Graphing

[IW]

I am looking at developing a small app, which will show financial returns
in a barchart. I have no problem in getting to draw a positive figure (i.e.
a bar chart going up) but am unable to get a bar chart to draw a negative
figure.

Are there pointers, I should be looking at????

TIA

[VK]

IW wrote:

I am looking at developing a small app, which will show financial returns
in a barchart. I have no problem in getting to draw a positive figure (i.e.
a bar chart going up) but am unable to get a bar chart to draw a negative
figure.
Your program possessed by a hard neck business man spirit! :-)
Are there pointers, I should be looking at????

Yeh... How about:

<http://www.google.com/search?hl=en&q=javascript+barchart>

[Randy Webb]

IW said the following on 11/1/2005 12:14 PM:

I am looking at developing a small app, which will show financial returns
in a barchart. I have no problem in getting to draw a positive figure (i.e.
a bar chart going up) but am unable to get a bar chart to draw a negative
figure.

Are there pointers, I should be looking at????

Aside from the google search that was provided, you move your 0 line
either down or up in the container, then you go positive or negative
based on the zero line. Usually the best Zero Line is the center of the
container.

But, post a URL (or if the code is short, the code) to your efforts so far.

--
Randy
comp.lang.javascript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices -
http://www.mattkruse.com/javascript/bestpractices/

[Dr John Stockton]

JRS: In article <43********@news.star.co.uk>, dated Tue, 1 Nov 2005
17:14:02, seen in news:comp.lang.javascript, IW <[e-mail]> posted :

I am looking at developing a small app, which will show financial returns
in a barchart. I have no problem in getting to draw a positive figure (i.e.
a bar chart going up) but am unable to get a bar chart to draw a negative
figure.

Even on older browsers, you should be able to predefine top and left,
and draw a given depth and width. Fill a box with mountain colour, draw
boxes (position:absolute; width:constant; depth:variable) downwards in
sky colour, then draw (position:absolute) the sea level line.
UNTESTED.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 MIME. ©
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.

[Dr John Stockton]

JRS: In article <Mj**************@merlyn.demon.co.uk>, dated Wed, 2 Nov
2005 13:27:53, seen in news:comp.lang.javascript, Dr John Stockton
<jr*@merlyn.demon.co.uk> posted :

JRS: In article <43********@news.star.co.uk>, dated Tue, 1 Nov 2005
17:14:02, seen in news:comp.lang.javascript, IW <[e-mail]> posted :

I am looking at developing a small app, which will show financial returns
in a barchart. I have no problem in getting to draw a positive figure (i.e.
a bar chart going up) but am unable to get a bar chart to draw a negative
figure.

Even on older browsers, you should be able to predefine top and left,
and draw a given depth and width. Fill a box with mountain colour, draw
boxes (position:absolute; width:constant; depth:variable) downwards in
sky colour, then draw (position:absolute) the sea level line.
UNTESTED.

TESTING very crudely in
<URL:http://www.merlyn.demon.co.uk/js-tests.htm#BC>
Array A is bar-charted on pressing "??".

I may improve it tomorrow.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.com/faq/> JL/RC: FAQ of news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[RobG]

Dr John Stockton wrote:
[...]

TESTING very crudely in
<URL:http://www.merlyn.demon.co.uk/js-tests.htm#BC>
Array A is bar-charted on pressing "??".

I may improve it tomorrow.

Can you add units to the style attributes for height, width, etc.?
...left:' + 20*(J+1) +'px; height:' + (200-20*A[J]) + 'px; width:20px"

--
Rob

[Dr John Stockton]

JRS: In article <Rz******************@news.optus.net.au>, dated Thu, 3
Nov 2005 03:35:13, seen in news:comp.lang.javascript, RobG
<rg***@iinet.net.au> posted :

Dr John Stockton wrote:
[...]

TESTING very crudely in
<URL:http://www.merlyn.demon.co.uk/js-tests.htm#BC>
Array A is bar-charted on pressing "??".

I may improve it tomorrow.

Can you add units to the style attributes for height, width, etc.?

...left:' + 20*(J+1) +'px; height:' + (200-20*A[J]) + 'px; width:20px"

Easily done, though that line has changed and the whole thing is
somewhat better now. It needs more work on scaling; and I can probably
now grow bars up rather than anti-bars down. But the principle is
established.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.com/faq/> JL/RC: FAQ of news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

[Dr John Stockton]

JRS: In article <kP**************@merlyn.demon.co.uk>, dated Thu, 3 Nov
2005 21:15:37, seen in news:comp.lang.javascript, Dr John Stockton
<jr*@merlyn.demon.co.uk> posted :

JRS: In article <Rz******************@news.optus.net.au>, dated Thu, 3
Nov 2005 03:35:13, seen in news:comp.lang.javascript, RobG
<rg***@iinet.net.au> posted :

Dr John Stockton wrote:
[...]

TESTING very crudely in
<URL:http://www.merlyn.demon.co.uk/js-tests.htm#BC>
Array A is bar-charted on pressing "??".

I may improve it tomorrow.

Can you add units to the style attributes for height, width, etc.?

...left:' + 20*(J+1) +'px; height:' + (200-20*A[J]) + 'px; width:20px"

Easily done, though that line has changed and the whole thing is
somewhat better now. It needs more work on scaling; and I can probably
now grow bars up rather than anti-bars down. But the principle is
established.

Or established for IE4. I looked at it in IE6 today and was greatly
disappointed. There's a snapshot of the best IE4 output at
<URL:http://www.merlyn.demon.co.uk/barchart.gif> (8.5K), with one
colour wrong (my Paint seems to have its paint-pots muddled). The lines
are zero and mean.

--
© John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.com/faq/> JL/RC: FAQ of news:comp.lang.javascript
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.