1></TD>
<TD><SMALL> <BR><A
href="#top">Top
of Page</A> <BR> <BR><A
href="#performance">Performance?</A>
<BR> <BR><A
href="#browser">Cross
Browser?</A> <BR> <BR><A
href="#docu">Documentation</A>
<BR> <BR><A
href="#download">Download</A>
<BR> </SMALL></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD>In HTML there are no such elements as oblique lines, circles,
ellipses or other non-rectangularly bounded elements available. For
a workaround, pixels might be painted by creating small
background-colored layers (DIV elements), and arranging these to the
desired pattern. Creating a separate DIV for each pixel of the
pattern, however, would be very inefficient since each of these DIVs
inevitably has to lug it's complete browser-internal object
overhead.
<SCRIPT type=text/javascript>
<!--
function drwPxOv(hnd, left, top, width, height, fact, bad)
{
var a = width>>1, b = height>>1,
cx = left + a*fact, cy = top + b*fact,
x = 0, y = b,
ox = 0, oy = b,
a2 = (a*a)<<1, b2 = (b*b)<<1,
st = (a2>>1)*(1-(b<<1)) + b2,
tt = (b2>>1) - a2*((b<<1)-1);
if (bad) hnd.drawRect(cx+fact*x, cy-fact*y, fact, fact);
do
{
if (st<0)
{
st += b2*((x<<1)+3);
tt += (b2<<1)*(x+1);
x++;
}
else if (tt<0)
{
st += b2*((x<<1)+3) - (a2<<1)*(y-1);
tt += (b2<<1)*(x+1) - a2*((y<<1)-3);
x++;
y--;
if (!bad) hnd.drawRect(cx+fact*ox, cy-fact*oy, fact*(x-ox), fact*(oy-y));
ox = x;
oy = y;
}
else
{
st -= (a2<<1)*(y-1);
tt -= a2*((y<<1)-3);
y--;
}
if (bad) hnd.drawRect(cx+fact*x, cy-fact*y, fact, fact);
}
while (y>0);
if (!bad) hnd.drawRect(cx+fact*ox, cy-fact*oy, fact*(a-ox+1), fact*(oy+1));
}
/////////////// Pixel stairs demo ///////////////
var jg = new jsGraphics();
jg.htm += '<table align="left" width="354" cellpadding="0"><tr><td height="150" valign="top"><div id="stairsdemo" style="position:relative;width:350px;height:150px;">';
jg.setFont("verdana,geneva,sans-serif", "10px", Font.PLAIN);
jg.setColor("#ee8800");
jg.drawString("Image dynamically drawn with wz_jsgraphics.js", 0, 2);
jg.setFont("verdana,geneva,sans-serif", "11px", Font.PLAIN);
jg.setColor("#ff0099");
jg.drawString("unfavourable", 10, 129);
jg.drawRect(0, 25, 10, 10);
jg.drawRect(10, 25, 10, 10);
jg.drawRect(20, 25, 10, 10);
jg.drawRect(20, 35, 10, 10);
jg.drawRect(30, 35, 10, 10);
jg.drawRect(40, 35, 10, 10);
jg.drawRect(40, 45, 10, 10);
jg.drawRect(50, 45, 10, 10);
jg.drawRect(60, 45, 10, 10);
jg.drawRect(60, 55, 10, 10);
jg.drawRect(60, 65, 10, 10);
jg.drawRect(70, 65, 10, 10);
jg.drawRect(70, 75, 10, 10);
jg.drawRect(70, 85, 10, 10);
jg.drawRect(80, 85, 10, 10);
jg.drawRect(80, 95, 10, 10);
jg.drawRect(80, 105, 10, 10);
jg.setColor("#008800");
jg.drawString("better", 130, 129);
//drwPxOv(jg, 30, 25, 16, 16, 10, true);
jg.setColor("#0000cc");
jg.drawString("optimal", 260, 129);
//drwPxOv(jg, 150, 25, 16, 16, 10);
jg.htm += '<\/div><\/td><\/tr><\/table>';
//jg.paint();
//-->
</SCRIPT>
<BR> <BR>To minimize the amount of this overhead and to
optimize performance to what's possible, this Draw Shapes JavaScript
VectorGraphics Library, besides using fast algorithms (based on
Bresenham algorithms) to compute the shapes, minimizes the number of
required DIVs by combining as many pixels into each DIV as possible.
Therefore, as illustrated by the picture on the left, the number of
DIV elements is decreased <B><A
href="#notes">[1]</A></B>
from one per pixel to one per pixel stair-step.
<BR> <BR><B>However, don't compare the performance with Java or
stand-alone applications!</B> Making a browser create DIV elements
is of course much slower than just colouring pixels. Even this
JavaScript Vectorgraphics Library can't escape from this fundamental
restriction - it just tries to squeeze out the maximum of what's
possible. It's recommended to refrain from creating shapes that
extend more than 600 - 1000 pixels in both dimensions.
<BR> <BR><B>Alternative to SVG?</B> Currently SVG-capable
browsers or browsers with a correctly included SVG plugin are still
rare. Therefore you might use this vector graphics library as an
non-proprietary alternative for small or not-too-complex graphic
elements, presumably running on the machines of more than 95% of all
internet visitors. Moreover, since this vectorgraphics library
allows graphics to overflow the borders of their "canvases", it can
render to almost everywhere on a page. </TD></TR>
<TR>
<TD><BIG> <BR> <BR><A
name=browser></A> <BR> <BR><B>Cross Browser
Functionality?</B></BIG> </TD></TR>
<TR>
<TD>Linux: <BR>Browsers with Gecko-Engine (Mozilla,
Netscape 6+, Galeon), Konqueror, Netscape 4, Opera 5,
6 and 7. <BR> <BR>Windows: <BR>Gecko-Browsers, IE 4, 5 and 6,
Netscape 4, Opera 5, 6 and 7. <BR> <BR>Mac:
<BR>Safari, Gecko-Browsers, Opera, Netscape 4, partially IE.
<BR> <BR>The functionality "Draw into html elements even after
the page has fully loaded" isn't available for Opera prior to
version 7 and Netscape 4, whereas "Draw into the document
while the page is parsed" is cross-browser capable. </TD></TR>
<TR>
<TD><BIG> <BR> <BR><A
name=docu></A> <BR> <BR> <BR><B>Documentation: How to
Use the JavaScript Graphics Library</B></BIG> </TD>
<TD><BR></TD></TR>
<TR>
<TD><B><BIG>1.</BIG> Include the Library</B> <BR>Insert the
following code into the head-section of the html file (between
<head> and </head>): </TD>
<TD><BR></TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=#eeeeee><TT><FONT style="FONT-SIZE: 12px"
size=2><script type="text/javascript"
src="wz_jsgraphics.js"></script><BR></FONT></TT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
<TD><BR></TD></TR>
<TR>
<TD><B> <BR><BIG>2.</BIG> HTML: <div> Elements as
Canvases</B> <BR>This step isn't required for the mode "Draw
directly into the document while the page is parsed". To draw into
DIV elements even after the page has fully loaded, however,
relatively as well as absolutely positioned layers (DIV elements)
are appropriate to serve as canvases. Each of these layers must have
a unique ID: <BR><div id="myCanvas"
style="position:relative;height:250px;width:100%;"></div><BR>...<BR><div
id="anotherCanvas"
style="position:relative;height:100px;width:300px;"></div>
</TD>
<TD><BR></TD></TR>
<TR>
<TD><B> <BR><BIG>3.</BIG> Save the JavaScript Vectorgraphics
Library</B> <BR><A
href="#download">Download
the JavaScript Vector Graphics Library</A> and unzipp it into the
same directory as the html file. If you'd prefer the library to be
placed in a different directory, adapt the path
src="wz_jsgraphics.js" in the code piece above.<BR></TD>
<TD><BR></TD></TR>
<TR>
<TD><BIG> <BR> <BR> <BR> <BR> <BR> <BR><B>How
to Draw Shapes</B></BIG> </TD>
<TD vAlign=top rowSpan=4>
<TABLE cellSpacing=3 cellPadding=0>
<TBODY>
<TR>
<TD width=1 bgColor=#000099><IMG height=1
alt="DHTML, JavaScript: Draw Ellipses, Ovals, Circles, Polygons, Triangles, Rectangles, Lines, Polylines"
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=1></TD>
<TD><SMALL> <BR><A
href="#top">Top
of Page</A> <BR> <BR><A
href="#performance">Performance?</A>
<BR> <BR><A
href="#browser">Cross
Browser?</A> <BR> <BR><A
href="#docu">Documentation</A>
<BR> <BR><A
href="#download">Download</A>
<BR> </SMALL></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD><B><BIG>1.</BIG> Create a jsGraphics Object</B> <BR><B>a) Draw
into DIV elements even after the page has fully loaded:</B>
<BR>(This mode doesn't work in Netscape 4 and
Opera < 7.) See the example below how to create a
jsGraphics object for a certain DIV element. This code should be
inserted into the html code past the concerned DIV element, but in
any case ahead of the closing body tag. The ID (in quotation marks)
of the selected DIV element must be passed to the constructor
function <TT>new jsGraphics()</TT>:<BR></TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=#eeeeee><TT><FONT style="FONT-SIZE: 12px"
size=2><script
type="text/javascript"><BR><!--<BR><BR>var jg =
new
jsGraphics("myCanvas");<BR><BR>//--><BR></script>
</FONT></TT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD>If there are several separate DIV elements, each requires it's
own jsGraphics instance: </TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=#eeeeee><TT><FONT style="FONT-SIZE: 12px"
size=2><script
type="text/javascript"><BR><!--<BR><BR>var jg =
new jsGraphics("myCanvas");<BR>var jg2 = new
jsGraphics("anotherCanvas");<BR><BR>//--><BR></script>
</FONT></TT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
<TD><BR></TD></TR>
<TR>
<TD> <BR> <BR><B>b) Draw directly into the document while
the page is parsed:</B> <BR>Works even in Netscape 4 and Opera 5/6.
Instead of the ID of a DIV element, nothing (or the value null) must
be passed to the constructor function: </TD>
<TD><BR></TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=#eeeeee><TT><FONT style="FONT-SIZE: 12px"
size=2><script
type="text/javascript"><BR><!--<BR><BR>var jg_doc
= new jsGraphics();<BR><BR>//--><BR></script>
</FONT></TT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
<TD><BR></TD></TR>
<TR>
<TD>Instead of jg, jg2 or jg_doc you may choose any other variable
name, provided it follows the rules for variable names in
JavaScript. </TD>
<TD><BR></TD></TR>
<TR>
<TD><B> <BR> <BR> <BR><BIG>2.</BIG> Functions to Draw
Shapes</B> <BR>Once generated, these graphics objects (in this
expample jg, jg2 and/or jg_doc) can be used to call the Draw Shapes
methods. The shapes generated by a certain graphics object will be
drawn into the concerned html element, or, with mode b) used, into
the document itself: </TD>
<TD><BR></TD></TR>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=0 width="100%" bgColor=#000099
border=0>
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=1 width="100%" border=0>
<TBODY>
<TR>
<TD bgColor=#eeeeee><TT><FONT style="FONT-SIZE: 12px"
size=2><script
type="text/javascript"><BR><!--<BR>function
myDrawFunction()<BR>{<BR>
jg_doc.setColor("#00ff00"); <I><FONT color=#999999>//
green</FONT></I><BR> jg_doc.fillEllipse(100, 200, 100, 180); <I><FONT
color=#999999>// co-ordinates related to the document</FONT></I><BR>
jg_doc.setColor("maroon");<BR>
jg_doc.drawPolyline(new Array(50, 10, 120), new
Array(10, 50, 70));<BR> jg_doc.paint(); <I><FONT
color=#999999>// draws, in this case, directly into the
document</FONT></I><BR><BR>
jg.setColor("#ff0000"); <I><FONT color=#999999>//
red</FONT></I><BR> jg.drawLine(10, 113, 220, 55); <I><FONT
color=#999999>// co-ordinates related to "myCanvas"</FONT></I><BR>
jg.setColor("#0000ff"); <I><FONT color=#999999>//
blue</FONT></I><BR> jg.fillRect(110, 120, 30,
60);<BR> jg.paint();<BR><BR>
jg2.setColor("#0000ff"); <I><FONT color=#999999>//
blue</FONT></I><BR> jg2.drawEllipse(10, 50, 30,
100);<BR> jg2.drawRect(400, 10, 100,
50);<BR> jg2.paint();<BR>}<BR><BR>var
jg_doc = new jsGraphics(); <I><FONT
color=#999999>// draw directly into document</FONT></I><BR>var
jg = new jsGraphics("myCanvas");<BR>var jg2 = new
jsGraphics("anotherCanvas");<BR><BR>myDrawFunction();<BR><BR>//--><BR></script>
</FONT></TT></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD>
<TD><BR></TD></TR>
<TR>
<TD>As illustrated in this example, at first the color of the "pen"
should be set. Otherwise the default color black will be used. The
coordinates passed to the Draw Shapes methods refer either, if mode
b) used, to the left-top corner of the document itself, or to the
left-top corner of the concerned DIV. For each canvas (graphics
object) separately, it's paint() method must be called explicitly to
render the internally-generated graphics html. Otherwise nothing
will happen on your screen. </TD>
<TD><BR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE style="MARGIN: 10px;background-color:gold;border:1px red solid;" cellSpacing=0 cellPadding=0
border=0 id="xdtable-3" >
<TBODY>
<TR>
<TD>
<TABLE cellSpacing=1 cellPadding=8 border=0>
<TBODY>
<TR bgColor=#eeeeee>
<TD><B>Name of function (method)</B></TD>
<TD><B>Code example</B> as to be used with the above example object
'jg' (which is the context of the DIV called "myCanvas")</TD></TR>
<TR bgColor=white>
<TD colSpan=2><B>General Notes</B> <BR> <BR><B>1.)</B> Numbers
passed to these functions must always be <B>integer numbers</B>,
rather than decimal point numbers (floating point numbers),
characters or strings. For instance, values obtained from formular
inputs are always strings, and results from previous JavaScript
calculations typically floating point numbers. Use either the
predefined <TT>parseInt()</TT> or the <TT>Math.round()</TT>
JavaScript function to convert data to integer. Example:
<BR><CODE>jg.setStroke(parseInt(document.MyForm.Linewidth.value));</CODE>
<BR> <BR><B>2.)</B> Consider that co-ordinates lie between
pixels, not on them, and that the drawing "pen" hangs beneath and to
the right of the path specified by co-ordinates passed to the
functions. </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>setColor(</B>"#HexColor"<B>);</B></CODE>
<BR> <BR>Specifies the color of the drawing "pen". Once set,
this color will be used by the subsequently called drawing methods
until it will be overridden through another call of setColor(). The
value must be enclosed in quotation marks, and should be hexadecimal
following the pattern "#rrggbb" (as usual with HTML). Color names
available in HTML (for instance "maroon") may be used as well. </TD>
<TD><CODE>jg.setColor("#ff0000");</CODE><BR> <BR>or with
identical result<BR> <BR><CODE>jg.setColor("red");</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>setStroke(</B>Number<B>);</B></CODE>
<BR> <BR>Specifies the thickness of the drawing "pen" for lines
and bounding lines of shapes. Once set, this thickness will be used
by the subsequently called drawing methods until it will be
overridden through another call of setStroke(). Default line
thickness is 1 px, as long as .setStroke() has not yet been
invoked. <BR> <BR>To create dotted lines, <TT>setStroke()</TT>
requires the constant <TT>Stroke.DOTTED</TT> as argument. Width of
dotted lines is always 1 pixel. </TD>
<TD><CODE>jg.setStroke(3);</CODE> <BR> <BR>or
<BR> <BR><CODE>jg.setStroke(Stroke.DOTTED);</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawLine(</B>X1, Y1, X2, Y2<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setStroke(2);
jg.setColor("#ff6666");
jg.drawLine(0, 11, 40, 0);
jg.htm += '<\/td><\/tr><\/table><\/div>';
//jg.paint();
//-->
</SCRIPT>
Line from the first to the second pair of coordinates. Line
thickness is either 1 px or the value most recently specified
by <B><TT>.setStroke()</TT></B>. </TD>
<TD><CODE>jg.drawLine(20,50,453,40);</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawPolyline(</B>Xpoints, Ypoints<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#55aaaa");
jg.drawPolyLine(new Array(0, 10, 20, 30, 40), new Array(0, 11, 0, 11, 0));
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
A polyline is a series of connected line segments. Xpoints and
Ypoints are arrays which specify the x and y coordinates of each
point as follows: <BR><CODE>var Xpoints = new
Array(x1,x2,x3,x4,x5);<BR>var YPoints = new
Array(y1,y2,y3,y4,y5);</CODE> <BR>Instead of Xpoints and Ypoints you
may of course use other names provided these follow the rules for
JavaScript variable names. <BR> <BR>Line thickness is either
1px or the value most recently specified by
<B><TT>.setStroke()</TT></B>. </TD>
<TD><CODE>var Xpoints = new Array(10,85,93,60);<BR>var YPoints = new
Array(50,10,105,87);<BR>jg.drawPolyline(Xpoints,Ypoints);</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawRect(</B>X, Y, width, height<B>);</B></CODE>
<BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#6666ff");
jg.drawRect(0, 0, 40, 11);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Outline of a rectangle. X and Y give the co-ordinates of the left
top corner. Line thickness is either 1px or the value most recently
specified by <B><TT>.setStroke()</TT></B>. </TD>
<TD><CODE>jg.drawRect(20,50,70,140);</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>fillRect(</B>X, Y, width, height<B>);</B></CODE>
<BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#ffcc66");
jg.fillRect(0, 0, 40, 11);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Filled rectangle. X and Y give the co-ordinates to the left top
corner. </TD>
<TD><CODE>jg.fillRect(20,50,453,40);</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawPolygon(</B>Xpoints, Ypoints<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#cc66cc");
jg.drawPolygon(new Array(0, 20, 40, 20), new Array(5, 0, 5, 11));
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Polygon. Xpoints and Ypoints are arrays which specify the x and y
coordinates of the polygon's corners as follows: <BR><CODE>var
Xpoints = new Array(x1,x2,x3,x4,x5);<BR>var Ypoints = new
Array(y1,y2,y3,y4,y5);</CODE> <BR>The polygon will be automatically
closed if the first and last points are not identical.
<BR> <BR>Line thickness is either 1px or the value most
recently specified by <B><TT>.setStroke()</TT></B>. </TD>
<TD><CODE>var Xpoints = new Array(10,85,93,60);<BR>var Ypoints = new
Array(50,10,105,87);<BR>jg.drawPolygon(Xpoints,
Ypoints);</CODE><BR> <BR>Instead of Xpoints and Ypoints you may
of course use other names provided these follow the rules for
variable names. </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>fillPolygon(</B>Xpoints, Ypoints<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#99ccff");
jg.fillPolygon(new Array(0, 20, 40, 20), new Array(6, -1, 6, 13));
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Filled Polygon. Parameters as for drawPolygon() </TD>
<TD><CODE>jg.fillPolygon(new Array(10,85,93,60),</CODE> <CODE>new
Array(50,10,105,87));</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawEllipse(</B>X, Y, width, height<B>);</B></CODE>
<BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#55bb55");
jg.drawOval(0, -1, 40, 12);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Outline of an ellipse. Values refer to the bounding rectangle of the
ellipse, X and Y give the co-ordinates of the left top corner of
that rectangle rather than of it's center. Line thickness is either
1px or the value most recently specified by
<B><TT>.setStroke()</TT></B>. </TD>
<TD><CODE>jg.drawEllipse(20,50,70,140);</CODE> <BR>or
<BR><CODE>jg.drawOval(20,50,70,140);</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>fillEllipse(</B>X, Y, width, height<B>);</B></CODE>
<BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:50px;height:13px;"><table cellpadding="0" cellspacing="0"><tr><td>';
jg.setColor("#ffccdd");
jg.fillOval(0, -1, 41, 13);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Filled ellipse. Values refer to the bounding rectangle of the
ellipse, X and Y give the co-ordinates of the left top corner of
that rectangle rather than of it's center. </TD>
<TD><CODE>jg.fillEllipse(20,50,71,141);</CODE> <BR>or
<BR><CODE>jg.fillOval(20,50,71,141);</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>setFont(</B>"font-family", "size+unit",
Style<B>);</B></CODE> <BR> <BR>This method can be invoked prior
to drawString() to specify or change font-family, -size and -style.
Values or font-family and -size may be whatever possible in HTML,
and must be enclosed in quotation marks. <BR> <BR>Available
font styles:<BR>Font.PLAIN for normal style (not bold, not
italic)<BR>Font.BOLD for bold fonts<BR>Font.ITALIC for
italics<BR>Font.ITALIC_BOLD or Font.BOLD_ITALIC to combine the
latters. </TD>
<TD>Example: see <CODE>drawString()</CODE> below </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawString(</B>"Text", X, Y<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:400px;height:16px;"><table cellpadding="0" cellspacing="0" width="400"><tr><td>';
jg.setFont("arial,helvetica,sans-serif", "15px", Font.ITALIC_BOLD);
jg.setColor("#cc6600");
jg.drawString("I've been drawn with the Vectorgraphics Library...", 0, 0);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Writes text to the location specified by X and Y. Differently from
Java, these coordinates refer to the left top corner of the first
line of the text. The string passed to drawString() must be enclosed
in quotation marks. (Non-escaped) HTML tags inside the string will
be interpreted. For example,
"Some Text<br>more Text" would indeed create a line
break. </TD>
<TD><CODE>jg.setFont("arial","15px",Font.ITALIC_BOLD);</CODE>
<BR><CODE>jg.drawString("Some Text",20,50);</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawStringRect(</B>"Text", X, Y, Width,
Alignment<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:400px;height:100px;"><table cellpadding="0" cellspacing="0" width="400"><tr><td>';
jg.setFont("verdana,geneva,sans-serif", "11px", Font.BOLD);
jg.setColor("#009999");
jg.drawStringRect("A text drawn by using drawStringRect() which allows to set the width of the text rectangle and to align the text horizontally (in this case "right")", 4, 4, 292, "right");
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Like drawString. Allows however to set the width of the text
rectangle and to specify the horizontal text-alignment.
Text-alignment value must be a string (i.e. enclosed in quotation
marks or apostrophes) and can be either "left", "center", "right" or
"justify". </TD>
<TD><CODE>jg.setFont("verdana","11px",Font.BOLD);</CODE>
<BR><CODE>jg.drawStringRect("Text",20,50,300,"right");</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>drawImage(</B>"src", X, Y, width,
height<B>);</B></CODE> <BR>
<SCRIPT type=text/javascript>
<!--
jg.htm += '<div style="position:relative;width:400px;height:64px;"><table cellpadding="0" cellspacing="0" width="400"><tr><td>';
jg.drawImage("../images/dragdrop/deddie.jpg", 0, 0, 90, 62);
jg.htm += '<\/td><\/tr><\/table><\/div>';
jg.paint();
//-->
</SCRIPT>
Draws image on the specified location. "src" parameter specifies
path, width and height parameters allow to stretch the image
(almost) arbitrarily. <BR> <BR>Optionally, drawImage() accepts
a fifth parameter which you can use to insert an eventhandler into
the generated image tag. Example:
<BR><CODE>jg.drawImage("anImg.jpg",8,5,95,70,"onmouseover=YourFunc()");</CODE>
<BR> <BR></TD>
<TD><CODE>jg.drawImage("friendlyDog.jpg",</CODE>
<CODE>20,50,100,150);</CODE> </TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>paint();</B></CODE> <BR> <BR>Must be envoked
explicitly to draw the internally-generated graphics into the html
page. To optimize performance it's recommended to restrain from
calling <TT>paint()</TT> in unnecessarily short intervals.
<BR> <BR>Avoid something like: <BR><TT>jg.drawEllipse(0, 0,
100, 100); <BR>jg.paint(); <BR>jg.drawLine(200, 10, 400, 40);
<BR>jg.paint(); <BR>...</TT> <BR> <BR>The following will be
faster: <BR><TT>jg.drawEllipse(0, 0, 100, 100); <BR>jg.drawLine(200,
10, 400, 40); <BR>/*...further drawing methods... */
<BR>jg.paint();</TT> </TD>
<TD><CODE>jg.paint();</CODE></TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>clear();</B></CODE> <BR> <BR>Any content created
by the Graphics JavaScript Library will be deleted (within the
canvas the graphics object refers to). The default content of the
canvas (content not created by the script) will remain untouched,
i.e. neither be changed nor be deleted. </TD>
<TD><CODE>jg.clear();</CODE><BR> <BR>Any stuff within
"myCanvas" (in these examples the DIV 'jg' refers to) drawn by the
script is deleted.</TD></TR>
<TR vAlign=top bgColor=white>
<TD><CODE><B>setPrintable(</B>true<B>);</B></CODE> <BR> <BR>By
default, printing shapes isn't feasible since default printing
settings of browsers usually prevent background colors from being
printed. Invoking setPrintable() with the parameter true enables
wz_jsgraphics.js to draw printable shapes (at least in
Mozilla/Netscape 6+ and IE). However, at the price of a
slightly decreased rendering speed (about 10% to 25% slower). </TD>
<TD><CODE>jg.setPrintable(false);</CODE><BR> <BR>The parameter
false switches wz_jsgraphics.js back to non-printable mode. The
benefit from this, however, will be re-optimized rendering
performance. </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<TABLE width="100%" id="xdtable-4" style="background-color:DarkSeaGreen ;border:1px red solid;">
<TBODY>
<TR>
<TD width=80><IMG height=1 alt=""
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=80></TD>
<TD>
<TABLE width="100%" >
<TBODY>
<TR>
<TD><B><A
name=download></A> <BR> <BR> <BR> <BR><BIG>Download</BIG></B>
</TD>
<TD vAlign=top align=right rowSpan=4>
<TABLE cellSpacing=3 cellPadding=0>
<TBODY>
<TR>
<TD width=1 bgColor=#000099><IMG height=1 alt=""
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/transparentpixel.gif"
width=1></TD>
<TD><SMALL> <BR><A
href="#top">Top
of Page</A> <BR> <BR><A
href="#performance">Performance?</A>
<BR> <BR><A
href="#browser">Cross
Browser?</A> <BR> <BR><A
href="#docu">Documentation</A>
<BR> <BR><A
href="#download">Download</A>
<BR> </SMALL></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD vAlign=top>wz_jsgraphics.js 2.32 zipped
5.38 KB (not MB)<BR><A
href="http://www.walterzorn.com/scripts/wz_jsgraphics.zip">wz_jsgraphics.zip</A>
<BR> <BR><A
href="http://www.walterzorn.com/jsgraphics/history_e.htm">History of
Updates</A> (it's recommended to read this, especially if you aren't
sure about the benefits from an update :-) ). </TD></TR>
<TR>
<TD><B><A
name=notes></A><BR> <BR> <BR> <BR> <BR><BIG>Notes</BIG></B>
</TD></TR>
<TR>
<TD><B>[1]</B> <BR>If we assume the probability of line angles on
the screen to be equally distributed over 360? <BR>Then for 1 px
wide lines the number of layers is averagely
<B>sin(45? / (1 - sin(45?) = 2.41</B>
times larger if for each pixel a separate layer is created, compared
with a solution that requires merely one layer per pixel stair-step
(as is the case with this library). This is true under the
assumption that both algorithms let pixel stair-steps touch each
other corner-by-corner rather than side-by-side. Otherwise the
number of pixels to be colored would be larger, and therefore the
disadvantage of an unfavorable one-layer-per-pixel algorithm even
bigger. </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<HR width="95%" noShade SIZE=1>
<TABLE cellPadding=20 id="xdtable-5" style="background-color:DarkKhaki ;border:1px red solid;">
<TBODY>
<TR>
<TD><SMALL><A onmouseover=this.href=Ml() href="javascript:void(0)">Walter
Zorn</A>, Munich, 2005</SMALL>
<BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR> <BR><IMG
alt=""
src="DHTML Draw Line, Ellipse, Oval, Circle, Polyline, Polygon, Triangle with JavaScript.files/cnt.gif">
<SMALL>visitors on www.walterzorn.com since 27. 12. 2002</SMALL>
</TD></TR></TBODY></TABLE>
<SCRIPT type=text/javascript>
<!--
var no_dhtm = (document.layers || window.opera && !document.defaultView);
function ZOOM()
{
if (document.body && document.body.style && typeof document.body.style.zoom != "undefined")
{
if (document.body.style.zoom=="400%")
document.body.style.zoom = "100%";
else
{
document.body.style.zoom = "400%";
// alert('You\'ve doubleclicked on the document.\nDoubleclick again to unzoom.');
}
}
}
//document.ondblclick=ZOOM;
function DRAW(shape)
{
if (jg_n4 || window.opera && !document.defaultView)
{
alert('In Netscape 4 and Opera < version 7, the functionality\n"Draw into a canvas, even after the page has fully loaded" isn\'t available.\nThese browsers can only draw directly into the document\nwhile the page is parsed.');
return;
}
if (window.event) event.cancelBubble = true;
var f=document.forms[0];
var color = ''+f.Color.value;
for (var z = 0; z<color.length; z++)
if (isNaN(parseInt(color.charAt(z), 16)))
color = color.substring(0, z) + '6' + color.substring(z+1);
var t0 = (new Date()).getTime();
jg2.setColor("#"+color);
jg2.setStroke(f.Dotted.checked? Stroke.DOTTED : parseInt(f.Stroke.value));
if (shape=="drawLine()")
jg2.drawLine(parseInt(f.dl_x1.value), parseInt(f.dl_y1.value), parseInt(f.dl_x2.value), parseInt(f.dl_y2.value));
else if (shape=="drawRect()")
jg2.drawRect(parseInt(f.dr_x.value), parseInt(f.dr_y.value), parseInt(f.dr_w.value), parseInt(f.dr_h.value));
else if(shape=="fillRect()")
jg2.fillRect(parseInt(f.fr_x.value), parseInt(f.fr_y.value), parseInt(f.fr_w.value), parseInt(f.fr_h.value));
else if(shape=="drawEllipse()")
jg2.drawEllipse(parseInt(f.do_x.value), parseInt(f.do_y.value), parseInt(f.do_w.value), parseInt(f.do_h.value));
else if(shape=="fillEllipse()")
jg2.fillEllipse(parseInt(f.fo_x.value), parseInt(f.fo_y.value), parseInt(f.fo_w.value), parseInt(f.fo_h.value));
else if(shape=="fillPolygon()")
{
var pgx = f.fp_x.value.split(',');
var pgy = f.fp_y.value.split(',');
var comm = '\n \nNote:\nValues must be separated with commas from each other.';
if (pgx.length!=pgy.length) alert('The number of x und y values must be equal.'+comm);
else
{
for (var z = 0; z<pgx.length; z++)
{
if (isNaN(pgx[z] = parseInt(pgx[z])) || isNaN(pgy[z] = parseInt(pgy[z])))
{
alert('Invalid x or y value.'+comm);
return;
}
}
jg2.fillPolygon(pgx, pgy);
}
}
jg2.paint();
var t1 = (new Date()).getTime() - t0;
jg3.clear();
jg3.setColor('#'+color);
jg3.setFont('verdana,geneva,sans-serif', '12px', Font.BOLD);
jg3.drawString(t1 + ' milliseconds', 0, 10);
jg3.paint();
}
var jg2=new jsGraphics("test");
var jg3 = new jsGraphics("dt");