is it possible to have discontinuous line graphs?

[jessicah]

I'd like to use the line graphing for a sports tracker type web app, and when a workout has a break in it (e.g. paused at one spot, and resumed at another), i would like to represent the break as a discontinuity in the line graph, e.g. the two endpoints on either side of the 'break' as open circles joined by a straight dashed line, whereas the normal continuous line would be solid.

[davidsonff]

I am also wondering this... Frequently when graphing data it is useful to have a gap when data is not present. Right now I am looking at modifying the graphael source to see if I can change some of the path "L"s to "M"s, but it seems like a useful thing to add...

[davidsonff]

I changed line 193 of g.line.js to:

                path = path.concat([(j && (valuesy[i][j] !== null)) ? "L" : "M", X, Y]);

... and I'm testing it now.... If passed a null y value it skips that point (so far!)...

[davidsonff]

Changed it again to account for null x values:

                path = path.concat([(j && (valuesy[i][j] !== null) && ((valuesx[i] || valuesx[0])[j] !== null)) ? "L" : "M", X, Y]);

[davidsonff]

g.line.js v. 0.51 that is... Sorry to be leaving so many comments...

[Fiendfyre]

Line 193 should be this, so the line graph won't start from a y-datapoint which is null
path = path.concat([(j && (valuesy[i][j] !== null && valuesy[i][j-1] !== null))? "L" : "M", X, Y]);

Adding if(valuesy[i][j] !=null) around this line :
(Raphael.is(sym, "array") ? sym[j] : sym) && symset.push(paper[Raphael.is(sym, "array") ? sym[j] : sym](X, Y, (opts.width || 2) * 3).attr({ fill: colors[i], stroke: "none" })); would prevent symbol being created for y - datapoint with null

correct me, if i'm wrong