Drawing a graph by script

[Mark Swindell]

Thanks  Bjornke, Victoras, and Craig.  I've got something that works  
now.  This is the method I used.  There is a preexisting rectangle  
called "backRect" and a user field called "numUnits".    This seems to  
work pretty well so far.

Mark

ON makeLines

     put field "numUnits" into vNumUnits -- how many lines (units)  
high derived from user input field
     lock screen

     put round((the height of grc "backRect")/(vNumUnits)) into  
vBackIncrement -- how much space between lines, must be rounded  
because pixels are whole numbers

     put "x,x,x,x" into vThePoints -- starting point for first line
     put item 4 of the rect of graphic "backRect" into item 2 of  
vThePoints -- bottom of rectangle = (top of first line)
     put item 4 of the rect of graphic "backRect" into item 4 of  
vThePoints -- bottom of rectangle = (bottom of first line)
     put item 1 of the rect of graphic "backRect" into item 1 of  
vThePoints -- left side of line matches left side of rect
     put item 3 of the rect of graphic "backRect" into item 3 of  
vThePoints -- right side of line matches right side of rect

     REPEAT (vNumUnits-1) times -- so top of rectangle will represent  
last line
         subtract vBackIncrement from item 2 of vThePoints -- each  
line draws itself higher, from bottom up
         subtract vBackIncrement from item 4 of vThePoints -- "  "   "
         set the style of the templategraphic to "line" -- defines  
graphic type
         set the points of the templategraphic to vThePoints --  
defines graphic location
         create graphic "myLine" -- creates line and places at correct  
location
     END repeat

     set the height of grc "backRect" to (the bottom of grc  
"backRect") - (item 4 of vThePoints)+vBackIncrement -- because spaces  
between lines may need to be rounded,  rectangle itself needs to be  
tweaked
     set the top of grc "backRect" to (item 4 of vThePoints) -  
vBackIncrement -- adjusts the rectangle up so all increments are even

     unlock screen
reset the templateGraphic	
END makeLines


On Mar 1, 2009, at 3:44 AM, Björnke von Gierke wrote:

> The easiest way would be to buy malte's new chart engine (available  
> on the rev site).
>
> If you're more interested in the learning experience, i suggest  
> setting the points of a graphic. if you have an empty line in the  
> points of a graphic, the two points above and below it won't be  
> connected, so you can even make the grid and the actual graph from  
> the same graphic. It's very easy to scale this to several heights:  
> Just use a very large rect as orignal, then shrink to your desired  
> size.
>
> On the other hand, if you set the markers, you'll get graph markers  
> for free, so to say. But then you can't use the same graphic for  
> everything at once.
>
> On 28 Feb 2009, at 21:13, Mark Swindell wrote:
>
>> What would be the best way to draw a simple graph by script?
>>
>> All I need is a rectangle with horizontal lines drawn across it at  
>> the correct intervals (height/100) or whatever the number of lines  
>> is to be.  I've been looking in the docs but still not sure how to  
>> implement this.   I also played around with using a list field and  
>> setting the line height, but this isn't as accurate as I'd like.
>
> -- 
>
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>
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