Description
1. Write down a Python program to draw a rotating triangle.
A. Set the window title to your student ID and the window size to (480,480).
B. Draw a triangle using render() function below (DO NOT modify it!).
def render(T):
glClear(GL_COLOR_BUFFER_BIT) glLoadIdentity() # draw cooridnate glBegin(GL_LINES) glColor3ub(255, 0, 0) glVertex2fv(np.array([0.,0.])) glVertex2fv(np.array([1.,0.])) glColor3ub(0, 255, 0) glVertex2fv(np.array([0.,0.])) glVertex2fv(np.array([0.,1.]))
glEnd()
# draw triangle glBegin(GL_TRIANGLES)
glColor3ub(255, 255, 255)
glVertex2fv( (T @ np.array([.0,.5,1.]))[:-1] ) glVertex2fv( (T @ np.array([.0,.0,1.]))[:-1] ) glVertex2fv( (T @ np.array([.5,.0,1.]))[:-1] ) glEnd()
C. Expected result: Uploaded LabAssignment3-1.mp4
Key
Transformation
W
Scale by 0.9 times in y direction
E
Scale by 1.1 times in y direction
S
Rotate by 10 degrees counterclockwise
D
Rotate by 10 degrees clockwise
X
Translate by 0.1 in x direction
i. Do not mind the initial angle of the triangle.
D. The triangle should be t rad rotated when t seconds have elapsed since the program was executed.
E. You need to somehow combine a rotation matrix and a translation matrix to produce the expected result.
F. Files to submit: A Python source file (Name the file whatever you want (in English). Extension should be .py)
2. Write down a Python program to draw a transformed triangle.
A. Set the window title to your student ID and the window size to (480,480).
B. Draw a triangle using render() function of prob 1 (DO NOT modify it!).
C. If you press or repeat a key, the triangle should be transformed as shown in the Table:
C
Translate by -0.1 in x direction
R
Reflection across the origin
1
Reset the triangle with identity matrix
D. Transformations should be accumulated (composed with previous one) unless you press ‘1’.
i. Be sure: gComposedM = newM @ gComposedM
ii. You’ll need to make ‘gComposedM’ as a global variable.
E. Files to submit: A Python source file (Name the file whatever you want (in English).
Extension should be .py)
