Pie chart creator for progress bars

2017-11-13 17:51:15 +05:30
parent bffa747662
commit 347d51c3c2
1 changed files with 85 additions and 0 deletions
--- a/pie_chart.py
+++ b/pie_chart.py
@@ -0,0 +1,85 @@
+# Modified from: http://drumcoder.co.uk/blog/2010/nov/16/python-code-generate-svg-pie-chart/
+
+import math
+
+class GeneratePie():
+    def __init__(self, progress_percent):
+        self.progress_percent = int(progress_percent)
+
+    def generate(self):
+        lSlices = (100 - self.progress_percent, self.progress_percent)  # percentages to show in pie
+
+        lOffsetX = 150
+        lOffsetY = 150
+
+        lRadius = 100
+
+        def endpoint(pAngleInRadians, pRadius, pCentreOffsetX, pCentreOffsetY):
+            """
+            Calculate position of point on circle given an angle, a radius,
+            and the location of the center of the circle
+            Zero line points west.
+            """
+            lCosAngle = math.cos(pAngleInRadians)
+            lSinAngle = math.sin(pAngleInRadians)
+            lStartLineDestinationX = pCentreOffsetX - (lRadius * lCosAngle)
+            lStartLineDestinationY = pCentreOffsetY - (lRadius * lSinAngle)
+
+            return (lStartLineDestinationX, lStartLineDestinationY)
+
+
+        GRADIENTS = ('myRadialGradientGreen', 'myRadialGradientOrange',
+                     'myRadialGradientGreen', 'myRadialGradientOrange')
+        DEGREES_IN_CIRCLE = 360.0
+        lSvgPath = ""
+        lCurrentAngle = 0
+        lTotalSlices = 0
+        lIndex = 0
+        lSvgPath = ""
+        for x in lSlices:
+            lTotalSlices += x
+
+        for lSlice in lSlices:
+            lLineOneX, lLineOneY = endpoint(lCurrentAngle, lRadius, lOffsetX, lOffsetY)
+            lLineOne = "M%d,%d L%d,%d" % (lOffsetX, lOffsetY, lLineOneX, lLineOneY)
+
+            lDegrees = (DEGREES_IN_CIRCLE / lTotalSlices) * lSlice
+            lRadians = math.radians(lDegrees)
+            lCurrentAngle += lRadians
+            lLineTwoX, lLineTwoY = endpoint(lCurrentAngle, lRadius, lOffsetX, lOffsetY)
+
+            lRoute = 0
+            if lDegrees > 180:
+                lRoute = 1
+            lArc = "A%d,%d 0 %d,1 %d %d" % (
+                lRadius, lRadius, lRoute, lLineTwoX, lLineTwoY)
+            lLineTwo = "L%d,%d" % (lOffsetX, lOffsetY)
+
+            lPath = "%s %s %s" % (lLineOne, lArc, lLineTwo)
+            lGradient = GRADIENTS[lIndex]
+            lSvgPath += "<path d='%s' style='stroke:#2c2c2c; fill:url(#%s);'/>" % (
+                lPath, lGradient)
+            lIndex += 1
+
+        lSvg = """
+        <svg  xmlns="http://www.w3.org/2000/svg"
+            xmlns:xlink="http://www.w3.org/1999/xlink">
+        <defs>
+            <radialGradient id="myRadialGradientGreen" r="65%%" cx="0" cy="0" spreadMethod="pad">
+            <stop offset="0%%"   stop-color="#2c2c2c" stop-opacity="1"/>
+            <stop offset="100%%" stop-color="#2c2c2c" stop-opacity="1" />
+            </radialGradient>
+        </defs>
+        <defs>
+            <radialGradient id="myRadialGradientOrange" r="65%%" cx="0" cy="0" spreadMethod="pad">
+            <stop offset="0%%"   stop-color="#4caf50" stop-opacity="1"/>
+            <stop offset="100%%" stop-color="#4caf50" stop-opacity="1" />
+            </radialGradient>
+        </defs>
+
+        %s
+        <!--  <circle cx="%d" cy="%d" r="100" style="stroke:#4caf50; fill:none;"/> -->
+        </svg>
+        """ % (lSvgPath, lOffsetX, lOffsetY)
+
+        return lSvg