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August 29, 2015 14:06
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A simple physics console animation in JS.
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| var stop = false; | |
| var loop = function (d) { | |
| if (stop){ | |
| return; | |
| } | |
| if (d == undefined) { | |
| var d = { | |
| width: 30, | |
| height: 30, | |
| x: 0, | |
| y: 29, | |
| dx: 2, | |
| dy: 0, | |
| f: .99, | |
| r: .7 | |
| }; | |
| } | |
| // Adjust velocity | |
| if (d.y > 0){ | |
| d.dy -= .1; | |
| } | |
| d.dx *= d.f; | |
| // Update position | |
| d.x += d.dx; | |
| d.y += d.dy; | |
| if (d.x < 0) d.x = 0; | |
| if (d.x >= d.width) d.x = d.width-1; | |
| if (d.y < 0) d.y = 0; | |
| if (d.y >= d.height) d.y = d.height-1; | |
| // Bounce | |
| if (d.y <= 0 || d.y >= d.height-1){ | |
| d.dy *= -d.r; | |
| } | |
| if (d.x <= 0 || d.x >= d.width-1){ | |
| d.dx *= -d.r; | |
| } | |
| var frame = '' | |
| for (var y = d.height-1; y >= 0; y--) { | |
| for (var x = 0; x < d.width; x++) { | |
| frame += ' ' + ((x == Math.floor(d.x) && y == Math.floor(d.y)) ? '#' : ' '); | |
| } | |
| frame += '\n'; | |
| } | |
| if (d.frame != frame) { | |
| d.frame = frame; | |
| console.log(d.frame); | |
| } | |
| setTimeout( | |
| (function (d) { | |
| return function () { | |
| loop(d); | |
| } | |
| })(d), | |
| 100 | |
| ) | |
| } | |
| loop(); |
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| <body onload="y=p=29;c=2;u=x=a=0;setInterval(function(){x+=c*=.99*(x<=0|x>=p?-.7:1);x=x<0?0:x>=30?p:x;u*=y<=0|y>=p?-.7:1;y+=u-=y>0?.1:0;y=y<0?0:y>=30?p:y;for(i=30,o='';i--;)for(v=~~x,o+='\n';v--;)o+=' '+' #'[!v&i==~~y];if(o!=a)console.log(a=o)},99)"> |
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