javascript - using snap.svg to move by increment using keyboard arrows -


i trying move svg called mycurser not position. objective move shapes along grid, in case 40x40. later increment changed dynamicly.

i know can move to , specify new cx svg. cannot write cx = cx + 40.

codepen

var s = snap("#svg"); var mycurser = s.circle(0, 0, 10); //var mycurser2 = s.circle(40,40,2)  mycurser.attr({     fill: "rgba(255,0,0,0.5)",     stroke: "#000",     strokewidth: 1   });  var increment = 40;  $(document).keydown(function(e) {   switch(e.which) {     case 37: // left     break;     case 38: //    break;     case 39: // right     mycurser.transform(t'40','40');     break;     case 40: // down    break;     default: return; // exit handler other keys    }    e.preventdefault(); // prevent default action (scroll / move caret) });

here's answer gave in email...

you want like...

mycurser.attr('cx', +mycurser.attr('cx') + 10)

note, + in there, make sure doesn't add string, , adds number.

you add plugin that, may bit confusing, useful if have repeat code. plugin like...

snap.plugin( function( snap, element, paper, global ) {    element.prototype.increaseattr = function(myattr, value) {       return this.attr(myattr, +this.attr(myattr) + value);    } });   mycurser.increaseattr('cx', -10) //// move left

here's codepen 1 method moving right, , left.

codepen

you may want transforms if moving more complicated objects around.


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