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browpad.js
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browpad.js
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$(document).ready(function(){
var sketch = document.querySelector('#sketch');
var canvas = document.querySelector('#canvas');
var tmp_canvas = document.createElement('canvas');
//$('#paint-modal').css('visibility', 'hidden').show();
canvas.width = $(sketch).width();
canvas.height = $(sketch).height();
//$('#paint-modal').css('visibility', 'visible').hide();
tmp_canvas.width = canvas.width;
tmp_canvas.height = canvas.height;
var undo_canvas = [];
var undo_canvas_len = 7;
for (var i=0; i<undo_canvas_len; ++i) {
var ucan = document.createElement('canvas');
ucan.width = canvas.width;
ucan.height = canvas.height;
var uctx = ucan.getContext('2d');
undo_canvas.push({'ucan':ucan, 'uctx':uctx, 'redoable':false});
}
var undo_canvas_top = 0;
var ctx = canvas.getContext('2d');
var tmp_ctx = tmp_canvas.getContext('2d');
tmp_canvas.id = 'tmp_canvas';
sketch.appendChild(tmp_canvas);
var mouse = {x: 0, y: 0};
var start_mouse = {x:0, y:0};
var eraser_width = 10; // deault eraser width
var fontSize = '14px'; // default font size
// Pencil Points
var ppts = [];
var something_selected = 0; // If tool is crop but there is no mouse move
function hide_selection() {
//console.log('hide selection');
croparea.style.display = 'none';
$('#crop-cancel-button').css('display', 'none');
something_selected = 0;
}
var chosen_size = 2; // by default
/* Drawing on Paint App */
tmp_ctx.lineWidth = 3; // default
tmp_ctx.lineJoin = 'round';
tmp_ctx.lineCap = 'round';
tmp_ctx.strokeStyle = 'black'; // default color
tmp_ctx.fillStyle = 'black';
// paint functions
var paint_pencil = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
//console.log(mouse.x + " "+mouse.y);
// Saving all the points in an array
ppts.push({x: mouse.x, y: mouse.y});
if (ppts.length < 3) {
var b = ppts[0];
tmp_ctx.beginPath();
//ctx.moveTo(b.x, b.y);
//ctx.lineTo(b.x+50, b.y+50);
tmp_ctx.arc(b.x, b.y, tmp_ctx.lineWidth / 2, 0, Math.PI * 2, !0);
tmp_ctx.fill();
tmp_ctx.closePath();
return;
}
// Tmp canvas is always cleared up before drawing.
// This clearing is happening continuously, every time the mouse changes its position while drawing
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
tmp_ctx.beginPath();
tmp_ctx.moveTo(ppts[0].x, ppts[0].y);
for (var i = 0; i < ppts.length; i++)
tmp_ctx.lineTo(ppts[i].x, ppts[i].y);
tmp_ctx.stroke();
};
var paint_line = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
tmp_ctx.beginPath();
tmp_ctx.moveTo(start_mouse.x, start_mouse.y);
tmp_ctx.lineTo(mouse.x, mouse.y);
tmp_ctx.stroke();
tmp_ctx.closePath();
}
var paint_square = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
tmp_ctx.beginPath();
tmp_ctx.moveTo(start_mouse.x, start_mouse.y);
var x = Math.min(mouse.x, start_mouse.x);
var y = Math.min(mouse.y, start_mouse.y);
var width = Math.abs(mouse.x - start_mouse.x);
var height = Math.abs(mouse.y - start_mouse.y);
tmp_ctx.strokeRect(x, y, width, height);
tmp_ctx.closePath();
}
var paint_circle = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
var x = (mouse.x + start_mouse.x) / 2;
var y = (mouse.y + start_mouse.y) / 2;
//var radius = Math.max(Math.abs(mouse.x - start_mouse.x), Math.abs(mouse.y - start_mouse.y)) / 2;
var a = mouse.x - start_mouse.x;
var b = mouse.y - start_mouse.y;
var r = Math.sqrt(a*a + b*b);
tmp_ctx.beginPath();
//tmp_ctx.arc(x, y, radius, 0, Math.PI*2, false);
tmp_ctx.arc(start_mouse.x, start_mouse.y, r, 0, 2*Math.PI);
// tmp_ctx.arc(x, y, 5, 0, Math.PI*2, false);
tmp_ctx.stroke();
tmp_ctx.closePath();
}
var paint_ellipse = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
var x = start_mouse.x;
var y = start_mouse.y;
var w = (mouse.x - x);
var h = (mouse.y - y);
tmp_ctx.save(); // save state
tmp_ctx.beginPath();
tmp_ctx.translate(x, y);
tmp_ctx.scale(w/2, h/2);
tmp_ctx.arc(1, 1, 1, 0, 2 * Math.PI, false);
tmp_ctx.restore(); // restore to original state
tmp_ctx.stroke();
tmp_ctx.closePath();
}
var move_eraser = function(e){
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
var tmp_lw = tmp_ctx.lineWidth;
var tmp_ss = tmp_ctx.strokeStyle;
tmp_ctx.lineWidth = 1;
tmp_ctx.strokeStyle = 'black';
tmp_ctx.beginPath();
tmp_ctx.strokeRect(mouse.x, mouse.y, eraser_width, eraser_width);
tmp_ctx.stroke();
tmp_ctx.closePath();
// restore linewidth
tmp_ctx.lineWidth = tmp_lw; // previous tool could be pencil or circle or whatever
tmp_ctx.strokeStyle = tmp_ss; // recollect the previous color and font size
}
var paint_text = function(e) {
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
var x = Math.min(mouse.x, start_mouse.x);
var y = Math.min(mouse.y, start_mouse.y);
var width = Math.abs(mouse.x - start_mouse.x);
var height = Math.abs(mouse.y - start_mouse.y);
textarea.style.left = x + 'px';
textarea.style.top = y + 'px';
textarea.style.width = width + 'px';
textarea.style.height = height + 'px';
textarea.style.display = 'block'; // change from none to block to make it visible
}
var paint_crop = function (e) {
// Tmp canvas is always cleared up before drawing.
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
var x = Math.min(mouse.x, start_mouse.x);
var y = Math.min(mouse.y, start_mouse.y);
var width = Math.abs(mouse.x - start_mouse.x);
var height = Math.abs(mouse.y - start_mouse.y);
croparea.style.left = x + 'px';
croparea.style.top = y + 'px';
croparea.style.width = width + 'px';
croparea.style.height = height + 'px';
croparea.style.display = 'block'; // change from none to block to make it visible
something_selected = 1;
}
var paint_eraser = function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
// erase from the main ctx
ctx.clearRect(mouse.x, mouse.y, eraser_width, eraser_width);
// tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
}
// Choose tool
tool = 'pencil';
tools_func = {'pencil':paint_pencil, 'line':paint_line, 'square':paint_square,
'circle':paint_circle, 'ellipse':paint_ellipse, 'eraser':paint_eraser,
'text':paint_text, 'crop':paint_crop};
$('#tool-panel').on('click', function(event){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
// remove the mouse down eventlistener if any
tmp_canvas.removeEventListener('mousemove', tools_func[tool], false);
var target = event.target,
tagName = target.tagName.toLowerCase();
if(target && tagName != 'button'){
target = target.parentNode;
tagName = target.tagName.toLowerCase();
}
if(target && tagName === 'button'){
tool = $(target).data('divbtn');
if (tool === 'eraser') {
tmp_canvas.addEventListener('mousemove', move_eraser, false);
$(tmp_canvas).css('cursor', 'none');
}
else {
tmp_canvas.removeEventListener('mousemove', move_eraser, false);
$(tmp_canvas).css('cursor', 'crosshair');
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
}
}
});
// Change color
$('#color-panel').on('click', function(event){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
// remove the mouse down eventlistener if any
tmp_canvas.removeEventListener('mousemove', tools_func[tool], false);
var target = event.target,
tagName = target.tagName.toLowerCase();
if(target && tagName != 'button'){
target = target.parentNode;
tagName = target.tagName.toLowerCase();
}
if(target && tagName === 'button'){
tmp_ctx.strokeStyle = $(target).data('color');
tmp_ctx.fillStyle = $(target).data('color');
}
});
// Mouse-Down
tmp_canvas.addEventListener('mousedown', function(e) {
mouse.x = typeof e.offsetX !== 'undefined' ? e.offsetX : e.layerX;
mouse.y = typeof e.offsetY !== 'undefined' ? e.offsetY : e.layerY;
start_mouse.x = mouse.x;
start_mouse.y = mouse.y;
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
if (tool === 'pencil') {
tmp_canvas.addEventListener('mousemove', paint_pencil, false);
ppts.push({x: mouse.x, y: mouse.y});
paint_pencil(e);
}
if (tool === 'line') {
tmp_canvas.addEventListener('mousemove', paint_line, false);
}
if (tool === 'square') {
tmp_canvas.addEventListener('mousemove', paint_square, false);
}
if (tool === 'circle') {
tmp_canvas.addEventListener('mousemove', paint_circle, false);
// Mark the center
tmp_ctx.beginPath();
//ctx.moveTo(b.x, b.y);
//ctx.lineTo(b.x+50, b.y+50);
tmp_ctx.arc(start_mouse.x, start_mouse.y, tmp_ctx.lineWidth / 2, 0, Math.PI * 2, !0);
tmp_ctx.fill();
tmp_ctx.closePath();
// copy to real canvas
ctx.drawImage(tmp_canvas, 0, 0);
}
if (tool === 'ellipse') {
tmp_canvas.addEventListener('mousemove', paint_ellipse, false);
}
if (tool === 'text') {
tmp_canvas.addEventListener('mousemove', paint_text, false);
textarea.style.display = 'none'; // important to hide when clicked outside
}
if (tool === 'eraser') {
ctx.clearRect(mouse.x, mouse.y, eraser_width, eraser_width); // for single click erase
tmp_canvas.addEventListener('mousemove', paint_eraser, false); // for mousedown erase
// erase from the main ctx
}
if (tool === 'crop') {
tmp_canvas.addEventListener('mousemove', paint_crop, false);
//console.log('addEventListener paint_crop');
}
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
}, false);
// crop-tool
var croparea = document.createElement('textarea');
croparea.id = 'crop_area';
croparea.setAttribute('readonly', 'readonly');
sketch.appendChild(croparea);
// text-tool
var textarea = document.createElement('textarea');
textarea.id = 'text_tool';
sketch.appendChild(textarea);
textarea.addEventListener('mouseup', function(e) {
tmp_canvas.removeEventListener('mousemove', paint_text, false);
}, false);
// set the color
textarea.addEventListener('mousedown', function(e){
textarea.style.color = tmp_ctx.strokeStyle;
textarea.style['font-size'] = fontSize;
}, false);
textarea.addEventListener('blur', function(e) {
var lines = textarea.value.split('\n');
var ta_comp_style = getComputedStyle(textarea);
var fs = ta_comp_style.getPropertyValue('font-size');
var ff = ta_comp_style.getPropertyValue('font-family');
tmp_ctx.font = fs + ' ' + ff;
tmp_ctx.textBaseline = 'hanging';
for (var n = 0; n < lines.length; n++) {
var line = lines[n];
tmp_ctx.fillText(
line,
parseInt(textarea.style.left),
parseInt(textarea.style.top) + n*parseInt(fs)
);
}
// Writing down to real canvas now
ctx.drawImage(tmp_canvas, 0, 0);
textarea.style.display = 'none';
textarea.value = '';
// Clearing tmp canvas
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
// keep the image in the undo_canvas
undo_canvas_top = next_undo_canvas(undo_canvas_top);
var uctx = undo_canvas[undo_canvas_top]['uctx'];
uctx.clearRect(0, 0, canvas.width, canvas.height);
uctx.drawImage(canvas, 0, 0);
undo_canvas[undo_canvas_top]['redoable'] = false;
});
// When resized by dragging the bottom-right dashed lines in the text area, the size of selection changes
croparea.addEventListener('mouseup', function(e) {
//console.log('removeEventListener paint_crop');
tmp_canvas.removeEventListener('mousemove', paint_crop, false);
}, false);
croparea.addEventListener('blur', function(e) {
//console.log('blur');
hide_selection();
}, false);
tmp_canvas.addEventListener('mouseup', function() {
// console.log('mouse up');
tmp_canvas.removeEventListener('mousemove', tools_func[tool], false);
// Writing down to real canvas now
// text-tool is managed when textarea.blur() event
if (tool !=='text' && tool !== 'crop') {
if (tool != 'eraser')
ctx.drawImage(tmp_canvas, 0, 0); // don't write in the case of eraser, coz we delete directly from the ctx
// keep the image in the undo_canvas
undo_canvas_top = next_undo_canvas(undo_canvas_top);
var uctx = undo_canvas[undo_canvas_top]['uctx'];
uctx.clearRect(0, 0, canvas.width, canvas.height);
uctx.drawImage(canvas, 0, 0);
undo_canvas[undo_canvas_top]['redoable'] = false;
}
if (tool === 'crop') {
//console.log('removeEventListener paint_crop');
// show crop-cancel-button only if there was a movemove previously, not a single mouse click
if (something_selected)
$('#crop-cancel-button').css('display','block');
}
// Clearing tmp canvas
tmp_ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
// Emptying up Pencil Points
ppts = [];
}, false);
var next_undo_canvas = function(top) {
if (top === undo_canvas_len-1)
return 0;
else
return top+1;
}
var prev_undo_canvas = function(top) {
if (top === 0)
return undo_canvas_len-1;
else
return top-1;
}
// clear paint area
$('#paint-clear').click(function(){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
ctx.clearRect(0, 0, tmp_canvas.width, tmp_canvas.height);
// keep the image in the undo_canvas
undo_canvas_top = next_undo_canvas(undo_canvas_top);
var uctx = undo_canvas[undo_canvas_top]['uctx'];
uctx.clearRect(0, 0, canvas.width, canvas.height);
uctx.drawImage(canvas, 0, 0);
undo_canvas[undo_canvas_top]['redoable'] = false;
});
// Change Size
$('#choose-size .radio-group').on('click', function(){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
var s = $('input[name=size]:checked', '#choose-size').val();
if (s==='1') {
tmp_ctx.lineWidth = 1;
eraser_width = 5;
fontSize = '10px';
}
if (s==='2') {
tmp_ctx.lineWidth = 3;
eraser_width = 10;
fontSize = '14px';
}
if (s==='3') {
tmp_ctx.lineWidth = 6;
eraser_width = 15;
fontSize = '18px';
}
if (s==='4') {
tmp_ctx.lineWidth = 10;
eraser_width = 20;
fontSize = '22px';
}
});
// undo-redo tools
$('#undo-tool').on('click', function(){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
var prev = prev_undo_canvas(undo_canvas_top);
if (!undo_canvas[prev].redoable) {
console.log(undo_canvas_top+' prev='+prev);
var ucan = undo_canvas[prev]['ucan'];
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(ucan, 0, 0);
undo_canvas[undo_canvas_top].redoable = true;
undo_canvas_top = prev;
}
});
$('#redo-tool').on('click', function(){
// very important to hide the croparea. Othewise clicking outside won't hide it.
hide_selection();
var next = next_undo_canvas(undo_canvas_top);
if (undo_canvas[next].redoable) {
console.log(undo_canvas_top);
var ucan = undo_canvas[next]['ucan'];
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(ucan, 0, 0);
undo_canvas[next].redoable = false;
undo_canvas_top = next;
}
});
$('#cancel-button').on('click', function() {
hide_selection();
});
var crop_canvas = document.createElement('canvas');
crop_canvas.id = 'crop_canvas';
sketch.appendChild(crop_canvas);
var c_ctx = crop_canvas.getContext('2d');
// Also called copy button
$('#crop-button').on('click', function() {
// Reset the Canvas!
var w = parseInt(croparea.style.width, 10); // selection width
var h = parseInt(croparea.style.height, 10); // selection height
var t = parseInt(croparea.style.top, 10);
var l = parseInt(croparea.style.left, 10);
crop_canvas.width = w;
crop_canvas.height = h;
c_ctx.drawImage(canvas, l, t, w, h, 0, 0, w, h);
// Remove the selection text area
hide_selection();
// Copy selected image to the clipboard
var dataURL = crop_canvas.toDataURL();
// window.open(dataURL, '_blank');
// To Copy to the clipboard
// Create a textarea and set its contents to the text you want copied to the clipboard.
// Append the textarea to the DOM.
// Select the text in the textarea.
// Call document.execCommand("copy")
// Remove the textarea from the dom.
var clipboard_textarea = document.createElement('textarea');
clipboard_textarea.id = 'cliparea';
sketch.appendChild(clipboard_textarea);
$('#cliparea').val(dataURL);
document.getElementById("cliparea").select();
document.execCommand('copy');
sketch.removeChild(clipboard_textarea);
// Show the alert that content has been copied!
$('#alert-bottom').addClass('in');
// Remove the alert after 1.8s
setTimeout(function(){
$('#alert-bottom').removeClass('in');
}, 1800);
});
});