The bar's text is positioned using its computed size to determine if it fits in the bar. Slide the input to change the bar width and the text position.
Created
August 4, 2016 05:57
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Computed Text Placement
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| <!doctype html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| input { | |
| position: absolute; | |
| } | |
| text { | |
| font-family: sans-serif; | |
| font-size: 12px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var margin = {top: 10, left: 10, bottom: 10, right: 10}, | |
| height = 500 - margin.top - margin.bottom, | |
| width = 960 - margin.left - margin.right, | |
| barHeight = 50; | |
| var chart = d3.select('body').append('svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom) | |
| .append('g') | |
| .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')'); | |
| chart.append('rect') | |
| .attr('x', 0) | |
| .attr('y', height / 2 - barHeight / 2) | |
| .attr('width', width) | |
| .attr('height', barHeight) | |
| .style('stroke', 'black') | |
| .style('fill', 'transparent'); | |
| var bar = chart.append('rect') | |
| .attr('x', 0) | |
| .attr('y', height / 2 - barHeight / 2) | |
| .attr('width', .5 * width) | |
| .attr('height', barHeight) | |
| .style('fill', 'steelblue'); | |
| var text = chart.append('text') | |
| .attr('y', height / 2 + 6); | |
| d3.select('body').append('input') | |
| .attr('type', 'range') | |
| .style('left', margin.left - 1 + 'px') | |
| .style('top', height / 2 + barHeight + 'px') | |
| .style('width', width + 'px') | |
| .on('input', function() { | |
| update(this.value * 0.01); | |
| }); | |
| update(0.5); | |
| function update(percent) { | |
| var fits = text.node().getBBox().width + 5 < percent * width; | |
| text | |
| .transition().duration(50) | |
| .attr('x', percent * width) | |
| .attr('dx', fits ? -5 : 5) | |
| .style('text-anchor', fits ? 'end' : 'start') | |
| .style('fill', fits ? 'white' : 'black') | |
| .text('This bar is ' + d3.format('.0f')(percent * 100) + '% filled'); | |
| bar | |
| .transition().duration(50) | |
| .attr('width', percent * width); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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