Add line plot

Author: ruivieira

docs/README.md

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+# examples
+
+## plot types
+
+### line, scatter with defaults
+
+```nim
+let figure = newFigure()
+figure.add newLinePlot[int,float](@[1, 2, 3, 4], @[5.5, 7.6, 11.1, 6.5])
+figure.save("docs/lineplot_default.png")
+```
+
+![plot](lineplot_default.png)

docs/examples.nim

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+import "../src/matplotnim"
+
+let figure = newFigure()
+figure.add newLinePlot[int,float](@[1, 2, 3, 4], @[5.5, 7.6, 11.1, 6.5])
+figure.save("docs/lineplot_default.png")

docs/lineplot_default.png

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+# Package
+
+version       = "0.1.0"
+author        = "Rui  Vieira"
+description   = "A Nim wrapper for Python\'s matplotlib"
+license       = "Apache-2.0"
+srcDir        = "src"
+
+
+# Dependencies
+
+requires "nim >= 0.19.4"
+require "tempfile"

matplotnim.nimble

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+import strutils
+import sequtils
+import strformat
+import tempfile
+import os
+
+type Plot = ref object of RootObj
+method render(this: Plot): string {.base.} = ""
+
+type 
+  Figure = ref object of RootObj
+    python*: string
+    script*: seq[string]
+    latex*: bool
+    plots*: seq[Plot]
+
+proc save*(figure: Figure, dest: string) =
+  var script = newSeq[string]()
+  script.add "import matplotlib"
+  script.add "matplotlib.use('Agg')"
+  script.add "from matplotlib import rc"
+  script.add "import matplotlib.pyplot as plt"
+  script.add "from matplotlib.lines import Line2D"
+  # script.add "rc('font', **{'family': '#{@font.family}', 'serif': '#{@font.styles.to_s}'})"
+  let latex_str = if figure.latex: "True" else: "False"
+  script.add fmt"rc('text', usetex={latex_str})"
+  script.add "matplotlib.rcParams['text.latex.unicode']=True"
+  for p in figure.plots:
+    script.add p.render
+  script.add fmt"plt.savefig('{dest}', format='png', transparent=False)"
+  let script_str = script.join("\n")
+  # get the temporary file
+  var (file, name) = mkstemp(suffix = ".py")
+  writeFile(name, script_str)
+  echo name
+  discard execShellCmd fmt"/usr/local/bin/python3 {name}"
+
+
+  
+proc newFigure*(): Figure =
+  Figure(python: "/usr/local/bin/python3", script: newSeq[string](), latex: false)
+
+proc add*(figure: Figure, plot: Plot) =
+  figure.plots.add plot
+
+type LinePlot[A, B] = ref object of Plot
+  linestyle*: string
+  x*: seq[A]
+  y*: seq[B]
+method render[A,B](this: LinePlot[A,B]): string =
+  let xs = this.x.map(proc(k:A):string = $k).join(",")
+  let ys = this.y.map(proc(k:B):string = $k).join(",")
+  return fmt"plt.plot([{xs}],[{ys}])"
+
+proc newLinePlot*[A,B](x: seq[A], y: seq[B]): LinePlot[A, B] =
+  LinePlot[A, B](linestyle: "-", x: x, y: y)