CSC 240: Midterm Grading Rubric

Part 1: (20pts)

20 - completely correct solution for any two points, satisfies (a) and (b)
17 - too many points in some cases, usually used Euclidean distance between lines, (b) fails
12 - made number of points a very large constant, which causes gaps if line is very long, (a) fails,
     usually (b) also fails
10 - right idea of Bezier lines
 5 - non-parametric correct line algorithm

Part 2: (10pts)

(a) 3 - correct sub square filled, 2 - incorrect sub square filled
(b) 3 - correct call to flood_fill2, 1 - does not use flood_fill2
(c) 4 - modification to flood_fill2 calls that correctly fills shape, with explanation
    3 - calling flood_fill2 outside the shape with some explanation
    2 - good idea for a correct algorithm, but minor error or few details

Part 3: (20pts)

(a) 5 - correct transformation matrices, right order, explanation, plug in points
    3 - incorrect transformations but right idea and ordering
    2 - incorrect order or invalid matrix multiplication
    (for each transformation, i and ii)
(b) 10 - correct answer, matrix algebra, and accurate picture
     8 - correct answer, matrix algebra, inaccurate picture
     5 - misinterpretation of shear, but correct algebra 

Part 4: (30pts)

(a) 15 - correct rotation and scale to make it gradually get smaller and bigger, then alternate
    12 - issues with scaling (suddenly big or small), or using rotate to change size
    10 - no alternating size pattern
     8 - no size change at all, but rotating

(b) 15 - correctly rotating in both ways
    13 - issues with rotating in a circle, but still “spinning”
    10 - rotating in a circle but no spinning

Part 5: (20pts)

(a) 5 - correct Bezier curve, with at least one point clearly showing the recursive relationship
    3 - incorrect or unexplained points on the Bezier curve

(bi) 3 - all control points correct
     2 - 2 points correct, etc
(bii) 3 - correct cubic spline going through the control points
      1 - Bezier curve or incorrect points
(iii) 4 - both derivatives correct and work shown
      3 - x derivative only
      2 - y derivative only