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simpledraw-14.html
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<doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>SimpleDraw</title>
<style>
/*
HTML
*/
body {
background: gainsboro;
padding: 0;
margin: 0;
}
h1 {
text-transform: capitalize;
font-size: 1.5em;
font-family: Impact, sans-serif;
margin: 0;
color: #1F497D;
}
section {
/*border: thin gray solid;*/
height: 100%
}
section#controls {
float: left;
padding: 0 0.5em;
}
section#drawing-area {
float: left;
padding: 0;
margin: 0;
}
fieldset {
font-family: Impact, sans-serif;
border: 2px solid #1F497D;
border-radius: 2px;
margin-bottom: 0.5em
}
fieldset legend {
background: #1F497D;
color: #fff;
padding: 1px 5px;
font-size: 1em;
border-radius: 2px;
margin-left: -12px;
}
button {
font-family: Impact, sans-serif;
background-color: #1F497D;
color: #fff;
padding: 1px 5px;
font-size: 1em;
border-radius: 2px;
text-decoration: none;
border: none;
box-shadow: 1px 1px 2px #777;
display: block;
width: 6em;
margin: 0.25em
}
button:hover, button:focus {
box-shadow: 2px 2px 4px #777;
}
button:active {
box-shadow: 0px 0px 1px #777;
}
button[aria-pressed="true"] {
color: #1F497D;
background-color: #fff;
}
/*
SVG
*/
svg {
width: 580px;
height: 580px;
background: white; /* Note that this only works for the SVG root */
}
*[role="button"] {
stroke: indigo;
fill: violet;
stroke-width: 1px;
}
*[role="button"] text {
font-size: 12px;
font-family: Verdana, sans-serif;
text-anchor: middle;
stroke: none;
fill: indigo;
pointer-events: none;
}
*[aria-pressed="true"] rect {
stroke-width: 3px;
}
svg#canvas {
/* pointer-events: all; */
}
rect#backdrop {
fill: url(#grid100);
stroke: gray;
}
</style>
<script>
window.onload = function () {
var svgrooot = document.getElementById("simpledraw");
var dnd = new simpledrawObj(svgrooot);
dnd.init();
}
function simpledrawObj(svgrooot) {
this.root = svgrooot;
this.backdrop = this.root.getElementById("backdrop");
this.canvas = this.root.getElementById("canvas");
this.activeEl = null;
this.points = null;
this.buttons = null;
this.mode = "draw-dot";
this.coords = this.root.createSVGPoint();
this.originpoint = this.root.createSVGPoint();
// constants
this.svgns = "http://www.w3.org/2000/svg";
this.xlinkns = "http://www.w3.org/1999/xlink";
}
simpledrawObj.prototype.init = function (){
this.root.addEventListener('click', bind(this, this.draw), false );
this.root.addEventListener('mousedown', bind(this, this.grab), false );
this.root.addEventListener('mousemove', bind(this, this.drag), false );
this.root.addEventListener('mouseup', bind(this, this.drop), false );
this.buttons = document.querySelectorAll("button");
for (var b = 0, bLen = this.buttons.length; bLen > b; ++b) {
var eachButton = this.buttons[b];
eachButton.addEventListener('click', bind(this, this.handleButtons), false );
}
}
/*
// draw
*/
simpledrawObj.prototype.draw = function (event){
if ( this.backdrop == event.target || this.canvas == event.target.parentNode ) {
// adjust coords
this.coords = localCoords(event, this.backdrop, this.root);
//console.log(event.detail)
if (2 == event.detail){
this.reset();
} else {
switch (this.mode) {
case "draw-dot":
this.drawDot(event);
break;
case "draw-polyline":
var style = "fill:cornflowerblue; ";
style += "stroke:cornflowerblue; ";
style += "stroke-width:1px; ";
style += "stroke-linecap:round; ";
style += "stroke-linejoin:round; ";
style += "fill-opacity:0.5; ";
this.drawPoly(event, "polyline", style);
break;
case "draw-polygon":
var style = "fill:crimson; ";
style += "stroke:crimson; ";
style += "stroke-width:1px; ";
style += "stroke-linecap:round; ";
style += "stroke-linejoin:round; ";
style += "fill-opacity:0.5; ";
this.drawPoly(event, "polygon", style);
break;
case "draw-rect":
this.drawRect(event);
break;
case "draw-circle":
this.drawCircle(event);
break;
case "draw-freehand":
this.drawFreehand(event);
break;
}
}
}
}
simpledrawObj.prototype.drawDot = function (event){
this.activeEl = document.createElementNS(this.svgns, "circle");
this.activeEl.setAttribute("cx", this.coords.x);
this.activeEl.setAttribute("cy", this.coords.y);
this.activeEl.setAttribute("r", "2");
this.activeEl.setAttribute("fill", "none");
this.activeEl.setAttribute("stroke", "blue");
this.activeEl.setAttribute("stroke-width", "3");
this.activeEl.setAttribute("stroke-linecap", "round");
this.activeEl.setAttribute("stroke-linejoin", "round");
// note that we're now appending draw elements to a specific canvas
this.canvas.appendChild( this.activeEl );
// if we don't set this to null, it starts dragging immediately!
this.activeEl = null;
}
simpledrawObj.prototype.drawPoly = function (event, shape, style){
if (!this.activeEl
|| shape != this.activeEl.localName ) {
this.activeEl = document.createElementNS(this.svgns, shape);
this.activeEl.setAttribute("style", style);
} else {
var points = this.activeEl.getAttribute("points");
this.points = points.split(" ");
}
if (!this.points) {
this.points = [];
}
this.points.push( this.coords.x + "," + this.coords.y );
this.activeEl.setAttribute("points", this.points.join(" "));
// no longer need to worry about SVG controls
this.canvas.appendChild( this.activeEl );
}
simpledrawObj.prototype.drawRect = function (event){
if (!this.activeEl ) {
this.activeEl = document.createElementNS(this.svgns, "rect");
var style = "fill:lime; ";
style += "stroke:lime; ";
style += "stroke-width:1px; ";
style += "fill-opacity:0.5; ";
this.activeEl.setAttribute("style", style);
if (!this.points) {
this.points = [];
}
// we're using the points array, but in a different way for rect than for polys
this.points.push( this.coords.x );
this.points.push( this.coords.y );
this.activeEl.setAttribute("x", this.points[0] );
this.activeEl.setAttribute("y", this.points[1] );
this.canvas.appendChild( this.activeEl );
}
}
simpledrawObj.prototype.drawCircle = function (event){
if (!this.activeEl ) {
this.activeEl = document.createElementNS(this.svgns, "circle");
var style = "fill:orange; ";
style += "stroke:orange; ";
style += "stroke-width:1px; ";
style += "fill-opacity:0.5; ";
this.activeEl.setAttribute("style", style);
if (!this.points) {
this.points = [];
}
// we're using the points array, but in a different way for rect than for polys
this.points.push( this.coords.x );
this.points.push( this.coords.y );
this.activeEl.setAttribute("cx", this.points[0] );
this.activeEl.setAttribute("cy", this.points[1] );
this.canvas.appendChild( this.activeEl );
}
}
simpledrawObj.prototype.drawFreehand = function (event){
if (!this.activeEl ) {
this.activeEl = document.createElementNS(this.svgns, "polyline");
var style = "fill:none; ";
style += "stroke:purple; ";
style += "stroke-width:2px; ";
style += "stroke-linecap:round; ";
style += "stroke-linejoin:round; ";
style += "pointer-events:stroke; ";
this.activeEl.setAttribute("style", style);
}
var points = this.activeEl.getAttribute("points");
if (!points) {
points = "";
}
points += this.coords.x + "," + this.coords.y + " ";
this.activeEl.setAttribute("points", points);
if ( this.canvas != event.target.parentNode ) {
this.canvas.appendChild( this.activeEl );
}
}
/*
// drag-n-drop
*/
simpledrawObj.prototype.grab = function (event){
if ( "drag" == this.mode || "erase" == this.mode ){
// stop native drag-n-drop
event.preventDefault();
event.stopPropagation();
// only grab things in drawing area
if ( this.canvas == event.target.parentNode ) {
var target = event.target;
if (this.backdrop != target) {
this.activeEl = target;
this.coords = localCoords(event, this.backdrop, this.root);
this.originpoint = this.coords;
// adjust for existing transforms
var transform = this.activeEl.getAttribute("transform");
if (transform) {
var translate = transform.replace("translate(", "").replace(")", "").split(",");
this.originpoint.x -= parseFloat( translate[0] );
this.originpoint.y -= parseFloat( translate[1] );
}
}
}
}
}
simpledrawObj.prototype.drag = function (event){
// stop native drag-n-drop
event.preventDefault();
event.stopPropagation();
this.coords = localCoords(event, this.backdrop, this.root);
if ( "drag" == this.mode ){
if ( this.activeEl ) {
var x = this.coords.x - this.originpoint.x;
var y = this.coords.y - this.originpoint.y;
this.activeEl.setAttribute("transform", "translate(" + x + "," + y + ")");
}
} else if (this.activeEl) {
switch (this.mode) {
case "draw-dot":
break;
case "draw-rect":
this.updateRect(event);
break;
case "draw-circle":
this.updateCircle(event);
break;
case "draw-polyline":
case "draw-polygon":
this.updatePoly(event);
break;
case "draw-freehand":
this.updateFreehand(event);
break;
}
}
}
simpledrawObj.prototype.drop = function (event){
if ( "drag" == this.mode ){
this.activeEl = null;
} else if ( "erase" == this.mode ) {
if ( this.activeEl ) {
this.activeEl.parentNode.removeChild( this.activeEl );
this.activeEl = null;
}
}
}
/*
// Update shapes
*/
simpledrawObj.prototype.updatePoly = function (event){
var points = this.points.join(" ");
points += " " + this.coords.x + "," + this.coords.y;
this.activeEl.setAttribute("points", points);
}
simpledrawObj.prototype.updateFreehand = function (event){
var points = this.activeEl.getAttribute("points");
if (!points) {
points = "";
}
points += this.coords.x + "," + this.coords.y + " ";
this.activeEl.setAttribute("points", points);
}
simpledrawObj.prototype.updateRect = function (event){
// we're using the points array, but in a different way for rect than for polys
this.points[2] = this.coords.x;
this.points[3] = this.coords.y;
var x = this.points[0];
var width = this.points[2] - this.points[0];
if ( 0 > width ) {
//if the current cursor x is to the left of the origin, we have to reposition the x attribute
x = this.points[2];
width = this.points[0] - this.points[2];
}
var y = this.points[1];
var height = this.points[3] - this.points[1];
if ( 0 > height ) {
//if the current cursor y is to the top of the origin, we have to reposition the y attribute
y = this.points[3];
height = this.points[1] - this.points[3];
}
this.activeEl.setAttribute("x", x );
this.activeEl.setAttribute("y", y );
this.activeEl.setAttribute("width", width );
this.activeEl.setAttribute("height", height );
}
simpledrawObj.prototype.updateCircle = function (event){
this.points[2] = this.coords.x;
this.points[3] = this.coords.y;
// geometry magic!
var radius = Math.sqrt(Math.pow(Math.abs(this.points[2] - this.points[0]), 2) + Math.pow(Math.abs(this.points[3] - this.points[1]), 2));
this.activeEl.setAttribute("r", radius );
}
/*
// UI controls
*/
simpledrawObj.prototype.handleButtons = function (event){
this.reset();
for (var b = 0, bLen = this.buttons.length; bLen > b; ++b) {
var eachButton = this.buttons[b];
eachButton.setAttribute("aria-pressed", "false" );
}
var target = event.target;
target.setAttribute("aria-pressed", "true" );
this.mode = target.getAttribute("data-mode");
console.log("mode: " + this.mode);
}
simpledrawObj.prototype.reset = function (event){
// clicking on any button should start a new active element and new mode
this.activeEl = null;
this.points = null;
}
// adjust coordinates for transforms
// note that this changed to add the SVG root element
function localCoords ( event, element, root ) {
var p = root.createSVGPoint();
p.x = event.clientX;
p.y = event.clientY;
return p.matrixTransform(element.getScreenCTM().inverse());
}
function bind (scope, fn) {
return function () {
return fn.apply( scope, arguments );
}
}
</script>
</head>
<body>
<main id="app">
<section id="controls">
<h1>SimpleDraw</h1>
<fieldset>
<legend>shapes</legend>
<button aria-pressed="true" data-mode="draw-dot">dot</button>
<button aria-pressed="false" data-mode="draw-polyline">polyline</button>
<button aria-pressed="false" data-mode="draw-polygon">polygon</button>
<button aria-pressed="false" data-mode="draw-rect">rectangle</button>
<button aria-pressed="false" data-mode="draw-circle">circle</button>
<button aria-pressed="false" data-mode="draw-freehand">freehand</button>
</fieldset>
<fieldset>
<legend>controls</legend>
<button aria-pressed="false" data-mode="drag">drag</button>
<button aria-pressed="false" data-mode="erase">erase</button>
</fieldset>
</section>
<section id="drawing-area">
<svg id="simpledraw"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
width="100%" height="100%" viewBox="0 0 600 600">
<title>SimpleDraw</title>
<defs>
<pattern id="grid10" x="0" y="0" width="10" height="10" patternUnits="userSpaceOnUse">
<rect x="0" y="0" width="10" height="10" style="stroke:gray;stroke-width:.1;fill:none;"/>
</pattern>
<pattern id="grid100" x="0" y="0" width="100" height="100" patternUnits="userSpaceOnUse">
<rect x="0" y="0" width="100" height="100" style="stroke:gray;stroke-width:0.2;fill:url(#grid10);"/>
</pattern>
</defs>
<rect id="backdrop" x="0" y="0" width="600" height="600"/>
<svg id="canvas" x="0" y="0" width="100%" height="100%"> </svg>
</svg>
</section>
</main>
<script>
</script>
</body>
</html>