2D Matrix Demo

by dchudz

HTML

<script src="http://mbostock.github.com/d3/d3.js?2.7.1"></script>
<div class = matrixformd>
<form>
<div align="left">
  Transformation:<br>
<input class = "matrix" type="text" size="3" value="1" id="a"><input class = "matrix" type="text" size="3" value="0" id="b"><br>
<input class = "matrix" type="text" size="3" value="0" id="c"><input class = "matrix" type="text" size="3" value="1" id="d">

<a href="#" id="reset">Reset</a>

</div>
</form>
</div>

<div id="plane1div" class="planediv"></div>
<div id="plane2div" class="planediv"></div>

CSS

body {
  font: 16px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
.overlay {
  fill: "black";
  opacity: .5;
  pointer-events: all;
}
.dot {
  stroke: #000;
}

.planediv {
  width:50%;
  float:left;
  height:1000px;
}

JavaScript

var margin = {top: 20, right: 20, bottom: 20, left: 20},
    width = 800 - margin.left - margin.right,
    height = 800 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .range([0, width]).domain([-10,10]);

var y = d3.scale.linear()
    .range([height, 0]);


function makePlane(addTo, offsetX, offsetY) {

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

  marginLeft = margin.left + offsetX;
  marginTop  = margin.top + offsetY;

var svg = d3.select(addTo).append("svg")
  .append("g")
    .attr("transform", "translate(" + marginLeft  + "," + marginTop + ")");


  x.domain([-10,10]).nice();
  y.domain([-10,10]).nice();

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis).attr("transform", "translate(0," + height/2 + ")")
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("x");

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis).attr("transform", "translate(" + width/2 + ",0)")
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("y")
return svg 
};

function mouseclick() {
    xClick = x.invert(d3.mouse(this)[0]);
    yClick = y.invert(d3.mouse(this)[1]);
    point = [xClick, yClick];
    addPoint(point);
  }

function drag() {
    xClick = x.invert(d3.event.x);  //d3.mouse(this)[0]);
    yClick = y.invert(d3.event.y);  //d3.mouse(this)[1]);
    point = [xClick, yClick];
    addPoint(point);  
  }

function reset() {
  d3.selectAll(".dot").remove();
  points=[];
}

function multiply(M, point) {
  var Mx = M.a*point[0] + M.b*point[1];
  var My = M.c*point[0] + M.d*point[1];
  return [Mx, My];
}

function addPoint(point) {
      point1 =...