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shapes11.html
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shapes11.html
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<!DOCTYPE html>
<html>
<head>
<title>Drawing Shapes</title>
<link rel="stylesheet" type="text/css" href="mystylesheet.css"/>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.2.js"></script>
<script type="text/javascript" src="http://meta100.github.com/mColorPicker/javascripts/mColorPicker_min.js"></script>
<script type="text/javascript">
$.fn.mColorPicker.init.replace = false;//initialise color picker with no color
$(document).ready(function(){
//reading client window height and width
height=$(window).height()-50;
width=$(window).width()-120;
//initialise the canvas
init();
//to select a tool from the toolbar
$(".tools").click(function(){
$(".selected").removeClass("selected");
$(this).addClass("selected");
selectedTool=this.id;
context.lineWidth=1;
context.strokeStyle=linecol;
if(selectedTool!="cursor")
{
if(document.getElementById('board').childNodes.length==1)
{
if((selectedTool=="rect")||(selectedTool=="circle")||(selectedTool=="line"))
{
document.getElementById('cnvs').style.cursor="crosshair";
}
else
{
document.getElementById('cnvs').style.cursor="default";
}
addTempCanvas();
}
if(selectedTool=="clearall")
{
clearCanvas();
}
}
else
{
$('#tempImg').remove();
}
});
//to select background,line and foreground color
/*
$('#bgcolor').mColorPicker();
$('#bgcolor').bind('colorpicked', function(){
bgcol=($(this).val());
$('#board').css("background-color",bgcol);
});
$('#fgcolor').mColorPicker();
$('#fgcolor').bind('colorpicked', function(){
fgcol=($(this).val());
context.fillStyle=fgcol;
});
*/
$('#linecolor').mColorPicker();
$('#linecolor').bind('colorpicked', function(){
linecol=($(this).val());
context.strokeStyle=linecol;
});
});
</script>
</head>
<body>
<div id="container">
<div id="cnvs">
<canvas id="board">
This text is displayed if your browser does not support HTML5 Canvas.
</canvas>
</div>
<div id="toolbar">
Toolbar
<div id="pencil" class="tools"> </div>
<div id="rect" class="tools"> </div>
<div id="line" class="tools"> </div>
<div id="circle" class="tools"> </div>
<div id="brush" class="tools"> </div>
<div id="cursor" class="tools"> </div>
<div id="eraser" class="tools"> </div>
<div id="clearall" class="tools"> </div>
</div>
</div>
<div id="palette">
<!-- <input id="bgcolor" type="color" placeholder="Background color"/> -->
<input id="linecolor" type="color" placeholder="Line color"/>
<!-- <input id="fgcolor" type="color" placeholder="Foreground color"/> -->
</div>
</body>
<script type="text/javascript">
//variables for original and temporary canvas
var canvas,context;
var canvaso,contexto;
//starting coordinates
var startX=0;
var startY=0;
//ending coordinates
var endX=0;
var endY=0;
var diffX=0;
var diffY=0;
//height and width of canvas
var height=0;
var width=0;
var selectedTool;
//to store the status of mouse button up or down
var started;
//x and y will have the values of the coordinates of the mouse
var x,y;
//variables to store the selected color
var bgcol="white";
var linecol="black";
//var fgcol; //not used
//to create parent node for the canvas
var container;
var parent=document.getElementById('board');
// drag and drop globals
var offsetX = 0;
var offsetY = 0;
function init()
{
canvaso = document.getElementById('board');
contexto = canvaso.getContext('2d');
canvaso.height = height;
canvaso.width = width;
addTempCanvas();
started=false;
}
//creating a temporary canvas from which images will be copied onto the original canvas
function addTempCanvas()
{
container = canvaso.parentNode;
canvas = document.createElement('canvas');
canvas.id = 'tempImg';
canvas.width = width;
canvas.height = height;
container.appendChild(canvas);
context = canvas.getContext('2d');
//adding event listeners
canvas.addEventListener('mousedown',mouseDown,false);
canvas.addEventListener('mouseup',mouseUp,false);
canvas.addEventListener('mousemove',mouseMove,false);
canvas.addEventListener('mouseout',mouseOut,false);
canvaso.addEventListener('mouseup', canvMouse, false);
}
function canvMouse(event)
{
if (selectedTool == "cursor")
{
startX=event.screenX;
startY=event.screenY;
}
}
//if the mouse is clicked and dragged out of the canvas, nothing should be drawn
function mouseOut(event)
{
started=false;
}
//this defines what should be done when the mouse is moved
function mouseMove(event)
{
context.strokeStyle=linecol;
if (event.clientX || event.clientY == 0)
{
x=event.clientX;
y=event.clientY;
if(selectedTool=="pencil"||selectedTool=="brush"||selectedTool=="eraser")
{
if(selectedTool!="pencil")
{
context.lineWidth=5;
}
if(selectedTool=="eraser")
{
context.strokeStyle=bgcol;
}
if (started)
{
context.lineTo(x, y);
context.stroke();
}
else
{
context.beginPath();
context.moveTo(x, y);
}
}
else if(selectedTool=="clearall")
{
}
/*else if(selectedTool=="cursor")
{
}*/
else
{
if(started)
{
context.clearRect(0, 0,width,height);
drawShape(selectedTool,startX,startY,x,y);
}
}
}
}
/*only when the mouse button is pressed down, should anything be drawn.so before drawing an image,the value of started is checked and is drawn only if the value is true*/
function mouseDown(event)
{
startX=event.clientX;
startY=event.clientY;
started=true;
}
//only after the mouse button is left i.e., mouseup,the object is actually drawn onto the canvas depending on the tool
function mouseUp(event)
{
endX=event.clientX;
endY=event.clientY;
started=false;
drawShape(selectedTool,startX,startY,endX,endY);
img_update();
}
//after every mouse up,the image drawn on the temporary canvas is redrawn onto the original canvas
function img_update()
{
contexto.beginPath();
contexto.drawImage(canvas, 0, 0);
contexto.closePath();
context.clearRect(0, 0, canvas.width, canvas.height);
}
function drawShape(tool,cornerX,cornerY,corner2X,corner2Y)
{
switch(tool)
{
//to draw a line
case "line":
{
context.beginPath();
context.moveTo(cornerX,cornerY);
context.lineTo(corner2X,corner2Y);
context.stroke();
context.closePath();
}
break;
//to draw a rectangle
case "rect":
{
diffX=-corner2X+cornerX;
diffY=-corner2Y+cornerY;
context.strokeRect(cornerX,cornerY,-diffX,-diffY);
}
break;
//to draw a circle
case "circle":
{
x=(cornerX+corner2X)/2;
y=(cornerY+corner2Y)/2;
diffX=(cornerX-corner2X)*(cornerX-corner2X);
diffY=(cornerY-corner2Y)*(cornerY-corner2Y);
var radius=Math.sqrt(diffX+diffY)/2;
context.beginPath();
context.arc(x,y,radius,0,2*Math.PI,false);
context.stroke();
}
break;
}
}
//to clear canvas
function clearCanvas()
{
contexto.clearRect(0,0,width,height);
}
</script>
</html>