Final answer:
Hit-testing with transformed shapes can be done using two methods: the geometric approach, which applies the inverse of the transformation to the point and hit-tests as if the shape were untransformed; and the rendering approach, which involves rendering to a bitmap and testing the relevant pixel. The geometric approach is generally preferred for its efficiency and accuracy.
Step-by-step explanation:
Hit-testing is the process used in computer graphics to determine if a user-controlled cursor or pointer intersects with a graphical object, which is particularly important when that object has undergone transformations such as scaling, rotation, or skewing. The two approaches for hit-testing with transformed shapes are:
- The geometric approach, which involves applying the inverse of the transformation to the point being tested, and then performing the hit-test as if the shape were not transformed.
- The rendering approach, which involves rendering the shape to a bitmap, and then testing whether the pixel under the cursor is part of the shape.
While both methods are valid, the geometric approach is generally preferred for its efficiency and accuracy, particularly when working with vector-based graphics, as it avoids the overhead and potential inaccuracies of bitmap representation.