Question

Problem Description Design and implement a Python called draw.txt a list of 2D graphical instructions and executes them on the created line of the file rogram that creates a drawing window, reads from a text file window. Each represents a graphical instruction consisting of an operation name followed by a list of parameters. For example, the graphical instruction "Line 20 20 170 170" means draw a line from point (20, 20) to point (170. 170 where Line is the operation and 20 20 170 170 are related parameters. Table. 1 describes the list of graphical instructions to inchude in this assignment and Figure. 1 shows a sample of draw.txt Your program should read each instruction. process it to identify the graphical instruction and then execute it if correct or add the line number and an error message to a list of errors (called errorLisn) if there is an eiror in the graphical instruction. At the end. your program should display on the console window, the number of errors found in draw.txt, followed by the line numbers they occur in and related error messages. Table.2 includes the list of eirors to consider, and Figure.2 shows the corresponding outpurs (drawing on the graphical window and error messages on the console window).

Answer 1

from ezgraphics import GraphicsWindow

# Create the graphics window.
win = GraphicsWindow(400, 400)
win.setTitle("Simple Canvas")
canvas = win.canvas()
errorlist = []
count = 0

with open('draw.txt', 'r') as f:
    for line in f:
        count += 1 # counter for lines
        drawinstr = line.rstrip('\n').split(' ') # striping off newline and splitting string based on whitespace
        operator = drawinstr[0]

        if operator.lower() == 'line':
            # Check for number of parameters
            if len(drawinstr) != 5:
                errorlist.append('in line ' + str(count) + ' : Wrong'
                                 + ' number of parameters for oval')
                continue
            # Check for interger parameters
            if not (drawinstr[1].isdigit() and drawinstr[2].isdigit()
            and drawinstr[3].isdigit() and drawinstr[4].isdigit()):
                   errorlist.append('in line ' + str(count) + ' : Wrong '
                                    + 'parameter types')  
                   continue
             
            canvas.drawLine(int(drawinstr[1]), int(drawinstr[2]),
                                 int(drawinstr[3]), int(drawinstr[4]))

        if operator.lower() == 'oval':
            # Check for number of parameters
            if len(drawinstr) != 5:
                errorlist.append('in line ' + str(count) + ' : Wrong'
                                 + ' number of parameters for oval')
                continue
            # Check for interger parameters  
            if not (drawinstr[1].isdigit() and drawinstr[2].isdigit()
            and drawinstr[3].isdigit() and drawinstr[4].isdigit()):
                errorlist.append('in line ' + str(count) + ' : Wrong '
                             'parameter types')
                continue
          
            canvas.drawOval(int(drawinstr[1]), int(drawinstr[2]),
                                 int(drawinstr[3]), int(drawinstr[4]))
          
        if operator.lower() == 'rectangle':
            # Check for number of parameters
            if len(drawinstr) != 5:
                errorlist.append('in line ' + str(count) + ' : Wrong '
                                  'number of parameters for rectangle')
                continue
            # Check for interger parameters
            if not (drawinstr[1].isdigit() and drawinstr[2].isdigit()
            and drawinstr[3].isdigit() and drawinstr[4].isdigit()):
                errorlist.append('in line ' + str(count) + ' : Wrong '
                             'parameter types')     
                continue
          
            canvas.drawRectangle(int(drawinstr[1]), int(drawinstr[2]),
                                 int(drawinstr[3]), int(drawinstr[4]))
          
        if operator.lower() == 'text':
            # Check for number of parameters
            if len(drawinstr) != 5:
                errorlist.append('in line ' + str(count) + ' : Wrong'
                                 + 'number of parameters for text')
                continue
            # Check for interger parameters
            if not (drawinstr[1].isdigit() and drawinstr[2].isdigit()
            and drawinstr[3].isdigit()):
                errorlist.append('in line ' + str(count) + ' : Wrong '
                             'parameter types')
                continue
          
            # Set Text Font Size
            canvas.setTextFont(size = int(drawinstr[3]))
            # Draw text as desired place on canvas
            canvas.drawText(int(drawinstr[1]), int(drawinstr[2]),
                            drawinstr[4])

        if operator.lower() == 'fcolor':
            if len(drawinstr) == 2:
                # Check for color lists for FColor
                if not (drawinstr[1] == 'gray' or drawinstr[1] == 'black'
                        or drawinstr[1] == 'red' or drawinstr[1] == 'green'
                        or drawinstr[1] == 'blue' or drawinstr[1] == 'magenta'):
                    errorlist.append('in line ' + str(count) + ' : Wrong'
                                 + ' color name for OColor')
                    continue
                # Set fill color of drawing object
                canvas.setFill(drawinstr[1])
              
        if operator.lower() == 'ocolor':
            if len(drawinstr) == 2:
                # Check for color lists for OColor
                if not (drawinstr[1] == 'gray' or drawinstr[1] == 'black'
                        or drawinstr[1] == 'red' or drawinstr[1] == 'green'
                        or drawinstr[1] == 'blue' or drawinstr[1] == 'magenta'):
                    errorlist.append('in line ' + str(count) + ' : Wrong'
                                 + ' color name for FColor')
                    continue
                 # Set outline color of drawing object
                canvas.setOutline(drawinstr[1])
      
        # Check for Unknown instruction
        if not (operator.lower() == 'line' or operator.lower() == 'oval' or
        operator.lower() == 'rectangle' or operator.lower() == 'text' or
        operator.lower() == 'fcolor' or operator.lower() == 'ocolor'):
            errorlist.append('in line ' + str(count) + ' : Unknown ' +
                             'instruction')
            continue
      
# Display Errors      
print('There are %d errors'%len(errorlist))
print('List of errors:')
for error in errorlist:
    print(error)
                                  
# Wait for the user to close the window.
win.wait()

------------------------------------------------------------

contents of input file "draw.txt"

FColor gray
Rectangle 20 20 150
Rectangle 20 20 150 150
FColor red
Oval 20 20 150 150
OColor green
Text 60.5 90 16 COMP2101
Text 60 90 16 COMP2101
OColor magenta
Line 170 170 180 180
FColor gray
OColor black
Rectangle 180 180 100 100
FColor blue
Oval 180 180 100 100
OColor red
Text 190 220 14 Homework#3
OColor magenta
Line 280 280 290 290
FColor gray
Circle
OColor black
Rectangle 290 290 50 50
FColor green
Oval 290 290 50 50
FColor color
OColor blue
Text 295 310 12 SP2019

------------------------------------

output

IPython console Simple Canvas Console 1/A × Python 3.7.1 (default, Dec 14 2018, 19:28:38) Type "copyright", "credits" or "license" for more information. IPython 7.2.θ .. An enhanced Interactive Python . COMP2101 In [1]: runfile(/home/kb/Desktop/chg/python/barchart1.py,wdir-' home/kb/Desktop/chg/python') There are 4 errors List of errors in line 2: Wrong number of parameters for rectangle in line 7:Wrong parameter types in line 21 Unknown instruction in line 26Wrong color name for 0Color #3 History log IPython console