Generating scheme Code from C++

Below are listed two C++ functions you need to write, each of these functions prints out some scheme code. The main program below can be used to test your C++ functions, which should generate scheme code that produced the following drawing:

void draw_circles(int x, int y, int r)

Write the function draw_circles that draws a number of circles whose center is given by x and y. The largest circle drawn should have a radius r, the function should generates a circle of radius r-10 (and r-20, etc) until the radius becomes smaller then 10 (stop once you have a circle with radius <= 10).

Your C++ function should generate the scheme code that draws the appropriate circles (use cout to output the scheme code). For example, if your function was called like this:

    draw_circles(100,100,100);

the output should be some scheme code that calls the scheme draw-circle function that produces something like this:

void draw_checkerboard(int x, int y, int width, int cellsize)

Write the function draw_checkerboard that draws a black and red checkerboard whose top left coordinate is given by x and y. Each cell on the board should be a square of size cellsize. The checkerboard should be width x width (width rows and width columns).

Your C++ function should generate the scheme code that draws the checkerboard. For example, if your function was called like this:

    draw_checkerboard(100,100,4,50);

the output should be some scheme code that calls the scheme draw-solid-rect function (many times) that produces something like this:

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Sample main function

Below is a C++ main() function you can use to test your functions. If you take the output and save it in a scheme file, then run the scheme code you should see something like the image shown:

// Sample main int main() { // initial output calls the scheme start function cout << "(start 400 400)" << endl; // draw a bunch of circles draw_circles(200,100,100); draw_circles(100,200,100); draw_circles(200,300,100); draw_circles(300,200,100); // draw a 4x4 checkerboard draw_checkerboard(100,100,4,50); return(0); }

Running the C++ program and saving the output

You can run your C++ program from the command line (inside a "Shell Window") and save the output to a file, which you can then load in drscheme and run. Dave will demonstrate this in class.