import objectdraw.*;
import java.awt.*;
import java.util.Random;

// This program allows the user to draw lines of randomly chosen colors on the screen
// using the mouse as if it were a crayon
public class Crayon extends FrameWindowController {

    // number of crayon colors to choose from
    private static final int NUM_CRAYONS = 4;

    // random int generated for color selection
    private int colorNumber;   

    // a random number generator that generates random numbers
    // between 1 and 4 (inclusive)
    private Random colorPicker = new Random();
    
    private Location lastPoint;  // location where mouse was last pressed
    private Color currentColor;  // current color for scribbling

    // remember point of press
    // generate a random color with which lines will be drawn
    public void onMousePress(Location point) {
        lastPoint = point;
        colorNumber = colorPicker.nextInt(NUM_CRAYONS);
        if (colorNumber == 1) {
            currentColor = Color.RED;
        } else if (colorNumber == 2) {
            currentColor = Color.BLUE;
        } else if (colorNumber == 3 ) {
            currentColor = Color.GREEN;
        } else {
            currentColor = Color.MAGENTA;
        }
    }

    // draws a line with the random color selected at the time of mouse press
    public void onMouseDrag(Location point) {
        new Line(lastPoint, point, canvas).setColor(currentColor);
        lastPoint = point;
    }

}