Created
July 31, 2014 09:42
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Draw a straight line using mouse
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| <!DOCTYPE HTML> | |
| <meta charset='utf-8'> | |
| <style> | |
| body { | |
| background: rgb(200,200,200); | |
| } | |
| svg { | |
| margin: auto; | |
| display: block; | |
| background: white; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="draw-a-line.js"></script> | |
| <script> | |
| var mainw = 960, | |
| mainh = 500; | |
| d3.select('body').append('svg') | |
| .attr('width', mainw) | |
| .attr('height', mainh); | |
| function draw(selection){ | |
| var xy0, | |
| path, | |
| keep = false, | |
| line = d3.svg.line() | |
| .x(function(d){ return d[0]; }) | |
| .y(function(d){ return d[1]; }); | |
| selection | |
| .on('mousedown', function(){ | |
| keep = true; | |
| xy0 = d3.mouse(this); | |
| path = d3.select('svg') | |
| .append('path') | |
| .attr('d', line([xy0, xy0])) | |
| .style({'stroke': 'black', 'stroke-width': '1px'}); | |
| }) | |
| .on('mouseup', function(){ | |
| keep = false; | |
| }) | |
| .on('mousemove', function(){ | |
| if (keep) { | |
| Line = line([xy0, d3.mouse(this).map(function(x){ return x - 1; })]); | |
| console.log(Line); | |
| path.attr('d', Line); | |
| } | |
| }); | |
| } | |
| d3.select('svg').append('rect') | |
| .attr('x', 0) | |
| .attr('y', 0) | |
| .attr('width', mainw) | |
| .attr('height', mainh) | |
| .style({'fill': 'white'}) | |
| .call(draw); | |
| </script> | |
| </body> |
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