- Allow interval charts to compose w/other charts that render-charts() takes

[ds26gte]

486

• chart-lib.js: Have plot() recognize and process interval charts, instead of having separate intervalChart()
• chart.arr: Rewrite render-charts() to accept interval-chart-series. For this, make interval-chart-series closer in properties to function/line/scatter series. interval-chart-from-list() now must keep track of the largest y's (including offset) so render-charts() can create a better bounding box. render-chart() no longer needs to do anything special with interval-charts, passing them on to render-charts()

[schanzer]

@ds26gte Here's the sample program I'm using to test, which combines a scatter plot and an interval chart:

include chart

xs = [list: 1,-2,9,4]
ys = [list: 1,2,3,4]
fn = lam(x): x end
residuals = map2(
  lam(y, prediction): y - prediction end, 
  ys, 
  map(fn, xs))

scatter = from-list.scatter-plot(xs, ys)
fn-plot = from-list.function-plot(fn)
intervals = from-list.interval-chart(xs, ys, residuals)

render-charts([list: scatter, fn-plot, intervals])
  .display()

With this PR, I get the following error:

[jpolitz]

Is this at a point where it should be good to review + go or still in progress?

[schanzer]

@jpolitz good to go! Ready for final review and merger

[jpolitz]

@ds26gte @schanzer I think for this go ahead and push directly to horizon so you can get the testing and autodeploy. Might make testing cycles faster! I won't release till you say it's ready.

[ds26gte]

@schanzer brought up a new test case which I'll investigate and then let you know after if it's ready to go.