676 lines
12 KiB
JavaScript
676 lines
12 KiB
JavaScript
/* Copyright (C) 2013 Justin Windle, http://soulwire.co.uk */
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(function ( root, factory ) {
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if ( typeof exports === 'object' ) {
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// CommonJS like
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module.exports = factory(root, root.document);
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} else if ( typeof define === 'function' && define.amd ) {
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// AMD
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define( function() { return factory( root, root.document ); });
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} else {
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// Browser global
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root.Sketch = factory( root, root.document );
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}
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}( typeof window !== "undefined" ? window : this, function ( window, document ) {
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"use strict";
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/*
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----------------------------------------------------------------------
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Config
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----------------------------------------------------------------------
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*/
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let MATH_PROPS = 'E LN10 LN2 LOG2E LOG10E PI SQRT1_2 SQRT2 abs acos asin atan ceil cos exp floor log round sin sqrt tan atan2 pow max min'.split( ' ' );
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let HAS_SKETCH = '__hasSketch';
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let M = Math;
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let CANVAS = 'canvas';
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let WEBGL = 'webgl';
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let DOM = 'dom';
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let doc = document;
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let win = window;
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let instances = [];
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let defaults = {
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fullscreen: true,
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autostart: true,
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autoclear: true,
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autopause: true,
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container: doc.body,
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interval: 1,
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globals: true,
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retina: false,
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type: CANVAS
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};
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let keyMap = {
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8: 'BACKSPACE',
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9: 'TAB',
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13: 'ENTER',
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16: 'SHIFT',
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27: 'ESCAPE',
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32: 'SPACE',
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37: 'LEFT',
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38: 'UP',
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39: 'RIGHT',
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40: 'DOWN'
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};
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/*
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----------------------------------------------------------------------
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Utilities
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----------------------------------------------------------------------
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*/
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function isArray( object ) {
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return Object.prototype.toString.call( object ) == '[object Array]';
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}
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function isFunction( object ) {
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return typeof object == 'function';
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}
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function isNumber( object ) {
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return typeof object == 'number';
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}
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function isString( object ) {
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return typeof object == 'string';
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}
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function keyName( code ) {
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return keyMap[ code ] || String.fromCharCode( code );
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}
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function extend( target, source, overwrite ) {
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for ( let key in source )
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if ( overwrite || !( key in target ) )
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target[ key ] = source[ key ];
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return target;
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}
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function proxy( method, context ) {
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return function() {
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method.apply( context, arguments );
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};
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}
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function clone( target ) {
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let object = {};
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for ( let key in target ) {
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if ( key === 'webkitMovementX' || key === 'webkitMovementY' )
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continue;
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if ( isFunction( target[ key ] ) )
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object[ key ] = proxy( target[ key ], target );
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else
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object[ key ] = target[ key ];
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}
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return object;
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}
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/*
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----------------------------------------------------------------------
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Constructor
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----------------------------------------------------------------------
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*/
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function constructor( context ) {
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let request, handler, target, parent, bounds, index, suffix, clock, node, copy, type, key, val, min, max, w, h;
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let counter = 0;
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let touches = [];
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let resized = false;
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let setup = false;
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let ratio = win.devicePixelRatio || 1;
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let isDiv = context.type == DOM;
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let is2D = context.type == CANVAS;
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let mouse = {
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x: 0.0, y: 0.0,
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ox: 0.0, oy: 0.0,
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dx: 0.0, dy: 0.0
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};
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let eventMap = [
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context.eventTarget || context.element,
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pointer, 'mousedown', 'touchstart',
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pointer, 'mousemove', 'touchmove',
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pointer, 'mouseup', 'touchend',
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pointer, 'click',
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pointer, 'mouseout',
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pointer, 'mouseover',
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doc,
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keypress, 'keydown', 'keyup',
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win,
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active, 'focus', 'blur',
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resize, 'resize'
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];
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let keys = {}; for ( key in keyMap ) keys[ keyMap[ key ] ] = false;
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function trigger( method ) {
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if ( isFunction( method ) )
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method.apply( context, [].splice.call( arguments, 1 ) );
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}
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function bind( on ) {
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for ( index = 0; index < eventMap.length; index++ ) {
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node = eventMap[ index ];
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if ( isString( node ) )
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target[ ( on ? 'add' : 'remove' ) + 'EventListener' ].call( target, node, handler, false );
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else if ( isFunction( node ) )
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handler = node;
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else target = node;
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}
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}
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function update() {
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cAF( request );
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request = rAF( update );
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if ( !setup ) {
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trigger( context.setup );
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setup = isFunction( context.setup );
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}
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if ( !resized ) {
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trigger( context.resize );
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resized = isFunction( context.resize );
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}
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if ( context.running && !counter ) {
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context.dt = ( clock = +new Date() ) - context.now;
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context.millis += context.dt;
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context.now = clock;
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trigger( context.update );
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// Pre draw
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if ( is2D ) {
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if ( context.retina ) {
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context.save();
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if (context.autoclear) {
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context.scale( ratio, ratio );
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}
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}
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if ( context.autoclear )
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context.clear();
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}
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// Draw
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trigger( context.draw );
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// Post draw
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if ( is2D && context.retina )
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context.restore();
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}
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counter = ++counter % context.interval;
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}
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function resize() {
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target = isDiv ? context.style : context.canvas;
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suffix = isDiv ? 'px' : '';
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w = context.width;
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h = context.height;
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if ( context.fullscreen ) {
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h = context.height = win.innerHeight;
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w = context.width = win.innerWidth;
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}
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if ( context.retina && is2D && ratio ) {
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target.style.height = h + 'px';
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target.style.width = w + 'px';
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w *= ratio;
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h *= ratio;
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}
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if ( target.height !== h )
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target.height = h + suffix;
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if ( target.width !== w )
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target.width = w + suffix;
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if ( is2D && !context.autoclear && context.retina )
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context.scale( ratio, ratio );
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if ( setup ) trigger( context.resize );
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}
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function align( touch, target ) {
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bounds = target.getBoundingClientRect();
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touch.x = touch.pageX - bounds.left - (win.scrollX || win.pageXOffset);
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touch.y = touch.pageY - bounds.top - (win.scrollY || win.pageYOffset);
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return touch;
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}
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function augment( touch, target ) {
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align( touch, context.element );
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target = target || {};
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target.ox = target.x || touch.x;
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target.oy = target.y || touch.y;
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target.x = touch.x;
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target.y = touch.y;
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target.dx = target.x - target.ox;
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target.dy = target.y - target.oy;
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return target;
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}
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function process( event ) {
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event.preventDefault();
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copy = clone( event );
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copy.originalEvent = event;
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if ( copy.touches ) {
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touches.length = copy.touches.length;
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for ( index = 0; index < copy.touches.length; index++ )
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touches[ index ] = augment( copy.touches[ index ], touches[ index ] );
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} else {
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touches.length = 0;
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touches[0] = augment( copy, mouse );
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}
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extend( mouse, touches[0], true );
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return copy;
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}
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function pointer( event ) {
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event = process( event );
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min = ( max = eventMap.indexOf( type = event.type ) ) - 1;
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context.dragging =
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/down|start/.test( type ) ? true :
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/up|end/.test( type ) ? false :
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context.dragging;
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while( min )
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isString( eventMap[ min ] ) ?
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trigger( context[ eventMap[ min-- ] ], event ) :
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isString( eventMap[ max ] ) ?
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trigger( context[ eventMap[ max++ ] ], event ) :
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min = 0;
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}
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function keypress( event ) {
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key = event.keyCode;
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val = event.type == 'keyup';
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keys[ key ] = keys[ keyName( key ) ] = !val;
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trigger( context[ event.type ], event );
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}
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function active( event ) {
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if ( context.autopause )
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( event.type == 'blur' ? stop : start )();
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trigger( context[ event.type ], event );
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}
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// Public API
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function start() {
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context.now = +new Date();
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context.running = true;
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}
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function stop() {
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context.running = false;
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}
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function toggle() {
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( context.running ? stop : start )();
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}
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function clear() {
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if ( is2D )
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context.clearRect( 0, 0, context.width * ratio, context.height * ratio );
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}
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function destroy() {
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parent = context.element.parentNode;
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index = instances.indexOf( context );
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if ( parent ) parent.removeChild( context.element );
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if ( ~index ) instances.splice( index, 1 );
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bind( false );
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stop();
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}
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extend( context, {
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touches: touches,
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mouse: mouse,
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keys: keys,
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dragging: false,
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running: false,
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millis: 0,
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now: NaN,
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dt: NaN,
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destroy: destroy,
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toggle: toggle,
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clear: clear,
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start: start,
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stop: stop
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});
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instances.push( context );
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return ( context.autostart && start(), bind( true ), resize(), update(), context );
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}
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/*
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----------------------------------------------------------------------
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Global API
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----------------------------------------------------------------------
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*/
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let element, context, Sketch = {
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CANVAS: CANVAS,
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WEB_GL: WEBGL,
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WEBGL: WEBGL,
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DOM: DOM,
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instances: instances,
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install: function( context ) {
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if ( !context[ HAS_SKETCH ] ) {
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for ( let i = 0; i < MATH_PROPS.length; i++ )
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context[ MATH_PROPS[i] ] = M[ MATH_PROPS[i] ];
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extend( context, {
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TWO_PI: M.PI * 2,
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HALF_PI: M.PI / 2,
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QUARTER_PI: M.PI / 4,
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random: function( min, max ) {
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if ( isArray( min ) )
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return min[ ~~( M.random() * min.length ) ];
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if ( !isNumber( max ) )
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max = min || 1, min = 0;
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return min + M.random() * ( max - min );
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},
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lerp: function( min, max, amount ) {
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return min + amount * ( max - min );
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},
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map: function( num, minA, maxA, minB, maxB ) {
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return ( num - minA ) / ( maxA - minA ) * ( maxB - minB ) + minB;
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}
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});
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context[ HAS_SKETCH ] = true;
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}
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},
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create: function( options ) {
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options = extend( options || {}, defaults );
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if ( options.globals ) Sketch.install( self );
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element = options.element = options.element || doc.createElement( options.type === DOM ? 'div' : 'canvas' );
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context = options.context = options.context || (function() {
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switch( options.type ) {
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case CANVAS:
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return element.getContext( '2d', options );
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case WEBGL:
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return element.getContext( 'webgl', options ) || element.getContext( 'experimental-webgl', options );
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case DOM:
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return element.canvas = element;
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}
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})();
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( options.container || doc.body ).appendChild( element );
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return Sketch.augment( context, options );
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},
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augment: function( context, options ) {
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options = extend( options || {}, defaults );
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options.element = context.canvas || context;
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options.element.className += ' sketch';
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extend( context, options, true );
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return constructor( context );
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}
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};
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/*
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----------------------------------------------------------------------
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Shims
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----------------------------------------------------------------------
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*/
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let vendors = [ 'ms', 'moz', 'webkit', 'o' ];
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let scope = self;
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let then = 0;
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let a = 'AnimationFrame';
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let b = 'request' + a;
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let c = 'cancel' + a;
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let rAF = scope[ b ];
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let cAF = scope[ c ];
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for ( let i = 0; i < vendors.length && !rAF; i++ ) {
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rAF = scope[ vendors[ i ] + 'Request' + a ];
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cAF = scope[ vendors[ i ] + 'Cancel' + a ];
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}
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scope[ b ] = rAF = rAF || function( callback ) {
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let now = +new Date();
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let dt = M.max( 0, 16 - ( now - then ) );
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let id = setTimeout( function() {
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callback( now + dt );
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}, dt );
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then = now + dt;
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return id;
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};
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scope[ c ] = cAF = cAF || function( id ) {
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clearTimeout( id );
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};
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/*
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----------------------------------------------------------------------
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Output
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----------------------------------------------------------------------
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*/
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return Sketch;
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}));
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let i = 0;
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const stabs = document.getElementById('stabs').value
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let blood = Sketch.create({autoclear: false, autopause: false}),
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drops = [],
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dropCount = stabs*4,
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maxDrops = dropCount+1,
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Drop = function() {
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this.x = random(0,blood.width);
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this.radius = random(7,12);
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this.y = -this.radius - random(50,100);
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this.vy = this.radius/6;
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this.r = ~~random(240,255);
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this.g = ~~random(0,20);
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this.b = ~~random(0,20);
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};
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blood.update = function() {
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let d = drops.length;
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while(d < dropCount && i < maxDrops) {
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let drop = new Drop();
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drops.push(drop);
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d++;
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i++;
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}
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while(d-- && i < maxDrops) {
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let drop = drops[d];
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drop.y += drop.vy;
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if(drop.y - drop.radius > blood.height) {
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drops.splice(d,1);
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}
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}
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}
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blood.draw = function() {
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let d = drops.length;
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while(d-- && i < maxDrops) {
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let drop = drops[d];
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blood.beginPath();
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blood.fillStyle = 'rgba('+drop.r+','+drop.g+','+drop.b+',.8)';
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blood.arc(drop.x,drop.y,drop.radius,0,TWO_PI);
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blood.fill();
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}
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}
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