A demonstration of handling multitouch events using D3. Requires a touch-supporting browser, such as iOS Safari.
forked from mbostock's block: Multitouch
Last active
November 28, 2016 23:53
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triple touch
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="initial-scale=1,maximum-scale=1"> | |
| <style> | |
| html,body {height: 100%;} | |
| body {margin: 0;} | |
| svg { | |
| display: block; | |
| overflow: hidden; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| <body> | |
| <!-- | |
| <g id="edges"> | |
| <g id="outputs_0"> | |
| <path d="M" id="edge_0_1" title="loves"/> | |
| </g> | |
| </g> | |
| <g id="nodes"> | |
| <circle cx="20" cy="20" r="10" id="node_0" title="steltenpower"/> | |
| <circle cx="100" cy="100" r="10" id="node_1" title="web"/> | |
| </g> | |
| <g id="edgeNames"> | |
| <text x="60" y="60">loves</text> | |
| </g> | |
| <g id="NodeNames"> | |
| <text x="20" y="20">steltenpower</text> | |
| <text x="100" y="100">web</text> | |
| </g> | |
| // http://bl.ocks.org/tmcw/4444952 | |
| --> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var svg = d3.select("body").append("svg").attr("width",innerWidth).attr("height", innerHeight) | |
| .on("touchstart",touch).on("touchmove",touch).on("touchend",touch);; | |
| //var color = d3.scale.linear().domain([0,1,2]).range(['red','green','blue']); | |
| var state="0base"; | |
| //var nodes=[]; // 1 node = elm_incl_cx_cy_id_title, [{relation,destinationId}] | |
| function touch() { | |
| d3.event.preventDefault(); | |
| /* | |
| clear | |
| touch0 (and back up) : if eventOnNode get i in nodes array, otherwise i=nodes.length; Node[i].x=event.x; Node[i].y=event.y; | |
| reading nodeNameA : changing nodes[i].name | |
| touch1 (and back up) / touch0up==>touch0=touch1; : if eventOnNode get i in nodes array, otherwise i=nodes.length; Node[i].x=event.x; Node[i].y=event.y; / | |
| reading relationName | |
| touch2 (and back up) | |
| reading nodeNameB | |
| */ | |
| switch (state) { | |
| case "0base": | |
| if ((event.target.type=="circle")&&(event.type==touchstart)){ | |
| A=event.target; | |
| }else A=new Circle(event.x,event.y); // take id of last node, add 1 | |
| state="1start"; | |
| // create txtA=textfield(A.name) and give it focus | |
| break; | |
| case "1Start": | |
| if ((event.target.type=="circle")&&(event.type==touchend)){ | |
| A.name=txtA.value; //and hide txtA | |
| state="0base"; | |
| }else{ | |
| if (event.type=touchstart){ | |
| if (event.target.type=="circle") B=event.target; | |
| else B=new Circle(event.x,event.y) // take id of last node, add 1 | |
| // add edge (A,B) | |
| state="2go" | |
| // create txtR=textfield and give it focus | |
| } | |
| } | |
| break; | |
| case "2go": | |
| if ((event.target.type=="circle")&&(event.type==touchend)){ | |
| //edges(A,B,txtRel.value); //hide txtRel | |
| state="1start"; | |
| }else{ | |
| if (event.type=touchstart){ | |
| if (event.target.type=="circle") B=new Circle(event.x,event.y); // take id of last node, add 1 | |
| nodes[A].edges.push(B,"") | |
| } | |
| state="2go" | |
| // create txtR=textfield and give it focus | |
| } | |
| } | |
| break; | |
| case "3end": | |
| break; | |
| default: | |
| console.log("this code should never be reached"); | |
| break; | |
| } | |
| circle = circle | |
| .data(d3.touches(svg.node()), function(d) { return d.identifier; }); | |
| circle.enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 36) | |
| .style("fill", function(d) { return color(d.identifier); }) | |
| .transition() | |
| .duration(500) | |
| .ease("elastic") | |
| .attr("r", 48); | |
| circle | |
| .attr("cx", function(d) { return d[0]; }) | |
| .attr("cy", function(d) { return d[1]; }) | |
| .on("touchstart",touch).on("touchmove",touch).on("touchend",touch); | |
| } | |
| </script> |
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