From b4b5157490c15311c02ceae025c53f13084beebf Mon Sep 17 00:00:00 2001
From: Mohammad S Anwar <mohammad.anwar@yahoo.com>
Date: Tue, 17 May 2022 22:29:15 +0100
Subject: - Added guest contributions by Eric Cheung.

---
 challenge-165/eric-cheung/python/ch-1.py | 30 +++++++++++++++++++++
 challenge-165/eric-cheung/python/ch-2.py | 45 ++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100755 challenge-165/eric-cheung/python/ch-1.py
 create mode 100755 challenge-165/eric-cheung/python/ch-2.py

diff --git a/challenge-165/eric-cheung/python/ch-1.py b/challenge-165/eric-cheung/python/ch-1.py
new file mode 100755
index 0000000000..153c2273e7
--- /dev/null
+++ b/challenge-165/eric-cheung/python/ch-1.py
@@ -0,0 +1,30 @@
+
+import os
+
+strOuputHTMLFile = "OutputSVG.html"
+
+if os.path.exists(strOuputHTMLFile):
+    os.remove(strOuputHTMLFile)
+
+os.system("echo ^<html^> >> " + strOuputHTMLFile)
+os.system("echo ^<body^> >> " + strOuputHTMLFile)
+
+os.system("echo ^<svg height = \"100\" width = \"100\"^> >> " + strOuputHTMLFile)
+
+while True:
+    objPoints = input("Input: ")
+
+    if not objPoints:
+        break
+
+    arrPoints = objPoints.split(",")
+    ## print (len(arrPoints))
+
+    if len(arrPoints) == 2:
+        os.system("echo ^<circle cx = " + "\"" + arrPoints[0] + "\" cy = \"" + arrPoints[1] + "\" r = \"4\" stroke = \"white\" stroke-width = \"1\" fill = \"red\" /^> >> " + strOuputHTMLFile)
+    elif len(arrPoints) == 4:
+        os.system("echo ^<line x1 = " + "\"" + arrPoints[0] + "\" y1 = \"" + arrPoints[1] + "\" x2 = \"" + arrPoints[2] + "\" y2 = \"" + arrPoints[3] + "\" style = \"stroke: rgb(0, 0, 255); stroke-width: 2\" /^> >> " + strOuputHTMLFile)
+
+os.system("echo ^</svg^> >> " + strOuputHTMLFile)
+os.system("echo ^</body^> >> " + strOuputHTMLFile)
+os.system("echo ^</html^> >> " + strOuputHTMLFile)
diff --git a/challenge-165/eric-cheung/python/ch-2.py b/challenge-165/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..5cb4b0ea51
--- /dev/null
+++ b/challenge-165/eric-cheung/python/ch-2.py
@@ -0,0 +1,45 @@
+
+import os
+
+strOuputHTMLFile = "OutputLineBestFit.html"
+
+arrX_Points = [333, 39, 140, 292, 393, 160, 362, 13, 341, 320, 109, 203, 343, 225, 23, 282, 284, 205, 297, 292, 339, 327, 253, 61, 128, 346, 316, 124, 65, 159, 212, 337, 215, 153, 390, 100, 76, 77, 69, 92, 275, 250, 34, 213, 186, 189, 361, 363]
+
+arrY_Points = [129, 189, 156, 134, 52, 166, 122, 193, 104, 113, 177, 152, 100, 110, 186, 102, 98, 133, 114, 126, 112, 79, 136, 169, 176, 72, 103, 162, 181, 137, 116, 86, 136, 137, 104, 180, 188, 181, 195, 186, 96, 147, 174, 134, 129, 154, 82, 89]
+
+nNumElem = len(arrX_Points)
+nSumX = sum(arrX_Points)
+nSumY = sum(arrY_Points)
+nSumXX = sum([xElem * xElem for xElem in arrX_Points])
+nSumXY = sum([xElem * yElem for xElem, yElem in zip(arrX_Points, arrY_Points)])
+
+dBestFitSlope = (nNumElem * nSumXY - nSumX * nSumY) / (nNumElem * nSumXX - nSumX * nSumX)
+dBestFitIntercept = (nSumY - dBestFitSlope * nSumX) / nNumElem
+
+nBestFit_X_01 = min(arrX_Points)
+nBestFit_Y_01 = int(dBestFitSlope * nBestFit_X_01 + dBestFitIntercept)
+
+nBestFit_X_02 = max(arrX_Points)
+nBestFit_Y_02 = int(dBestFitSlope * nBestFit_X_02 + dBestFitIntercept)
+
+## print (dBestFitSlope)
+## print (dBestFitIntercept)
+
+if os.path.exists(strOuputHTMLFile):
+    os.remove(strOuputHTMLFile)
+
+os.system("echo ^<html^> >> " + strOuputHTMLFile)
+os.system("echo ^<body^> >> " + strOuputHTMLFile)
+
+os.system("echo ^<svg height = \"400\" width = \"400\"^> >> " + strOuputHTMLFile)
+
+## All Points
+for indx in range(0, nNumElem):
+    os.system("echo ^<circle cx = " + "\"" + str(arrX_Points[indx]) + "\" cy = \"" + str(arrY_Points[indx]) + "\" r = \"4\" stroke = \"white\" stroke-width = \"1\" fill = \"red\" /^> >> " + strOuputHTMLFile)
+
+## Best Fit Line
+os.system("echo ^<line x1 = " + "\"" + str(nBestFit_X_01) + "\" y1 = \"" + str(nBestFit_Y_01) + "\" x2 = \"" + str(nBestFit_X_02) + "\" y2 = \"" + str(nBestFit_Y_02) + "\" style = \"stroke: rgb(0, 0, 255); stroke-width: 2\" /^> >> " + strOuputHTMLFile)
+
+os.system("echo ^</svg^> >> " + strOuputHTMLFile)
+os.system("echo ^</body^> >> " + strOuputHTMLFile)
+os.system("echo ^</html^> >> " + strOuputHTMLFile)
-- 
cgit