05 Jun GSP 125 Week 5 iLab Shapes NEW
/ INSTRUCTIONS
// ————
// Compile this code. After pressing any key to clear the instructions, You
// should see three rectangles labeled ‘#’, ‘b’, and ‘c’. You should also see
// two triangles, labeled ‘d’ and ‘e’. Pressing ‘>’ and ‘<‘ will change which
// shape is labeled ‘#’. Pressing ‘w’, ‘a’, ‘s’, and ‘d’ will move the shape
// labeled ‘#’. Pressing ‘space’ will randomize the selected shape.
//
// Read through this code! Try to understand it before starting the assignment.
// Comment confusing lines with what you think code is doing, and experiment
// with existing code to test your understanding.
// Once you feel comfortable with this code, accomplish each of the following,
// and make sure your code compiles and runs after each step is completed.
//
// 1. Getting comfortable with the code
// a) Create a “makeRandom” method in both the Rect and Tri classes, based
// on the “makeRandomRect” and “makeRandomTri” functions in
// “application.cpp”. The makeRandom function should take no parameters,
// and instead make itself random. Removing the old “makeRandomRect”
// and “makeRandomTri” functions as well. Be sure to consider what to do
// about “screenMin” and “screenMax”.
// b) Create a print method for the Tri class, similar to the print method
// for the Rect class. This method may come in very handy when debugging.
// 2. Create Shape base class
// a) Create a header file (without a .cpp file) for a Shape class.
// b) Create the Shape class, which should have no member variables.
// c) Make the Shape class an interface for the Rect and Tri classes. Shape
// should have pure-virtual methods for each method that Rect and Tri have
// in common.
// d) Make sure Shape has a virtual destructor with an empty body.
// 3. Make Rect and Triangle extend Shape
// 4. Change selected
// a) Change the type of “Application::selected” from “void *” to “Shape *”.
// b) Every piece of code that typecasts “selected” (and the logic around it)
// can be removed now. Simply call functions using the “Shape” interface.
// c) Remove the “selectedType” variable from Application. Logic that needs
// some form of RunTime Type Information should use dynamic_cast instead.
// 5. Merge all Shape objects into a single array
// a) Create an array of Shape pointers in the Application called “shapes”.
// b) Making a complementary NUM_SHAPES variable would make sense.
// b) Remove “rectangles” and “triangles” arrays.
// c) Put each Tri and Rect object managed by the Application class into
// the “shapes” array. This will require re-factoring in multiple files.
// While removing references to “rectangles” and “triangles” arrays, it
// may make sense to replace pairs of for-loops using each of the old
// arrays with a single for-loop using just “shapes”.
// 6. Make “shapes” dynamic
// a) Give Application::init() 2 parameters: int numRect, int numTri
// b) Make “shapes” a pointer of type “Shape **”, and allocate it to be
// “numShapes” big, where “numShapes” is an int member of Application
// equal to (numRect + numTri), defined in Application::init().
// c) When calling “app.init()” in main, pass valid arguments for numRect
// and numTri.
// d) De-allocate the “shapes” array in Application::Release().
// 7. Clean up old variables
// a) Remove the TYPE_RECT and TYPE_TRI variables from Application.
// b) Remove NUM_TRI and NUM_RECT, and any NUM_SHAPES variable as well. Use
// numShapes where needed.
// 8. Add Circle class
// a) Create a header file AND a source file for a Circle class.
// b) Use Rect and Tri as examples to create the Circle class with.
// c) A Circle class should have at least a 2 dimensional position, and a
// radius.
// d) A simple algorithm for drawing a Circle will be similar to drawing a
// Rect or Tri, thought it might include the following code:
// float dx = center.x – col, dy = center.y – row;
// if( dx*dx + dy*dy <= radius * radius ) {
// moveCursor(col, row);
// putchar(letter);
// }
// e) Add an additional parameter to Application::init(), “int numCircles”.
// Implement init to generate Circle objects along with Rect and Tri
// objects.
// 9. Implement add/remove for the shapes array
// a) Add code that increases the size of the shapes array, adding a random
// shape, whenever the ‘=’ or ‘+’ key is pressed. Take a look at the week
// 5 lecture showing explicit constructors for help with this algorithm.
// a) Add code that decreases the size of the shapes array, removing the last
// shape, whenever the ‘-‘ or ‘_’ key is pressed. End the program when the
// last shape is removed. Removing a shape, like adding a shape, can be
// done by allocating an array of a different size (smaller this time).
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