Question

I can't figure out the speed for this, how to make it move? This is done in processing in java language.

move()
This function moves the balloon as specified in the x and y speed instance variables. If the balloon would move off the screen, it reverses direction. The balloon may not leave the window; the string may.
Also this is what I am suppose to get,
http://evc-cit.info/cit020/objects.html

Answer 1

Balloon balloon1;
Balloon balloon2;

void setup()
{
size(300, 300);
balloon1 = new Balloon(50, 60, 20, 30, color(255, 0, 0));
balloon2 = new Balloon(70, 100, 30, 40, color(0, 255, 255));
}
void draw()
{
background(255);
balloon1.move();
balloon1.display();
balloon2.move();
balloon2.display();
}



class Balloon
{
float x;
float y;
float w;
float h;
color c;
float xSpeed;
float ySpeed;

Balloon(float bx, float by, float bw, float bh, color bc)
{
x = bx;
y = by;
w = bw;
h = bh;
c = bc;
xSpeed = 1;
ySpeed = 2;
}

void display()
{
fill(c);
ellipse(x, y, w, h);
}

void move()
{
// do stuff here
}
}

Answer 2

This is what I attempted so far but its not quite working.
void move()
{
x += xSpeed;
y += ySpeed;

if (x >= width - w/2)
{
xSpeed = xSpeed * -1;
if (x >= 0+w/2)
{
xSpeed = xSpeed * 1;
}

Answer 3

you need to do paint/paintComponent and then repaint to make it move. It just wont move by itself.. If you're doing a gui that is.

Answer 4

yes this uses a gui.

Answer 5

I am not sure what you mean by paint or gui?

Answer 6

do you see how it moves on th screen? That's a gui Graphical user Interface.

Answer 7

What is the problem you are facing?

Answer 8

Well I am trying to make the balloon like in the link, but mine do not stay in the window. The balloons are not suppose to leave the window but mine do. I am trying to figure how to make them stay inside the window.

Answer 9

so they do move then? You need to use collision detection.

Answer 10

How do they move without you painting?

Answer 11

draw?

Answer 12

mine just start from the top and leave the window

Answer 13

Is that what you are trying to ask?

Answer 14

yes. But what does your draw method look liek?

Answer 15

Um...I actually got it to stay in the window, here is the updated code.
void move()
{
x += xSpeed;
y += ySpeed;
//
if (x < 0 || x > width) xSpeed *= -1;
if (y < 0 || y > height) ySpeed *= -1;
}
}

Answer 16

I just need to make it go faster and add the string which I need to figure out;
display()
This function draws the balloon at its current position. It will also draw a a string at the bottom of the balloon (using a black line()). The string starts at the center of the balloon at the bottom, and extends to the right one-third the width of the balloon and the line’s height is one-third the height of the balloon. The string is outside the balloon’s bounding box.

Answer 17

I'm not sure why your code even displays anything moving. The speed is supposed to be random... I need to go to bed though, goo dluck I'll see hjow you are in the morning.

Answer 18

ok that's fine