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line.opa
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line.opa
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/*
Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @author Adam Koprowski
**/
type WLineChart.config = {
bg_style : Canvas.style
line_stroke_style : Canvas.style
margin_px : int
}
WLineChart = {{
default_config : WLineChart.config =
{ line_stroke_style = {color = Color.black}
; bg_style = {color = Color.black}
; margin_px = 3
}
// @private
draw(config, data, canvas, w, h) =
if List.is_empty(data.data)
then {success}
else
fl = Float.of_int
px = Int.of_float
margin = fl(config.margin_px)
n = WChartData.length(data)
fx = WChartData.generate_scaler((0., fl(n-1)), (margin, fl(w) - margin))
fy = WChartData.generate_scaler(WChartData.get_min_max(data),
(margin, fl(h) - margin))
posx(i) = fl(i) |> fx |> px
posy(v) = h - (fy(v) |> px)
draw(i, v) = Canvas.line_to(canvas, posx(i + 1), posy(v))
do Canvas.set_stroke_style(canvas, config.line_stroke_style)
do Canvas.begin_path(canvas)
do match data.data with
| [] -> void
| [v | vs] ->
do Canvas.move_to(canvas, posx(0), posy(v))
do List.iteri(draw, vs)
void
do Canvas.stroke(canvas)
{success}
}}