Intro2CS_ArielU_2026A/src/classes/week4/StdDrawTest.java at main · benmoshe/Intro2CS_ArielU_2026A · GitHub

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package classes.week4;
/** This is NOT a Junit class - as it tests GUI components which
 * should not be tested using Junit.
 *
 * The Code uses the STDDraw class:
 * https://introcs.cs.princeton.edu/java/stdlib/javadoc/StdDraw.html
 * @author boaz.benmoshe
 *
 */
public class StdDrawTest {
	public static void main(String[] a) {
//		testSimpleGUI();
		testClip();
//		testDrawGraphs();
//		int[][] mat = {{1,1,1,1,1}, {1,0,1,0,1}, {1,0,0,0,1},  {1,0,1,0,1},  {1,1,1,1,1}, {1,0,1,0,1}};
//		drawMat(mat);

	}

	public static void drawMat(int[][] mat) {
		StdDraw.setScale(0, 1);
		StdDraw.clear();
		for(int y=0;y<mat.length;y++) {
			for(int x=0;x<mat[0].length;x++) {
				int v = mat[y][x];
				if(v==0) {StdDraw.setPenColor(StdDraw.BLACK);}
				else {StdDraw.setPenColor(StdDraw.BOOK_RED);}
				double r = 1/15.0;
				double x1 = 0.1+2.2*r*x;
				double y1 = 1-(0.1+2.2*r*y);
				StdDraw.filledSquare(x1,y1,r);
			}
		}
		StdDraw.show();
		StdDraw.pause(2);
	}
	public static void testSimpleGUI() {
		StdDraw.setScale(-2, +2);
		 StdDraw.square(.2, .8, .1);
		  StdDraw.filledSquare(.8, .8, .2);
		  StdDraw.circle(.8, .2, .2);
		  StdDraw.setPenColor(StdDraw.BOOK_RED);
		  StdDraw.setPenRadius(.02);
		  StdDraw.arc(.8, .2, .1, 200, 45);
		  // draw a blue diamond
		  StdDraw.setPenRadius();
		  StdDraw.setPenColor(StdDraw.BOOK_BLUE);
		  double[] x = { .1, .2, .3, .2 };
		  double[] y = { .2, .3, .2, .1 };
		  StdDraw.filledPolygon(x, y);
		  // text
		  StdDraw.setPenColor(StdDraw.BLACK);
		  StdDraw.text(0.2, 0.5, "black text");
		  StdDraw.setPenColor(StdDraw.WHITE);
		  StdDraw.text(0.8, 0.8, "white text");
		  StdDraw.show();
		  StdDraw.pause(2000);
		  StdDraw.clear();
	}
	public static void testClip() {
		StdDraw.setScale(-6, +6);
		StdDraw.enableDoubleBuffering();
		for (double t = 0.0; t<2*Math.PI; t += 0.02) {
			double x = Math.sin(t);
			double y = Math.cos(t);
			StdDraw.clear();
			StdDraw.setPenColor(StdDraw.RED);
			StdDraw.filledCircle(x, y, 0.1);
			StdDraw.setPenColor(StdDraw.BLACK);
			StdDraw.filledRectangle(-x, -y, 0.05, 0.2);
			StdDraw.setPenColor(StdDraw.CYAN);
			StdDraw.filledCircle(x*1.2, -y/2, 0.15);
			StdDraw.show();
			StdDraw.pause(10);
		}
	}
	public static void testDrawGraphs() {
		StdDraw.clear();
		double eps = 0.02;
		for(double x = -2; x<2;x+=eps) {
			double x0 = x;
			double x1 = x0+eps;
			double y0 = Math.sin(x0);
			double y1 = Math.sin(x1);
			double t0 = 1.5*Math.cos(x0*3);
			double t1 = 1.5*Math.cos(x1*3);
			double z0 = 1.5*Math.cos(x0*x0*3);
			double z1 = 1.5*Math.cos(x1*x1*3);
			StdDraw.setPenColor(StdDraw.RED);
			StdDraw.line(x0, y0, x1, y1);
			StdDraw.setPenColor(StdDraw.BLUE);
			StdDraw.line(x0, t0, x1, t1);
			StdDraw.setPenColor(StdDraw.CYAN);
			StdDraw.line(x0, z0, x1, z1);
			StdDraw.show();
			StdDraw.pause(10);
		}
	}

}