Created
October 10, 2011 21:11
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viewBox space coordinate transformation
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Aspect Ratio</title> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.3.0"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.3.0"></script> | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript"> | |
| var make_point = function(element, xy) | |
| { | |
| console.log(element); | |
| //var matrix = element.getCTM(); | |
| //var matrix = element.getScreenCTM(); | |
| var p = element.nearestViewportElement.createSVGPoint(); | |
| var matrix = element.getTransformToElement(element.nearestViewportElement); | |
| p.x = xy[0]; | |
| p.y = xy[1]; | |
| var sp = p.matrixTransform(matrix); | |
| return sp; | |
| } | |
| var box_example = function(w, h) | |
| { | |
| //setup svg canvas | |
| var svg = d3.select("#chart") | |
| .append("svg:svg") | |
| //.attr("width", "1000") | |
| //.attr("height", "700") | |
| //Aspect ratio intentionally skewed | |
| .attr("width", w) | |
| .attr("height", h) | |
| .attr("viewBox", "0 0 400 400") | |
| .attr("preserveAspectRatio", "xMinYMin meet") | |
| .attr("id", "charts"); | |
| svg.append("svg:rect") | |
| .attr("width", "100%") | |
| .attr("height", "100%") | |
| .attr("stroke", "#000") | |
| .attr("stroke-width", 1) | |
| .attr("fill", "none") | |
| var mybox = svg.append("svg:rect") | |
| .attr("width", 200) | |
| .attr("height", 200) | |
| .attr("transform", "translate(100,100)") | |
| .attr("fill", "#00ff00") | |
| .attr("fill-opacity", .8) | |
| .attr("stroke", "#000") | |
| .attr("stroke-width", 5) | |
| .attr("stroke-opacity", .6) | |
| var boxnode = mybox.node(); | |
| var bbox = boxnode.getBBox(); | |
| console.log(bbox); | |
| var topleft = make_point(boxnode, [bbox.x, bbox.y]); | |
| var circle = svg.append("svg:circle") | |
| .attr("cx", topleft.x) | |
| .attr("cy", topleft.y) | |
| .attr("r", 20) | |
| .attr("stroke", "none") | |
| .attr("fill", "#ff0000") | |
| .attr("fill-opacity", .6) | |
| } | |
| //1 to 1 between screen pixels and viewBox | |
| box_example(400, 400); | |
| //skewed | |
| box_example(500, 320); | |
| </script> | |
| </body> | |
| </html> |
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