.. only:: html
.. note::
:class: sphx-glr-download-link-note
Click :ref:`here <sphx_glr_download_gallery_animation_rain.py>` to download the full example code
.. rst-class:: sphx-glr-example-title
.. _sphx_glr_gallery_animation_rain.py:
===============
Rain simulation
===============
Simulates rain drops on a surface by animating the scale and opacity
of 50 scatter points.
Author: Nicolas P. Rougier
.. only:: builder_html
.. container:: sphx-glr-animation
.. raw:: html
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css">
<script language="javascript">
function isInternetExplorer() {
ua = navigator.userAgent;
/* MSIE used to detect old browsers and Trident used to newer ones*/
return ua.indexOf("MSIE ") > -1 || ua.indexOf("Trident/") > -1;
}
/* Define the Animation class */
function Animation(frames, img_id, slider_id, interval, loop_select_id){
this.img_id = img_id;
this.slider_id = slider_id;
this.loop_select_id = loop_select_id;
this.interval = interval;
this.current_frame = 0;
this.direction = 0;
this.timer = null;
this.frames = new Array(frames.length);
for (var i=0; i<frames.length; i++)
{
this.frames[i] = new Image();
this.frames[i].src = frames[i];
}
var slider = document.getElementById(this.slider_id);
slider.max = this.frames.length - 1;
if (isInternetExplorer()) {
// switch from oninput to onchange because IE <= 11 does not conform
// with W3C specification. It ignores oninput and onchange behaves
// like oninput. In contrast, Mircosoft Edge behaves correctly.
slider.setAttribute('onchange', slider.getAttribute('oninput'));
slider.setAttribute('oninput', null);
}
this.set_frame(this.current_frame);
}
Animation.prototype.get_loop_state = function(){
var button_group = document[this.loop_select_id].state;
for (var i = 0; i < button_group.length; i++) {
var button = button_group[i];
if (button.checked) {
return button.value;
}
}
return undefined;
}
Animation.prototype.set_frame = function(frame){
this.current_frame = frame;
document.getElementById(this.img_id).src =
this.frames[this.current_frame].src;
document.getElementById(this.slider_id).value = this.current_frame;
}
Animation.prototype.next_frame = function()
{
this.set_frame(Math.min(this.frames.length - 1, this.current_frame + 1));
}
Animation.prototype.previous_frame = function()
{
this.set_frame(Math.max(0, this.current_frame - 1));
}
Animation.prototype.first_frame = function()
{
this.set_frame(0);
}
Animation.prototype.last_frame = function()
{
this.set_frame(this.frames.length - 1);
}
Animation.prototype.slower = function()
{
this.interval /= 0.7;
if(this.direction > 0){this.play_animation();}
else if(this.direction < 0){this.reverse_animation();}
}
Animation.prototype.faster = function()
{
this.interval *= 0.7;
if(this.direction > 0){this.play_animation();}
else if(this.direction < 0){this.reverse_animation();}
}
Animation.prototype.anim_step_forward = function()
{
this.current_frame += 1;
if(this.current_frame < this.frames.length){
this.set_frame(this.current_frame);
}else{
var loop_state = this.get_loop_state();
if(loop_state == "loop"){
this.first_frame();
}else if(loop_state == "reflect"){
this.last_frame();
this.reverse_animation();
}else{
this.pause_animation();
this.last_frame();
}
}
}
Animation.prototype.anim_step_reverse = function()
{
this.current_frame -= 1;
if(this.current_frame >= 0){
this.set_frame(this.current_frame);
}else{
var loop_state = this.get_loop_state();
if(loop_state == "loop"){
this.last_frame();
}else if(loop_state == "reflect"){
this.first_frame();
this.play_animation();
}else{
this.pause_animation();
this.first_frame();
}
}
}
Animation.prototype.pause_animation = function()
{
this.direction = 0;
if (this.timer){
clearInterval(this.timer);
this.timer = null;
}
}
Animation.prototype.play_animation = function()
{
this.pause_animation();
this.direction = 1;
var t = this;
if (!this.timer) this.timer = setInterval(function() {
t.anim_step_forward();
}, this.interval);
}
Animation.prototype.reverse_animation = function()
{
this.pause_animation();
this.direction = -1;
var t = this;
if (!this.timer) this.timer = setInterval(function() {
t.anim_step_reverse();
}, this.interval);
}
</script>
<style>
.animation {
display: inline-block;
text-align: center;
}
input[type=range].anim-slider {
width: 374px;
margin-left: auto;
margin-right: auto;
}
.anim-buttons {
margin: 8px 0px;
}
.anim-buttons button {
padding: 0;
width: 36px;
}
.anim-state label {
margin-right: 8px;
}
.anim-state input {
margin: 0;
vertical-align: middle;
}
</style>
<div class="animation">
<img id="_anim_img4237c18b00c24c268bf51aec8ee1f607">
<div class="anim-controls">
<input id="_anim_slider4237c18b00c24c268bf51aec8ee1f607" type="range" class="anim-slider"
name="points" min="0" max="1" step="1" value="0"
oninput="anim4237c18b00c24c268bf51aec8ee1f607.set_frame(parseInt(this.value));"></input>
<div class="anim-buttons">
<button title="Decrease speed" onclick="anim4237c18b00c24c268bf51aec8ee1f607.slower()">
<i class="fa fa-minus"></i></button>
<button title="First frame" onclick="anim4237c18b00c24c268bf51aec8ee1f607.first_frame()">
<i class="fa fa-fast-backward"></i></button>
<button title="Previous frame" onclick="anim4237c18b00c24c268bf51aec8ee1f607.previous_frame()">
<i class="fa fa-step-backward"></i></button>
<button title="Play backwards" onclick="anim4237c18b00c24c268bf51aec8ee1f607.reverse_animation()">
<i class="fa fa-play fa-flip-horizontal"></i></button>
<button title="Pause" onclick="anim4237c18b00c24c268bf51aec8ee1f607.pause_animation()">
<i class="fa fa-pause"></i></button>
<button title="Play" onclick="anim4237c18b00c24c268bf51aec8ee1f607.play_animation()">
<i class="fa fa-play"></i></button>
<button title="Next frame" onclick="anim4237c18b00c24c268bf51aec8ee1f607.next_frame()">
<i class="fa fa-step-forward"></i></button>
<button title="Last frame" onclick="anim4237c18b00c24c268bf51aec8ee1f607.last_frame()">
<i class="fa fa-fast-forward"></i></button>
<button title="Increase speed" onclick="anim4237c18b00c24c268bf51aec8ee1f607.faster()">
<i class="fa fa-plus"></i></button>
</div>
<form title="Repetition mode" action="#n" name="_anim_loop_select4237c18b00c24c268bf51aec8ee1f607"
class="anim-state">
<input type="radio" name="state" value="once" id="_anim_radio1_4237c18b00c24c268bf51aec8ee1f607"
>
<label for="_anim_radio1_4237c18b00c24c268bf51aec8ee1f607">Once</label>
<input type="radio" name="state" value="loop" id="_anim_radio2_4237c18b00c24c268bf51aec8ee1f607"
checked>
<label for="_anim_radio2_4237c18b00c24c268bf51aec8ee1f607">Loop</label>
<input type="radio" name="state" value="reflect" id="_anim_radio3_4237c18b00c24c268bf51aec8ee1f607"
>
<label for="_anim_radio3_4237c18b00c24c268bf51aec8ee1f607">Reflect</label>
</form>
</div>
</div>
<script language="javascript">