Midterm exam 1 review Sp2006: Making Concentric Boxes
Questions, comments, concerns, answers, concerns about answers?
(Back to Midterm Exam 1 Review Sp2006)
This one was fun!
public class MyTurtlePicture {
public static void main(String [] args) {
//FileChooser.setMediaPath("D:/cs1316/MediaSources/");
Picture canvas = new Picture(500,500);
Turtle jenny = new Turtle(canvas);
//Picture lilTurtle = new Picture(FileChooser.getMediaPath("Turtle.jpg"));
/* Contrary to my math education, heading 0 in this case points up (I'm pretty certain)
* So let's start by heading east. */
jenny.setHeading(90);
/* We'll be making a total of 12 lines */
/* I'm taking a shortcut around making 3 loops like this:
* Each time through, the line is 50 px longer.
* So, 100+50*0, 100+50*1, 100+50*2
* I used (int)(i/4) to produce 0, 1, 2 (increments by a whole integer every 4 sides) */
for(i=0;i<12;i++){
jenny.forward(100+(50*(int)(i/4)));
jenny.turnLeft();
/* Yes, turnLeft does exist. It's in simpleTurtle. */
}
canvas.show();
}
}
I think I put in more comments than code! If someone wants to post a 3 loop solution, please do...
/**
*Method to draw 3 squares(100pixel, 150 pixel, and 200 pixel) on a blank canvas using a turtle
**/
public class TurtleBoxes{
public static void main(String[] args)
{
FileChooser.setMediaPath("C:/cs1316/MediaSources/");
Picture canvas = new Picture(500, 500);
Turtle yurtle = new Turtle(canvas);
//first square made before the for loop so we don't get any errors with the loop (debugging sucks)
yurtle.forward(100);yurtle.turn(90);
yurtle.forward(100);yurtle.turn(90);
yurtle.forward(100);yurtle.turn(90);
yurtle.forward(100);yurtle.turn(90);
//for loop, i < 8 because we need it to make a square with 4 sides
for (int i=0;i<8;i++)
{
if (i<4)
{yurtle.forward(150);yurtle.turn(90);}
else
{yurtle.forward(200);yurtle.turn(90);}
}
//We want to see the result, and I added in canvas.write(...) to post the picture
canvas.show();canvas.write("C:/cs1316/TurtleBoxes.jpeg");
}
}
I'm going to assume that there are some less than signs that got deleted there...Same thing happened to me earlier, the swiki did it to me.
i<8 and i<4
But, yeah–that's good!
~Jim
hmm... I am confused because I see "i<8" and "i<4"
in the written code....
I guess they must have fixed it... :):)
Is it possible to do this without a loop, something like:
public class 3BoxTurtle{
public static void main(String[] args){
Picture canvas = new Picture(400, 400);
Turtle turt = new Turtle(canvas);
//The first square
turt.forward(100);turt.turn(90);
turt.forward(100);turt.turn(90);
turt.forward(100);turt.turn(90);
turt.forward(100);turt.turn(90);
//The second square
turt.forward(150);turt.turn(90);
turt.forward(150);turt.turn(90);
turt.forward(150);turt.turn(90);
turt.forward(150);turt.turn(90);
//The third square
turt.forward(200);turt.turn(90);
turt.forward(200);turt.turn(90);
turt.forward(200);turt.turn(90);
turt.forward(200);turt.turn(90);
canvas.show();}
| To show < and >, either (a) put <code> and </code> around the code or (b) put in < and >. Otherwise, your browser eats the < and >, thinking it must be part of the HTML that just got screwed up. Mark Guzdial |
Link to this Page
