JavaScript

语言：

JaveScriptBabelCoffeeScript

确定

var mycode = function() {

'use strict';

var testTicker = Date.now(),

testTime = testTicker,

testNow,

testMessage = document.getElementById('testmessage');

var pad = scrawl.pad.myCanvas,

tweenCounter = 0,

buildStar, addStars,

template;

scrawl.cell[pad.base].set({

backgroundColor: 'black'

})

template = scrawl.makeWheel({

name: 'templateStar',

radius: 4,

fillStyle: 'lightGrey',

scaleOutline: false,

visibility: false,

startX: 300,

startY: 300,

scale: 0.1,

});

buildStar = function(requiredTweens) {

var rand1, rand2, rand3, fast,

x, y, scale, duration, star;

for (var i = 0; i < requiredTweens; i++) {

rand1 = Math.random();

rand2 = Math.round(Math.random() * 600);

rand3 = Math.random();

if (rand1 < 0.25) {

x = 0;

y = rand2;

} else if (rand1 < 0.5) {

x = 600;

y = rand2;

} else if (rand1 < 0.75) {

x = rand2;

y = 0;

} else {

x = rand2;

y = 600;

}

duration = Math.round((rand3 * 3000) + 1000);

scale = 0.5 + ((1 - rand3) * 1.4);

fast = (tweenCounter) ? true : false;

star = template.clone({

name: 'b' + tweenCounter,

fastStamp: fast,

visibility: true,

createNewContext: false

});

scrawl.makeTween({

name: star.name + '_tween',

targets: star,

duration: duration,

cycles: 0,

definitions: [{

attribute: 'startX',

start: 300,

end: x

}, {

attribute: 'startY',

start: 300,

end: y

}, {

attribute: 'scale',

start: 0.1,

end: scale

}]

}).run();

tweenCounter++;

}

}

buildStar(100);

addStars = function() {

buildStar(100);

}

scrawl.addListener('up', addStars, scrawl.canvas.myCanvas);

scrawl.makeAnimation({

fn: function() {

scrawl.render();

testNow = Date.now();

testTime = testNow - testTicker;

testTicker = testNow;

testMessage.innerHTML = 'Stars: ' + tweenCounter + '; milliseconds per screen refresh: ' + Math.ceil(testTime) + '; fps: ' + Math.floor(1000 / testTime);

},

});

};

scrawl.loadExtensions({

path: '/uploads/170101/',

extensions: ['animation', 'wheel', 'images'],

callback: function() {

window.addEventListener('load', function() {

scrawl.init();

mycode();

}, false);

},

});