Migrate code from Piddle to Pillow

* wqflask/wqflask/marker_regression/display_mapping_results.py: Add font files
(DisplayMappingResults): Update the code from the Piddle way of things to the
Pillow way of things, for example, replace:
- pid.drawRect(...) with im_drawer.rectangle(...)
- pid.drawString(...) with im_drawer.text(...)
- pid.drawPolygon(...) with im_drawer.polygon(...) etc.
* wqflask/utility/Plot.py: Migrate code from the older, unsupported Piddle to
the newer Pillow library.

1 files changed, 64 insertions, 23 deletions

diff --git a/wqflask/utility/Plot.py b/wqflask/utility/Plot.py
index 9bc84d22..c557bcc6 100644
--- a/wqflask/utility/Plot.py
+++ b/wqflask/utility/Plot.py
@@ -26,7 +26,7 @@
 
 from __future__ import print_function
 
-import piddle as pid
+from PIL import (Image, ImageColor, ImageDraw, ImageFont)
 from pprint import pformat as pf
 
 from math import *
@@ -42,6 +42,17 @@ from base import webqtlConfig
 import utility.logger
 logger = utility.logger.getLogger(__name__ )
 
+# ---- Define common colours ---- #
+BLUE = ImageColor.getrgb("blue")
+BLACK = ImageColor.getrgb("black")
+# ---- END: Define common colours ---- #
+
+# ---- FONT FILES ---- #
+VERDANA_FILE = "fonts/ttf/verdana.ttf"
+COUR_FILE = "fonts/ttf/courbd.ttf"
+TAHOMA_FILE = "fonts/ttf/tahoma.ttf"
+# ---- END: FONT FILES ---- #
+
 def cformat(d, rank=0):
     'custom string format'
     strD = "%2.6f" % d
@@ -114,7 +125,8 @@ def find_outliers(vals):
 
 # parameter: data is either object returned by reaper permutation function (called by MarkerRegressionPage.py)
 # or the first object returned by direct (pair-scan) permu function (called by DirectPlotPage.py)
-def plotBar(canvas, data, barColor=pid.blue, axesColor=pid.black, labelColor=pid.black, XLabel=None, YLabel=None, title=None, offset= (60, 20, 40, 40), zoom = 1):
+def plotBar(canvas, data, barColor=BLUE, axesColor=BLACK, labelColor=BLACK, XLabel=None, YLabel=None, title=None, offset= (60, 20, 40, 40), zoom = 1):
+    im_drawer = ImageDraw.Draw(canvas)
     xLeftOffset, xRightOffset, yTopOffset, yBottomOffset = offset
 
     plotWidth = canvas.size[0] - xLeftOffset - xRightOffset
@@ -161,43 +173,67 @@ def plotBar(canvas, data, barColor=pid.blue, axesColor=pid.black, labelColor=pid
        if count:
            xc = (dataXY[i]-xLow)*xScale+xLeftOffset
            yc =-(count-yLow)*yScale+yTopOffset+plotHeight
-           canvas.drawRect(xc+2,yc,xc+barWidth-2,yTopOffset+plotHeight,edgeColor=barColor,fillColor=barColor)
+           im_drawer.rectangle(
+               xy=((xc+2,yc),(xc+barWidth-2,yTopOffset+plotHeight)),
+               outline=barColor, fill=barColor)
 
     #draw drawing region
-    canvas.drawRect(xLeftOffset, yTopOffset, xLeftOffset+plotWidth, yTopOffset+plotHeight)
+    im_drawer.rectangle(
+        xy=((xLeftOffset, yTopOffset), (xLeftOffset+plotWidth, yTopOffset+plotHeight))
+    )
 
     #draw scale
-    scaleFont=pid.Font(ttf="cour",size=11,bold=1)
+    scaleFont=ImageFont.truetype(font=COUR_FILE,size=11)
     x=xLow
     for i in range(int(stepX)+1):
        xc=xLeftOffset+(x-xLow)*xScale
-       canvas.drawLine(xc,yTopOffset+plotHeight,xc,yTopOffset+plotHeight+5, color=axesColor)
+       im_drawer.line(
+           xy=((xc,yTopOffset+plotHeight),(xc,yTopOffset+plotHeight+5)),
+           fill=axesColor)
        strX = cformat(d=x, rank=0)
-       canvas.drawString(strX,xc-canvas.stringWidth(strX,font=scaleFont)/2,yTopOffset+plotHeight+14,font=scaleFont)
+       im_drawer.text(
+           text=strX,
+           xy=(xc-im_drawer.textsize(strX,font=scaleFont)[0]/2,
+               yTopOffset+plotHeight+14),font=scaleFont)
        x+= (xTop - xLow)/stepX
 
     y=yLow
     for i in range(int(stepY)+1):
        yc=yTopOffset+plotHeight-(y-yLow)*yScale
-       canvas.drawLine(xLeftOffset,yc,xLeftOffset-5,yc, color=axesColor)
+       im_drawer.line(xy=((xLeftOffset,yc),(xLeftOffset-5,yc)), fill=axesColor)
        strY = "%d" %y
-       canvas.drawString(strY,xLeftOffset-canvas.stringWidth(strY,font=scaleFont)-6,yc+5,font=scaleFont)
+       im_drawer.text(
+           text=strY,
+           xy=(xLeftOffset-im_drawer.textsize(strY,font=scaleFont)[0]-6,yc+5),
+           font=scaleFont)
        y+= (yTop - yLow)/stepY
 
     #draw label
-    labelFont=pid.Font(ttf="tahoma",size=17,bold=0)
+    labelFont=ImageFont.truetype(font=TAHOMA_FILE,size=17)
     if XLabel:
-       canvas.drawString(XLabel,xLeftOffset+(plotWidth-canvas.stringWidth(XLabel,font=labelFont))/2.0,
-               yTopOffset+plotHeight+yBottomOffset-10,font=labelFont,color=labelColor)
+       im_drawer.text(
+           text=XLabel,
+           xy=(xLeftOffset+(
+               plotWidth-im_drawer.textsize(XLabel,font=labelFont)[0])/2.0,
+               yTopOffset+plotHeight+yBottomOffset-10),
+           font=labelFont,fill=labelColor)
 
     if YLabel:
-       canvas.drawString(YLabel, 19, yTopOffset+plotHeight-(plotHeight-canvas.stringWidth(YLabel,font=labelFont))/2.0,
-               font=labelFont,color=labelColor,angle=90)
-
-    labelFont=pid.Font(ttf="verdana",size=16,bold=0)
+       im_drawer.text(
+           text=YLabel,
+           xy=(19,
+               yTopOffset+plotHeight-(plotHeight-im_drawer.textsize(
+                   YLabel,font=labelFont)[0])/2.0),
+           font=labelFont,fill=labelColor,angle=90)
+
+    labelFont=ImageFont.truetype(font=VERDANA_FILE,size=16)
     if title:
-       canvas.drawString(title,xLeftOffset+(plotWidth-canvas.stringWidth(title,font=labelFont))/2.0,
-               20,font=labelFont,color=labelColor)
+       im_drawer.text(
+           text=title,
+           xy=(xLeftOffset+(plotWidth-im_drawer.textsize(
+               title,font=labelFont)[0])/2.0,
+               20),
+           font=labelFont,fill=labelColor)
 
 # This function determines the scale of the plot
 def detScaleOld(min,max):
@@ -265,16 +301,21 @@ def greenfunc(x):
 def colorSpectrum(n=100):
     multiple = 10
     if n == 1:
-        return [pid.Color(1,0,0)]
+        return [ImageColor.getrgb("rgb(100%,0%,0%)")]
     elif n == 2:
-        return [pid.Color(1,0,0),pid.Color(0,0,1)]
+        return [ImageColor.getrgb("100%,0%,0%)"),
+                ImageColor.getrgb("rgb(0%,0%,100%)")]
     elif n == 3:
-        return [pid.Color(1,0,0),pid.Color(0,1,0),pid.Color(0,0,1)]
+        return [ImageColor.getrgb("rgb(100%,0%,0%)"),
+                ImageColor.getrgb("rgb(0%,100%,0%)"),
+                ImageColor.getrgb("rgb(0%,0%,100%)")]
     N = n*multiple
     out = [None]*N;
     for i in range(N):
         x = float(i)/N
-        out[i] = pid.Color(redfunc(x), greenfunc(x), bluefunc(x));
+        out[i] = ImageColor.getrgb("rgb({}%,{}%,{}%".format(
+            *[int(i*100) for i in (
+                redfunc(x), greenfunc(x), bluefunc(x))]))
     out2 = [out[0]]
     step = N/float(n-1)
     j = 0
@@ -290,4 +331,4 @@ def _test():
 
 
 if __name__=="__main__":
-    _test()
\ No newline at end of file
+    _test()