import java.awt.Color;
import graphics.*;

public class DrawApp {
    
    private static int nCircles = 50;

    // main method
    public static void main(String[] args) {
        
        // Java provides a default constructor (no parameter version)
        // IF there is NO constructor at all
        // ERROR: non-default constructor exists in CircularStroke
        //CircularStroke csDefault = new CircularStroke();
        
        //canvas.resize(400, 400);
        
        // create a Strokes array of size nCircles
        // use IS-A relationship 
        // e.g.) CircularStroke IS-A Stroke, SquareStroke IS-A Stroke
        Stroke[] strokes = new Stroke[nCircles];
                
        //strokes[0].draw();
        
        int cx;
        int cy;
        int size  = 10;
        Color c  = Color.BLACK;
        boolean f = true;    
        
        char choice = canvas.promptChar("Choose stroke type: C or S");
        
        canvas.waitForUserClick();
        
        for (int i = 0; i < nCircles; ++i) {
            //canvas.clear();
            
            // sample mouse position
            cx = canvas.getMouseX();
            cy = canvas.getMouseY();        
            
            // polymorphism: variable stroke can point to object of different types
            //               any behavior you expect on the stroke must be at least 
            //               declared in the Stroke class (at least method signature)
            Stroke stroke = null;     // polymorphism
            // variable scope: only available/accessible within the closest enclosing { }
            if (choice == 'C' || choice == 'c') {        
                stroke = new CircularStroke(cx, cy, size, f);
                
            }
            else if (choice == 'S' || choice == 's'){
                stroke = new SquareStroke(cx, cy, size, f);
            }
            else {
                // for any default/error handling, the code is here
            }
            
            /****** HUGE concept: DYNAMIC BINDING *****/
            
            stroke.draw();
            
            strokes[i] = stroke;
            
            canvas.sleep(0.08);
            
        }
        
        canvas.waitForUserClick();
        
        canvas.clear();
        
        for (Stroke stroke : strokes) {
            stroke.draw();
        }
        
    }
}