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index.html
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<html><head>
<script src="caligrapher/math.js"></script>
<script src="caligrapher/vector.js"></script>
<script src="caligrapher/curveFitting.js"></script>
<script src="caligrapher/bezier.js"></script>
<script src="caligrapher/corners.js"></script>
<script src="caligrapher/character.js"></script>
<script src="caligrapher/strokeDrawing.js"></script>
<script src="./perfectFreehand/packages/perfect-freehand/src/compliedJs/getStroke.js"></script>
</head><body style="background: rgb(255, 239, 213);"><div id="canvas_wrapper" style="touch-action: none;">
<canvas id="secondary_canvas" width="2562" height="1309" style="height: 1309px;"></canvas>
<canvas id="main_canvas" width="2562" height="1309" style="height: 1309px;"></canvas>
</div>
<div id="pencil_button_bar">
<input type="button" class="active" onclick="active=!active;switch_visibility()" id="ts_visibility_button" value="Hide" title="Toggle visiblity">
<input type="button" class="active" onclick="switch_perfect_freehand()" id="ts_perfect_freehand_button" value="Perf" title="Perfect Freehand">
<input type="button" class="" onclick="switch_drawing_mode()" value="漢字" id="ts_kanji_button" title="Toggle calligrapher">
<input type="button" onclick="ts_undo();" value="Undo" title="Undo the last stroke" id="ts_undo_button" class="active">
<input type="button" class="active" onclick="clear_canvas();" value="Clean" title="Clean whiteboard">
</div>
<style>
body {
overflow-x: hidden; /* Hide horizontal scrollbar */
}
body::-webkit-scrollbar {
display: none;
}
#canvas_wrapper, #main_canvas, #secondary_canvas
{
position:absolute;
top: 0px;
left: 0px;
z-index: 999;
}
#main_canvas, #secondary_canvas{
opacity: """ + str(ts_opacity) + """;
pointer-events:auto;
}
.night_mode #pencil_button_bar input[type=button].active
{
color: #fff!important;
}
#pencil_button_bar input[type=button].active
{
color: black!important;
}
#pencil_button_bar
{
position: fixed;
bottom: 1px;
right: 1px;
z-index: 1000;
font-family: "Arial Unicode MS", unifont, "Everson Mono", tahoma, arial;
}
#pencil_button_bar input[type=button]
{
border: 1px solid black;
margin: 0 1px;
float: left;
width: 120px!important;
font-size: 40px;
line-height: 40px;
height: 80px;
border-radius: 8px;
background-color: rgba(250,250,250,0.5)!important;
color: black;
color: #ccc!important;
}
.night_mode #pencil_button_bar input[type=button]{
background-color: rgba(10,10,10,0.5)!important;
border-color: #ccc;
color: #444!important;
text-shadow: 0 0 1px rgba(5, 5, 5, 0.9);
}
#canvas_wrapper
{
height: 100px
}
</style>
<script>
var visible = true;
var calligraphy = false;
var perfectFreehand = true;
var canvas = document.getElementById('main_canvas');
var secondary_canvas = document.getElementById('secondary_canvas');
var wrapper = document.getElementById('canvas_wrapper');
var ts_undo_button = document.getElementById('ts_undo_button');
var ts_visibility_button = document.getElementById('ts_visibility_button');
var ts_kanji_button = document.getElementById('ts_kanji_button');
var ts_perfect_freehand_button = document.getElementById('ts_perfect_freehand_button');
var ctx = canvas.getContext('2d');
var secondary_ctx = secondary_canvas.getContext('2d');
var arrays_of_points = [ ];
var line_type_history = [ ];
var perfect_cache = [ ];
var color = 'grey';
var line_width = 4;
var card = true;
canvas.onselectstart = function() { return false; };
secondary_canvas.onselectstart = function() { return false; };
wrapper.onselectstart = function() { return false; };
function switch_visibility()
{
stop_drawing();
if (visible)
{
canvas.style.display='none';
secondary_canvas.style.display=canvas.style.display;
ts_visibility_button.className = '';
}
else
{
ts_visibility_button.className = 'active';
canvas.style.display='block';
secondary_canvas.style.display=canvas.style.display;
}
visible = !visible;
}
function switch_perfect_freehand()
{
stop_drawing();
perfectFreehand = !perfectFreehand;
if(perfectFreehand)
{
ts_perfect_freehand_button.className = 'active';
}
else{
ts_perfect_freehand_button.className = '';
}
ts_redraw()
}
//Initialize event listeners at the start;
canvas.addEventListener("pointerdown", pointerDownLine);
canvas.addEventListener("pointermove", pointerMoveLine);
window.addEventListener("pointerup", pointerUpLine);
canvas.addEventListener("pointerdown", pointerDownCaligraphy);
canvas.addEventListener("pointermove", pointerMoveCaligraphy);
window.addEventListener("pointerup", pointerUpCaligraphy);
function switch_drawing_mode()
{
stop_drawing();
calligraphy = !calligraphy;
if(calligraphy)
{
ts_kanji_button.className = 'active';
}
else{
ts_kanji_button.className = '';
}
}
function switch_class(e,c)
{
var reg = new RegExp('(\\\s|^)' + c + '(\\s|$)');
if (e.className.match(new RegExp('(\\s|^)' + c + '(\\s|$)')))
{
e.className = e.className.replace(reg, '');
}
else
{
e.className += c;
}
}
function resize() {
var card = document.getElementsByClassName('card')[0]
ctx.canvas.width = window.innerWidth-1;
ctx.canvas.height = Math.max(
document.body.clientHeight,
window.innerHeight,
card ? card.scrollHeight : 0
)-1;
secondary_ctx.canvas.width = ctx.canvas.width;
secondary_ctx.canvas.height = ctx.canvas.height;
/* Get DPR with 1 as fallback */
var dpr = window.devicePixelRatio || 1;
dpr = dpr > 1 ? dpr : 1;
/* CSS size is the same */
canvas.style.height = ctx.canvas.height + 'px';
wrapper.style.width = ctx.canvas.width + 'px';
secondary_canvas.style.height = canvas.style.height;
secondary_canvas.style.width = canvas.style.width;
/* Increase DOM size and scale */
ctx.canvas.width *= dpr;
ctx.canvas.height *= dpr;
ctx.scale(dpr, dpr);
secondary_ctx.canvas.width *= dpr;
secondary_ctx.canvas.height *= dpr;
secondary_ctx.scale(dpr, dpr);
update_pen_settings()
}
window.addEventListener('resize', resize);
window.addEventListener('load', resize);
window.requestAnimationFrame(draw_last_line_segment);
var isPointerDown = false;
var mouseX = 0;
var mouseY = 0;
var active = true;
function update_pen_settings(){
ctx.lineJoin = ctx.lineCap = 'round';
ctx.lineWidth = line_width;
ctx.strokeStyle = color;
ctx.fillStyle = color;
secondary_ctx.lineJoin = ctx.lineJoin;
secondary_ctx.lineWidth = ctx.lineWidth;
secondary_ctx.strokeStyle = ctx.strokeStyle;
ts_redraw()
}
function ts_undo(){
stop_drawing();
switch (line_type_history.pop()) {
case 'C'://Calligraphy
strokes.pop();
break;
case 'L'://Simple Lines
var index = arrays_of_points.length-1
arrays_of_points.pop()
perfect_cache[index] = null;
break;
default:
//console.log("Unrecognized line type for undo")
break;
}
if(!line_type_history.length)
{
ts_undo_button.className = ""
}
ts_redraw()
}
function ts_redraw() {
pleaseRedrawEverything = true;
}
function ts_clear() {
pleaseRedrawEverything = true;
fullClear = true;
}
function clear_canvas()
{
//don't continue to put points into an empty array(pointermove) if clearing while drawing on the canvas
stop_drawing();
arrays_of_points = [];
perfect_cache = [];
strokes = [];
line_type_history = [];
ts_clear();
}
function stop_drawing() {
isPointerDown = false;
drawingWithPressurePenOnly = false;
}
function start_drawing() {
ts_undo_button.className = "active"
isPointerDown = true;
}
function draw_last_line_segment() {
window.requestAnimationFrame(draw_last_line_segment);
draw_upto_latest_point_async(nextLine, nextPoint, nextStroke);
}
var nextLine = 0;
var nextPoint = 0;
var nextStroke = 0;
var p1,p2,p3;
async function draw_path_at_some_point_async(startX, startY, midX, midY, endX, endY, lineWidth) {
ctx.beginPath();
ctx.moveTo((startX + (midX - startX) / 2), (startY + (midY - startY)/ 2));//midpoint calculation for x and y
ctx.quadraticCurveTo(midX, midY, (midX + (endX - midX) / 2), (midY + (endY - midY)/ 2));
ctx.lineWidth = lineWidth;
ctx.stroke();
};
function is_last_path_and_currently_drawn(i){
return (isPointerDown && arrays_of_points.length-1 == i)//the path is complete unless its the last of the array and the pointer is still down
}
function all_drawing_finished(i){
return (!isPointerDown && arrays_of_points.length-1 == i)//the path is complete unless its the last of the array and the pointer is still down
}
var pleaseRedrawEverything = false;
var fullClear = false;
async function draw_upto_latest_point_async(startLine, startPoint, startStroke){
//Don't keep redrawing the same last point over and over
//if(!pleaseRedrawEverything &&
//(startLine == arrays_of_points.length && startPoint == arrays_of_points[startLine-1].length) &&
//(startStroke == strokes.length)) return;
var fullRedraw = false;//keep track if this call started a full redraw to unset pleaseRedrawEverything flag later.
if (pleaseRedrawEverything) {// erase everything and draw from start
fullRedraw = true;
startLine = 0;
startPoint = 0;
startStroke = 0;
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
}
for(var i = startLine; i < arrays_of_points.length; i++){ //Draw Lines
var needPerfectDraw = false;
nextLine = i;
///0,0,0; 0,0,1; 0,1,2 or x+1,x+2,x+3
//take the 2 previous points in addition to current one at the start of the loop.
p2 = arrays_of_points[i][startPoint > 1 ? startPoint-2 : 0];
p3 = arrays_of_points[i][startPoint > 0 ? startPoint-1 : 0];
for(var j = startPoint; j < arrays_of_points[i].length; j++){
nextPoint = j + 1;//track which point was last drawn so we can pick up where we left off on the next refresh.
p1 = p2;
p2 = p3;
p3 = arrays_of_points[i][j];
if(!perfectFreehand){
draw_path_at_some_point_async(p1[0],p1[1],p2[0],p2[1],p3[0],p3[1],p3[3]);
}
else {needPerfectDraw = true;}
}
if(needPerfectDraw) {
var path = !perfect_cache[i] || is_last_path_and_currently_drawn(i) ? new Path2D(
getFreeDrawSvgPath(
arrays_of_points[i],
!is_last_path_and_currently_drawn(i)
))
: perfect_cache[i]
perfect_cache[i] = path
ctx.fill(path);
}
if(all_drawing_finished(i)){
nextLine++;
nextPoint = 0;
}
startPoint = 0;
}
//Draw Calligraphy Strokes one by one starting from the given point
for(var i = startStroke; i < strokes.length; i++){
nextStroke = i+1;
strokes[i].draw(WEIGHT, ctx);
}
if (fullRedraw) {//finished full redraw, now can unset redraw all flag so no more full redraws until necesarry
pleaseRedrawEverything = false;
fullRedraw = false;
nextPoint = strokes.length == 0 ? 0 : nextPoint;//reset nest point if out of lines
nextStroke = strokes.length == 0 ? 0 : nextStroke;//reset for undo as well
if(fullClear){// start again from 0.
nextLine = 0;
nextStroke = 0;
fullClear = false;
}
}
}
var drawingWithPressurePenOnly = false; // hack for drawing with 2 main pointers when using a presure sensitive pen
function pointerDownLine(e) {
if (!e.isPrimary || calligraphy) { return; }
if (e.pointerType[0] == 'p') { drawingWithPressurePenOnly = true }
else if ( drawingWithPressurePenOnly) { return; }
if(!isPointerDown){
event.preventDefault();
arrays_of_points.push([[
e.offsetX,
e.offsetY,
e.pointerType[0] == 'p' ? e.pressure : 2,
e.pointerType[0] == 'p' ? (0.8 + e.pressure * line_width * 2) : line_width]]);
line_type_history.push('L');//Add new Simple line marker to shared history
start_drawing();
}
}
function pointerMoveLine(e) {
if (!e.isPrimary || calligraphy) { return; }
if (e.pointerType[0] != 'p' && drawingWithPressurePenOnly) { return; }
if (isPointerDown && active) {
arrays_of_points[arrays_of_points.length-1].push([
e.offsetX,
e.offsetY,
e.pointerType[0] == 'p' ? e.pressure : 2,
e.pointerType[0] == 'p' ? (0.8 + e.pressure * line_width * 2) : line_width]);
}
}
function pointerUpLine(e) {
/* Needed for the last bit of the drawing. */
if (!e.isPrimary || calligraphy) { return; }
if (e.pointerType[0] != 'p' && drawingWithPressurePenOnly) { return; }
if (isPointerDown && active) {
arrays_of_points[arrays_of_points.length-1].push([
e.offsetX,
e.offsetY,
e.pointerType[0] == 'p' ? e.pressure : 2,
e.pointerType[0] == 'p' ? (0.8 + e.pressure * line_width * 2) : line_width]);
}
stop_drawing();
if(perfectFreehand) ts_redraw();
}
document.addEventListener('keyup', function(e) {
// alt + Z or z
if ((e.keyCode == 90 || e.keyCode == 122) && e.altKey) {
e.preventDefault();
ts_undo();
}
// /
if (e.key === ".") {
clear_canvas();
}
// ,
if (e.key === ",") {
switch_visibility();
}
// alt + C or c
if ((e.key === "c" || e.key === "C") && e.altKey) {
e.preventDefault();
switch_drawing_mode();
}
// alt + X or x
if ((e.key === "x" || e.key === "X") && e.altKey) {
e.preventDefault();
switch_perfect_freehand();
}
})
/*
-------------------------------- Part of Caligrapher ------------------------------------------
Created By: August Toman-Yih
Git Repository: https://github.com/atomanyih/Calligrapher
*/
/* ------------------------------ script.js -----------------------------*/
//Modified to work with current canvas and board
//share the same canvas with pressure drawing
/*var canvas = document.getElementById('canvas'),
width = canvas.width,
height = canvas.height,
context = canvas.getContext("2d");
*/
//FIXME REORGANIZE EBERYTING
//--- constants ---//
RESOLUTION = 4;
WEIGHT = 15;
MIN_MOUSE_DIST = 5;
SPLIT_THRESHOLD = 8;
SQUARE_SIZE = 300;
//--- variables ---//
strokes = [];
points = [];
lines = [];
currentPath = [];
errPoint = [];
//use shared isPointerDown instead
//mouseDown = false;
// // share update function with pressure drawing so they don't clearRect eachother
// function update() {
// ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height);
// for(var i = 0; i<strokes.length; i++)
// strokes[i].draw(WEIGHT,ctx);
// }
function drawCurrentPath() {
secondary_ctx.beginPath();
secondary_ctx.moveTo(currentPath[0][0],currentPath[0][1]);
for(var i = 1; i<currentPath.length; i++) {
secondary_ctx.lineTo(currentPath[i][0],currentPath[i][1]);
}
secondary_ctx.stroke();
}
function pointerDownCaligraphy(e) {
if (!e.isPrimary || !calligraphy) { return; }
event.preventDefault();//don't paint anything when clicking on buttons, especially for undo to work
line_type_history.push('C');//Add new Caligragraphy line marker to shared history
start_drawing();
};
function pointerMoveCaligraphy(e) {
if (!e.isPrimary || !calligraphy) { return; }
if(isPointerDown) {
var mousePos = [e.offsetX, e.offsetY];
if(currentPath.length != 0) {
if(getDist(mousePos,currentPath[currentPath.length-1])>=MIN_MOUSE_DIST)
currentPath.push(mousePos);
drawCurrentPath();
} else
currentPath.push(mousePos);
}
};
function pointerUpCaligraphy(e) {
stop_drawing();
if (!e.isPrimary || !calligraphy || !currentPath.length) { return; }
points = currentPath;
var curves = fitStroke(points);
strokes.push(new Stroke(curves));
currentPath = [];// clear the array on pointer up so it doesnt enter new lines when clicking on buttons
secondary_ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);//clear the guide line in second canvas
};
// // handled in ts_undo()
// keydown = function(event) {
// var k = event.keyCode;
// console.log(k);
// if(k==68) {
// strokes.pop();
// }
// update();
// };
//
//window.addEventListener("keydown",keydown,true);
//
//update();
// ----------------------------------------- Perfect Freehand -----------------------------------------
function med(A, B) {
return [(A[0] + B[0]) / 2, (A[1] + B[1]) / 2];
}
// Trim SVG path data so number are each two decimal points. This
// improves SVG exports, and prevents rendering errors on points
// with long decimals.
const TO_FIXED_PRECISION = /(\s?[A-Z]?,?-?[0-9]*\.[0-9]{0,2})(([0-9]|e|-)*)/g;
function getSvgPathFromStroke(points){
if (!points.length) {
return "";
}
const max = points.length - 1;
return points
.reduce(
(acc, point, i, arr) => {
if (i === max) {
acc.push(point, med(point, arr[0]), "L", arr[0], "Z");
} else {
acc.push(point, med(point, arr[i + 1]));
}
return acc;
},
["M", points[0], "Q"],
)
.join(" ")
.replace(TO_FIXED_PRECISION, "$1");
}
function getFreeDrawSvgPath(inputPoints, complete) {
// Consider changing the options for simulated pressure vs real pressure
const options = {
simulatePressure: inputPoints[0][2] > 1,
size: line_width,
thinning: 0.6,
smoothing: 0.5,
streamline: 0.5,
easing: (t) => Math.sin((t * Math.PI) / 2), // https://easings.net/#easeOutSine
last: complete, // LastCommittedPoint is added on pointerup
};
return getSvgPathFromStroke(getStroke(inputPoints, options));
}
</script></body></html>