import java.awt.*;

/**
 * A blank graph, demoing how to draw such a thing.
 * @author Adam A. Smith
 * @version 1.0
 */

public class BlankGraph {
	// constants
	private static final int WINDOW_WIDTH=1000, WINDOW_HEIGHT=1000;
	private static final int MAX_X = 20, MAX_Y = 20;
	private static final int NUM_TICKS = 11, TICK_SIZE = 10;
	private static final int MARGIN = 50;

	/**
	 * The main() function to start.
	 * @param args command-line arguments (ignored)
	 */
	public static void main(String[] args) {
		GraphicsWindow window = new GraphicsWindow("Blank Graph", 1000, 1000, 50, 50);
		window.paintBackground(Color.WHITE);
		drawAxes(window.getPen(), MARGIN, MARGIN, WINDOW_WIDTH-MARGIN, WINDOW_HEIGHT-MARGIN, MAX_X, MAX_Y, NUM_TICKS, TICK_SIZE);
		window.finalize();
	}

	// args are: pen:Graphics2D,
	// x0,y0,x1,y1:bounds of the rectangle (not including ticks)
	// maxX,maxY: the high values for leftmost x & top y
	// numTicks: # ticks to have on each side
	// tickLength: # pixels for each tick
	private static void drawAxes(Graphics2D pen, int x0, int y0, int x1, int y1, int maxX, int maxY, int numTicks, int tickLength) {
		// some pre-calcs
		int width = x1-x0, height = y1-y0;
		FontMetrics metrics = pen.getFontMetrics();
		int textHeight = metrics.getAscent();

		// draw rectangle (to go around the graph)
		pen.setColor(Color.BLACK);
		pen.drawRect(x0, y0, width, height);

		// draw ticks & labels
		for (int i=0; i<numTicks; i++) {
			// x ticks
			int x = x0 + (width * i) / (numTicks-1);
			pen.drawLine(x, y1+tickLength, x, y1);

			// x labels
			String label = String.valueOf(maxX * i / (numTicks-1));
			int textWidth = metrics.stringWidth(label);
			pen.drawString(label, x-textWidth/2, y1+tickLength*3/2+textHeight);

			// y ticks
			int y = y1 - (height * i) / (numTicks-1);
			pen.drawLine(x0-10, y, x0, y);

			// y labels
			label = String.valueOf(maxY * i / (numTicks-1));
			textWidth = metrics.stringWidth(label);
			pen.drawString(label, x0-textWidth-tickLength*3/2, y+textHeight/2);
		}
	}
}