D3.js transform.invertX() Function
The transform.invertX() Function in D3.js is used to get the inverse transformation of the specified x-coordinate, (x – tx) / k.
Syntax:
transform.invertX(x)
Parameters: This function accepts the following parameter as mentioned above and described below:
- x: This parameter is the x-coordinate.
Return Value: This function returns the transformed zoom behavior.
Below programs illustrate the transform.invertX() function in D3.js.
Example 1:
<!DOCTYPE html><html> <head> <meta charset="utf-8"> </script> <script src= </script></head> <body> <center> <h1 style="color: green;"> Geeksforgeeks </h1> <h3>D3.js | transform.invertX() Function</h3> <svg width="300" height="300"> <g> <image xlink: href= x="150" y="150" width="50" height="50"> </image> </g> </svg> <script> var zoom = d3.zoom() .on("zoom", zoomed) .constrain(constr); var svg = d3.select("svg").call(zoom), g = svg.select("g"), image = g.select("image"), width = +svg.attr("width"), height = +svg.attr("height"), x0 = +image.attr("x"), y0 = +image.attr("y"), x1 = +image.attr("width") + x0, y1 = +image.attr("height") + y0; zoom.scaleExtent([1, Math.min(width / (x1 - x0), height / (y1 - y0))]); function zoomed() { var t = d3.event.transform; if (t.invertX(0) > x0) t.x = -x0 * t.k; else if (t.invertX(width) < x1) t.x = width - x1 * t.k; if (t.invertY(0) > y0) t.y = -y0 * t.k; else if (t.invertY(height) < y1) t.y = height - y1 * t.k; g.attr("transform", t); } function constr(transform, extent, translateExtent) { var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0], dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1], dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0], dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1]; return transform.translate( dx1 > dx0 ? (dx1 + dx0) / 2 : Math.min(0, dx0) || Math.max(0, dx1), dy1 > dy0 ? (dy1 + dy0) / 2 : Math.min(0, dy0) || Math.max(0, dy1) ); } </script> </center></body> </html> |
Output:
Example 2:
<!DOCTYPE html><html> <head> <meta charset="utf-8"> </script> <style> circle { opacity: 0.7; } </style></head> <body> <center> <h1 style="color: green;"> Geeksforgeeks </h1> <h3>D3.js | zoom.invertX() Function</h3> <svg></svg> <script> function getRandom(min, max) { min = Math.ceil(min); max = Math.floor(max); return Math.floor(Math.random() * (max - min + 1)) + min; } function mydata(transform, extent, translateExtent) { var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0], dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1], dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0], dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1]; return transform.translate( dx1 > dx0 ? (dx1 + dx0) / 2 : Math.min(0, dx0) || Math.max(0, dx1), dy1 > dy0 ? (dy1 + dy0) / 2 : Math.min(0, dy0) || Math.max(0, dy1) ); } var dimension = document.body .getBoundingClientRect(); var radius = 10; var svg = d3.select('svg'); var data = d3.range(0, 50).map(function () { return { x: getRandom(radius, 400 - radius), y: getRandom(radius, 200 - radius) } }); var zoom = d3.zoom() .constrain(mydata) .on('zoom', function () { canvas.attr('transform', d3.event.transform); }) var canvas = svg.attr('width', 400) .attr('height', 200) .call(zoom) .insert('g', ':first-child'); canvas.selectAll('circle') .data(data) .enter() .append('circle') .attr('r', radius) .attr('cx', function (d) { return d.x; }) .attr('cy', function (d) { return d.y; }) .style('fill', function () { return d3.schemeCategory10[getRandom(0, 5)] }); </script> </center></body> </html> |
Output:
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