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2D transformation

You will develop an OpenGL program that allow a user to perform 2D affine transformation, including

translation, scaling, rotation, on a 2D object (e.g., a solid square), by selecting an transformation item

from the popup menu. In this project, you can have two-layer menu as follows:

• Translation

– Horizontal increment

– Horizontal decrement

– Vertical increment

– Vertical decrement

• Scaling

– Horizontal enlarging

– Horizontal shrinking

– Vertical enlarging

– Vertical shrinking

• Rotation

– Clockwise

– Counter-clockwise

Your code will need to maintain several geometry parameters of an object, including horizontal and

vertical translation, orientation, and scaling factors. You code should include a function (called menu),

in which you should update the geometry parameters of the object.

The object should be “complicated”, i.e., a composition of at least 2 OpenGL geometry primitives.

The following parameters should be used for an individual 2D transformation:

• 10 pixels for horizontal increment/decrement

2• 2 for horizontal enlarging, and 0.5 for horizontal shrinking

• 20 ◦ for a rotation.

students should explicitly construct a transformation matrix in order to perform a speci-

fied 2D transformation to the object. The transformation matrix is represented as a one-dimensional

array in OpenGL that is used as a parameter for the OpenGL function glMultMatrix() to update

the current transformation matrix.

students should also implement a simulation of moving the object. Specifically, the object

is moved around a circle track clockwise and be back to its original position. So it is basically a

task of performing a sequence of translations on the object.

Kĩ năng: Lập trình C, Lập trình C++, Linux, OpenGL

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