D3 Bounded Zoom

This D3 example demonstrates using the zoom event and limits the bounds of the zooming to a specified domain. It is largely based on /jasondavies/3689931, but with bounds. Most of this bounding is done in the refresh function. You need to zoom in before you can pan or zoom out.

forked from tommct's block: D3 Bounded Zoom

<!DOCTYPE html>
<meta charset="utf-8">
<title>Constrained Zoom by Rectangle</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>

body {
  font-family: sans-serif;
}

.noselect {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

svg {
  font: 9pt sans-serif;
  shape-rendering: crispEdges;
}

rect {
  fill: #ddd;
}

rect.zoom {
  stroke: steelblue;
  fill: #bbb;
  fill-opacity: 0.5;
}

.axis path, .axis line {
  fill: none;
  stroke: #fff;
}

</style>
<p><label for="zoom-rect"><input type="checkbox" id="zoom-rect"> zoom by rectangle</label>
<script>

var margin = {top: 0, right: 12, bottom: 20, left: 60},
    width = 960 - margin.left - margin.right,
    height = 430 - margin.top - margin.bottom;

var xmin = 0,
    xmax = 500,
    ymin = 0,
    ymax = 1000;

var x = d3.scaleLinear()
    .domain([xmin+.5, xmax+.5])
    .range([0.5, width+.5]);

var y = d3.scaleLinear()
    .domain([ymin+.5, ymax+.5])
    .range([height+.5, 0.5]);

var xAxis = d3.axisBottom()
    .scale(x)
    .tickSize(-height);

var yAxis = d3.axisLeft()
    .scale(y)
    .ticks(5)
    .tickSize(-width); // tickLine == gridline

var refresh = function() {
  var reset_s = 0;
  //var zt = d3.event.transform;
  
  //console.log(zt);

if ((x.domain()[1] - x.domain()[0]) >= (xmax - xmin)) {
    //zoom.x(x.domain([xmin, xmax]));
    
    reset_s = 1;
  }
  
  if ((y.domain()[1] - y.domain()[0]) >= (ymax - ymin)) {
    //zoom.y(y.domain([ymin, ymax]));
    reset_s += 1;
  }
  
  if (reset_s == 2) { // Both axes are full resolution. Reset.
    zoom.transform(d3.select("#main"), d3.zoomIdentity);
  }
  else {
    if (x.domain()[0] < xmin) {
      x.domain([xmin, x.domain()[1] - x.domain()[0] + xmin]);
    }
    if (x.domain()[1] > xmax) {
      var xdom0 = x.domain()[0] - x.domain()[1] + xmax;
      x.domain([xdom0, xmax]);
    }
    if (y.domain()[0] < ymin) {
      y.domain([ymin, y.domain()[1] - y.domain()[0] + ymin]);
    }
    if (y.domain()[1] > ymax) {
      var ydom0 = y.domain()[0] - y.domain()[1] + ymax;
      y.domain([ydom0, ymax]);
    }
  }
  svg.select(".x.axis").call(xAxis);
  svg.select(".y.axis").call(yAxis);
}

var zoom = d3.zoom()
		.scaleExtent([.001, Infinity]).on("zoom", refresh);

var zoomRect = false;

d3.select("#zoom-rect").on("change", function() {
      zoomRect = this.checked;
    });

//var dx = m[0] - origin[0];
        			//var dy = m[1] - origin[1];
        			//var x = (origin[0] + m[0]) / 2;
        			//var y = (origin[1] + m[1]) / 2;
              
              //var scale = Math.max(width / dx, height / dy);
        			//var translate = [width / 2 - scale * x, height / 2 - scale * y];
              
              //var zt = d3.zoomIdentity
            	//		.scale(scale)
            	//		.translate(-origin[0], translate[1]);
              
              //zoom.transform(d3.select("#main"), zt)
              
            }
            rect.remove();
            refresh();
          }, true);
      d3.event.stopPropagation();
    });

svg.append("rect")
    .attr("width", width)
    .attr("height", height);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);
</script>

Modified http://d3js.org/d3.v4.min.js to a secure url

https://d3js.org/d3.v4.min.js