Description
1. Write down a Python program to draw a rotating triangle.
- Set the window title to your student ID and the window size to (480,480).
- 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 i. Do not mind the initial angle of the triangle.
- The triangle should be t rad rotated when t seconds have elapsed since the program was executed.
- You need to somehow combine a rotation matrix and a translation matrix to produce the expected result.
- 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.
- Set the window title to your student ID and the window size to (480,480).
- Draw a triangle using render() function of prob 1 (DO NOT modify it!).
- If you press or repeat a key, the triangle should be transformed as shown in the Table:
Key
W E
S D X
|
Transformation |
|
Scale by 0.9 times in y direction |
|
Scale by 1.1 times in y direction |
|
Rotate by 10 degrees counterclockwise |
|
Rotate by 10 degrees clockwise |
|
Translate by 0.1 in x direction |
|
Translate by -0.1 in x direction |
|
Reflection across the origin |
|
Reset the triangle with identity matrix |
D.
C R 1
Transformations should be accumulated (composed with previous one) unless you press ‘1’.
- Be sure: gComposedM = newM @ gComposedM
- 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)
F. Expected result
When starts W *3 S *3
C *3 R
1
