Create an application with one DOM element that is always moving right, at a speed of 2 pixels per update
Create an application with one DOM element that is always moving right, at a speed of 2 pixels per update. When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
This is what I have so far but I can't get the ball to bounce to the left.
var ball = document.querySelector(".ball");
var animationArea = document.querySelector("#animationArea");
setInterval(update, 30); //this will call the tick function every 1000 miliseconds
var x = 0;
var y = 0;
var velocityX=2;
var velocityY=2;
function update()
//run your update code
x = x + velocityX;
y = y + velocityY;
ball.style.right = x + "px";
ball.style.left = y + "px";
if (x>=800)
//bounce the ball
velocityX = 2;
y = 300;
requestAnimationFrame(update);
javascript
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
add a comment |
Create an application with one DOM element that is always moving right, at a speed of 2 pixels per update. When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
This is what I have so far but I can't get the ball to bounce to the left.
var ball = document.querySelector(".ball");
var animationArea = document.querySelector("#animationArea");
setInterval(update, 30); //this will call the tick function every 1000 miliseconds
var x = 0;
var y = 0;
var velocityX=2;
var velocityY=2;
function update()
//run your update code
x = x + velocityX;
y = y + velocityY;
ball.style.right = x + "px";
ball.style.left = y + "px";
if (x>=800)
//bounce the ball
velocityX = 2;
y = 300;
requestAnimationFrame(update);
javascript
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
you probably don't want to be calling the update function with bothsetIntervalandrequestAnimationFrame...
– Punit
Nov 14 '18 at 17:40
also, the ball's x coordinate should correspond with itsleftproperty, and the y coordinate should correspond with itstopproperty
– Punit
Nov 14 '18 at 17:42
add a comment |
Create an application with one DOM element that is always moving right, at a speed of 2 pixels per update. When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
This is what I have so far but I can't get the ball to bounce to the left.
var ball = document.querySelector(".ball");
var animationArea = document.querySelector("#animationArea");
setInterval(update, 30); //this will call the tick function every 1000 miliseconds
var x = 0;
var y = 0;
var velocityX=2;
var velocityY=2;
function update()
//run your update code
x = x + velocityX;
y = y + velocityY;
ball.style.right = x + "px";
ball.style.left = y + "px";
if (x>=800)
//bounce the ball
velocityX = 2;
y = 300;
requestAnimationFrame(update);
javascript
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
Create an application with one DOM element that is always moving right, at a speed of 2 pixels per update. When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
This is what I have so far but I can't get the ball to bounce to the left.
var ball = document.querySelector(".ball");
var animationArea = document.querySelector("#animationArea");
setInterval(update, 30); //this will call the tick function every 1000 miliseconds
var x = 0;
var y = 0;
var velocityX=2;
var velocityY=2;
function update()
//run your update code
x = x + velocityX;
y = y + velocityY;
ball.style.right = x + "px";
ball.style.left = y + "px";
if (x>=800)
//bounce the ball
velocityX = 2;
y = 300;
requestAnimationFrame(update);
javascript
javascript
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
edited Nov 14 '18 at 17:21
Alfredo A.
98011633
98011633
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
asked Nov 14 '18 at 16:20
seanstacksseanstacks
61
61
Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
you probably don't want to be calling the update function with bothsetIntervalandrequestAnimationFrame...
– Punit
Nov 14 '18 at 17:40
also, the ball's x coordinate should correspond with itsleftproperty, and the y coordinate should correspond with itstopproperty
– Punit
Nov 14 '18 at 17:42
add a comment |
Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
you probably don't want to be calling the update function with bothsetIntervalandrequestAnimationFrame...
– Punit
Nov 14 '18 at 17:40
also, the ball's x coordinate should correspond with itsleftproperty, and the y coordinate should correspond with itstopproperty
– Punit
Nov 14 '18 at 17:42
Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
you probably don't want to be calling the update function with both
setInterval and requestAnimationFrame...– Punit
Nov 14 '18 at 17:40
you probably don't want to be calling the update function with both
setInterval and requestAnimationFrame...– Punit
Nov 14 '18 at 17:40
also, the ball's x coordinate should correspond with its
left property, and the y coordinate should correspond with its top property– Punit
Nov 14 '18 at 17:42
also, the ball's x coordinate should correspond with its
left property, and the y coordinate should correspond with its top property– Punit
Nov 14 '18 at 17:42
add a comment |
1 Answer
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votes
The solution is in the question itself:
When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
if (x >= 800) // When it it reaches 800 pixels to the right (a 'left' property of '800px')
x = 0; // return it to the far left of the screen (a 'left' property of '0px')
answered Nov 14 '18 at 17:49
PunitPunit
96749
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
active
oldest
votes
active
oldest
votes
The solution is in the question itself:
When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
if (x >= 800) // When it it reaches 800 pixels to the right (a 'left' property of '800px')
x = 0; // return it to the far left of the screen (a 'left' property of '0px')
answered Nov 14 '18 at 17:49
PunitPunit
96749
add a comment |
The solution is in the question itself:
When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
if (x >= 800) // When it it reaches 800 pixels to the right (a 'left' property of '800px')
x = 0; // return it to the far left of the screen (a 'left' property of '0px')
answered Nov 14 '18 at 17:49
PunitPunit
96749
add a comment |
The solution is in the question itself:
When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
if (x >= 800) // When it it reaches 800 pixels to the right (a 'left' property of '800px')
x = 0; // return it to the far left of the screen (a 'left' property of '0px')
answered Nov 14 '18 at 17:49
PunitPunit
96749
The solution is in the question itself:
When it it reaches 800 pixels to the right (a 'left' property of '800px'), return it to the far left of the screen (a 'left' property of '0px').
if (x >= 800) // When it it reaches 800 pixels to the right (a 'left' property of '800px')
x = 0; // return it to the far left of the screen (a 'left' property of '0px')
answered Nov 14 '18 at 17:49
PunitPunit
96749
answered Nov 14 '18 at 17:49
PunitPunit
96749
answered Nov 14 '18 at 17:49
PunitPunit
96749
answered Nov 14 '18 at 17:49
PunitPunit
96749
96749
add a comment |
add a comment |
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Please fix the mismatch between the comment and the setInterval line in the code sample, it is a major OCD trigger :-)
– Paul-Jan
Nov 14 '18 at 16:23
you probably don't want to be calling the update function with both
setIntervalandrequestAnimationFrame...– Punit
Nov 14 '18 at 17:40
also, the ball's x coordinate should correspond with its
leftproperty, and the y coordinate should correspond with itstopproperty– Punit
Nov 14 '18 at 17:42