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cloud_tutorial/main.js at master · learn-alexuser01/cloud_tutorial · GitHub
learn-alexuser01
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main.js
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/*
Defining our variables
world and viewport are DOM elements,
worldXAngle and worldYAngle are floats that hold the world rotations,
d is an int that defines the distance of the world from the camera
*/
var
world
=
document
.
getElementById
(
'world'
)
,
viewport
=
document
.
getElementById
(
'viewport'
)
,
worldXAngle
=
0
,
worldYAngle
=
0
,
d
=
0
;
/*
Event listener to transform mouse position into angles
from -180 to 180 degress, both vertically and horizontally
*/
window
.
addEventListener
(
'mousemove'
,
function
(
e
)
{
worldYAngle
=
-
(
.5
-
(
e
.
clientX
/
window
.
innerWidth
)
)
*
360
;
worldXAngle
=
(
.5
-
(
e
.
clientY
/
window
.
innerHeight
)
)
*
360
;
updateView
(
)
;
}
)
;
window
.
addEventListener
(
'mousewheel'
,
onContainerMouseWheel
)
;
window
.
addEventListener
(
'DOMMouseScroll'
,
onContainerMouseWheel
)
;
/*
Changes the transform property of world to be
translated in the Z axis by d pixels,
rotated in the X axis by worldXAngle degrees and
rotated in the Y axis by worldYAngle degrees.
*/
function
updateView
(
)
{
var
t
=
'translateZ( '
+
d
+
'px ) rotateX( '
+
worldXAngle
+
'deg) rotateY( '
+
worldYAngle
+
'deg)'
;
world
.
style
.
webkitTransform
=
t
;
}
///////////////
/*
objects is an array of cloud bases
layers is an array of cloud layers
*/
var
objects
=
[
]
,
layers
=
[
]
;
/*
Clears the DOM of previous clouds bases
and generates a new set of cloud bases
*/
function
generate
(
)
{
objects
=
[
]
;
layers
=
[
]
;
if
(
world
.
hasChildNodes
(
)
)
{
while
(
world
.
childNodes
.
length
>=
1
)
{
world
.
removeChild
(
world
.
firstChild
)
;
}
}
//Create j amount of clouds
for
(
var
j
=
0
;
j
<
10
;
j
++
)
{
//Push cloud created from createCloud() function to objects array
objects
.
push
(
createCloud
(
)
)
;
}
}
generate
(
)
;
function
makeMoon
(
)
{
var
moon
=
document
.
createElement
(
'div'
)
;
moon
.
className
=
'moon'
;
world
.
appendChild
(
moon
)
;
var
random_x
=
256
-
(
Math
.
random
(
)
*
512
)
;
var
random_y
=
256
-
(
Math
.
random
(
)
*
512
)
;
var
random_z
=
256
-
(
Math
.
random
(
)
*
512
)
;
moon
.
data
=
{
x
:
random_x
,
y
:
random_y
,
z
:
random_z
}
;
var
t
=
'translateX( '
+
random_x
+
'px ) translateY( '
+
random_y
+
'px ) translateZ( '
+
random_z
+
'px )'
;
moon
.
style
.
webkitTransform
=
t
;
objects
.
push
(
moon
)
;
}
;
makeMoon
(
)
;
/*
Creates a single cloud base: a div in world
that is translated randomly into world space.
Each axis goes from -256 to 256 pixels.
*/
function
createCloud
(
)
{
var
div
=
document
.
createElement
(
'div'
)
;
div
.
className
=
'cloudBase'
;
var
random_x
=
256
-
(
Math
.
random
(
)
*
512
)
;
var
random_y
=
256
-
(
Math
.
random
(
)
*
512
)
;
var
random_z
=
256
-
(
Math
.
random
(
)
*
512
)
;
var
t
=
'translateX( '
+
random_x
+
'px ) translateY( '
+
random_y
+
'px ) translateZ( '
+
random_z
+
'px )'
;
div
.
style
.
webkitTransform
=
t
;
var
colorR
=
Math
.
floor
(
Math
.
random
(
)
*
255
)
;
var
colorG
=
Math
.
floor
(
Math
.
random
(
)
*
255
)
;
var
colorB
=
Math
.
floor
(
Math
.
random
(
)
*
255
)
;
// div.style.backgroundColor = "rgb(" + colorR+"," + colorG+ ","+ colorB + ")";
world
.
appendChild
(
div
)
;
//add layers to cloud
for
(
var
j
=
0
;
j
<
10
+
Math
.
round
(
Math
.
random
(
)
*
10
)
;
j
++
)
{
var
cloud
=
document
.
createElement
(
'img'
)
;
cloud
.
setAttribute
(
'src'
,
"cloud.png"
)
;
cloud
.
className
=
'cloudLayer'
;
// var random_x = 256 - ( Math.random() * 512 );
// var random_y = 256 - ( Math.random() * 512 );
var
random_z
=
100
-
(
Math
.
random
(
)
*
200
)
;
var
random_d
=
Math
.
random
(
)
*
360
;
var
random_s
=
.25
+
Math
.
random
(
)
;
// add an object for data to allow for the 3D effect
cloud
.
data
=
{
x
:
random_x
,
y
:
random_y
,
z
:
random_z
,
a
:
random_d
,
s
:
random_s
,
speed
:
.1
*
Math
.
random
(
)
}
;
// var random_y = 256 - ( Math.random() * 512 );
var
t
=
'translateX( '
+
random_x
+
'px ) translateY( '
+
random_y
+
'px ) translateZ( '
+
random_z
+
'px ) rotateZ( '
+
random_d
+
'deg ) scale( '
+
random_s
+
' )'
;
cloud
.
style
.
webkitTransform
=
t
;
div
.
appendChild
(
cloud
)
;
layers
.
push
(
cloud
)
;
}
return
div
;
}
//function to determine z translation viewpoint
function
onContainerMouseWheel
(
event
)
{
event
=
event
?
event
:
window
.
event
;
d
=
d
-
(
event
.
detail
?
event
.
detail
*
-
5
:
event
.
wheelDelta
/
8
)
;
updateView
(
)
;
}
/*
Iterate layers[], update the rotation and apply the
inverse transformation currently applied to the world.
Notice the order in which rotations are applied.
*/
function
update
(
)
{
for
(
var
j
=
0
;
j
<
layers
.
length
;
j
++
)
{
var
layer
=
layers
[
j
]
;
layer
.
data
.
a
+=
layer
.
data
.
speed
;
var
t
=
'translateX( '
+
layer
.
data
.
x
+
'px ) \
translateY( '
+
layer
.
data
.
y
+
'px ) \
translateZ( '
+
layer
.
data
.
z
+
'px ) \
rotateY( '
+
(
-
worldYAngle
)
+
'deg ) \
rotateX( '
+
(
-
worldXAngle
)
+
'deg ) \
rotateZ( '
+
(
layer
.
data
.
a
)
+
'deg ) \
scale( '
+
layer
.
data
.
s
+
')'
;
layer
.
style
.
webkitTransform
=
t
;
}
var
moon
=
objects
[
10
]
;
var
m
=
'translateX( '
+
moon
.
data
.
x
+
'px ) \
translateY( '
+
moon
.
data
.
y
+
'px ) \
translateZ( '
+
moon
.
data
.
z
+
'px ) \
rotateY( '
+
(
-
worldYAngle
)
+
'deg ) \
rotateX( '
+
(
-
worldXAngle
)
+
'deg ) \
rotateZ( '
+
10
+
'deg)'
moon
.
style
.
webkitTransform
=
m
;
requestAnimationFrame
(
update
)
;
}
update
(
)
;
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