from django.db import models
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from exam.models import Exam, GeneratedPaper
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from datetime import datetime
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# Create your models here.
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import numpy as np
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class Scan(models.Model):
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exam=models.ForeignKey(Exam, on_delete=models.CASCADE)
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paper=models.ForeignKey(GeneratedPaper, on_delete=models.CASCADE)
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page_no=models.IntegerField(default=1)
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student_id=models.CharField(max_length=18, null=True, default=None, blank=True)
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scan_date=models.DateTimeField(default=datetime.now)
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answer_matrix=models.TextField(null=True, default='[]', blank=True)
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coordinates=models.TextField(null=True, default=None, blank=True)
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ocr_debug=models.TextField(null=True, default=None, blank=True)
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grade=models.FloatField(default=-1)
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percentage=models.FloatField(default=-1)
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scan_image=models.ImageField(upload_to='scans/', blank=True)
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def wrong_correct_matrices(self):
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try:
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all_pages=Scan.objects.all().filter(paper=self.paper).order_by('page_no')
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except:
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return None, None, None
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if type(self.paper.answer_matrix)==type(""):
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cmatrix=eval(self.paper.answer_matrix)
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else:
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cmatrix=self.paper.answer_matrix
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amatrix=[]
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curr_page=1
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for p in all_pages:
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if(p.page_no!=curr_page): #check if the page number is correct. If not return None matrices
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return None, None, None
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curr_page+=1
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if type(p.answer_matrix)==type(""):
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page_amatrix=eval(p.answer_matrix)
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else:
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page_amatrix=eval(p.answer_matrix)
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amatrix=amatrix+page_amatrix
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correct=(np.array(cmatrix)=='1')*1
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answers=(np.zeros(np.shape(correct))==0)*0
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for i,row in enumerate(amatrix):
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for j, col in enumerate(row):
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answers[i][j]=col
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#print(correct, answers)
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c=correct&answers
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w=answers&~correct
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return c,w,correct
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def grade(self):
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c,w,correct=self.wrong_correct_matrices()
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if(c is None):
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return -1000, -1000
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grad_positive=np.sum(c*self.exam.mark_positive)
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grad_negative=np.sum(w*self.exam.mark_negative)
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for kv in range(0, self.exam.kvizek):
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if(grad_negative!=0):
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grad_negative-=self.exam.mark_negative
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sum_grading=float(grad_positive+grad_negative)
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grading_percent=np.ceil(sum_grading/(len(correct)*self.exam.mark_positive)*100)
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return grading_percent, sum_grading
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def __str__(self):
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return "{} {} {} {}".format(self.exam, self.paper, self.page_no, self.student_id)
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class ProblemReport(models.Model):
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scan=models.ForeignKey(Scan, on_delete=models.CASCADE)
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message=models.TextField(null=True, blank=True)
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date=models.DateTimeField(default=datetime.now)
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def __str__(self):
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return "{}". format(self.message)
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