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마우스를 사용하여 HTML5 Canvas에 그리기

lottoking 2020. 9. 6. 10:18
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마우스를 사용하여 HTML5 Canvas에 그리기

마우스를 사용하여 HTML Canvas에 그리고 싶습니다 (예 : 서명 그리기, 이름 그리기, ...)

어떻게 할 수 있습니까? 소스 코드를주세요. 감사합니다

다음은 작동하는 샘플입니다.

 <html>
    <script type="text/javascript">
    var canvas, ctx, flag = false,
        prevX = 0,
        currX = 0,
        prevY = 0,
        currY = 0,
        dot_flag = false;

    var x = "black",
        y = 2;
    
    function init() {
        canvas = document.getElementById('can');
        ctx = canvas.getContext("2d");
        w = canvas.width;
        h = canvas.height;
    
        canvas.addEventListener("mousemove", function (e) {
            findxy('move', e)
        }, false);
        canvas.addEventListener("mousedown", function (e) {
            findxy('down', e)
        }, false);
        canvas.addEventListener("mouseup", function (e) {
            findxy('up', e)
        }, false);
        canvas.addEventListener("mouseout", function (e) {
            findxy('out', e)
        }, false);
    }
    
    function color(obj) {
        switch (obj.id) {
            case "green":
                x = "green";
                break;
            case "blue":
                x = "blue";
                break;
            case "red":
                x = "red";
                break;
            case "yellow":
                x = "yellow";
                break;
            case "orange":
                x = "orange";
                break;
            case "black":
                x = "black";
                break;
            case "white":
                x = "white";
                break;
        }
        if (x == "white") y = 14;
        else y = 2;
    
    }
    
    function draw() {
        ctx.beginPath();
        ctx.moveTo(prevX, prevY);
        ctx.lineTo(currX, currY);
        ctx.strokeStyle = x;
        ctx.lineWidth = y;
        ctx.stroke();
        ctx.closePath();
    }
    
    function erase() {
        var m = confirm("Want to clear");
        if (m) {
            ctx.clearRect(0, 0, w, h);
            document.getElementById("canvasimg").style.display = "none";
        }
    }
    
    function save() {
        document.getElementById("canvasimg").style.border = "2px solid";
        var dataURL = canvas.toDataURL();
        document.getElementById("canvasimg").src = dataURL;
        document.getElementById("canvasimg").style.display = "inline";
    }
    
    function findxy(res, e) {
        if (res == 'down') {
            prevX = currX;
            prevY = currY;
            currX = e.clientX - canvas.offsetLeft;
            currY = e.clientY - canvas.offsetTop;
    
            flag = true;
            dot_flag = true;
            if (dot_flag) {
                ctx.beginPath();
                ctx.fillStyle = x;
                ctx.fillRect(currX, currY, 2, 2);
                ctx.closePath();
                dot_flag = false;
            }
        }
        if (res == 'up' || res == "out") {
            flag = false;
        }
        if (res == 'move') {
            if (flag) {
                prevX = currX;
                prevY = currY;
                currX = e.clientX - canvas.offsetLeft;
                currY = e.clientY - canvas.offsetTop;
                draw();
            }
        }
    }
    </script>
    <body onload="init()">
        <canvas id="can" width="400" height="400" style="position:absolute;top:10%;left:10%;border:2px solid;"></canvas>
        <div style="position:absolute;top:12%;left:43%;">Choose Color</div>
        <div style="position:absolute;top:15%;left:45%;width:10px;height:10px;background:green;" id="green" onclick="color(this)"></div>
        <div style="position:absolute;top:15%;left:46%;width:10px;height:10px;background:blue;" id="blue" onclick="color(this)"></div>
        <div style="position:absolute;top:15%;left:47%;width:10px;height:10px;background:red;" id="red" onclick="color(this)"></div>
        <div style="position:absolute;top:17%;left:45%;width:10px;height:10px;background:yellow;" id="yellow" onclick="color(this)"></div>
        <div style="position:absolute;top:17%;left:46%;width:10px;height:10px;background:orange;" id="orange" onclick="color(this)"></div>
        <div style="position:absolute;top:17%;left:47%;width:10px;height:10px;background:black;" id="black" onclick="color(this)"></div>
        <div style="position:absolute;top:20%;left:43%;">Eraser</div>
        <div style="position:absolute;top:22%;left:45%;width:15px;height:15px;background:white;border:2px solid;" id="white" onclick="color(this)"></div>
        <img id="canvasimg" style="position:absolute;top:10%;left:52%;" style="display:none;">
        <input type="button" value="save" id="btn" size="30" onclick="save()" style="position:absolute;top:55%;left:10%;">
        <input type="button" value="clear" id="clr" size="23" onclick="erase()" style="position:absolute;top:55%;left:15%;">
    </body>
    </html>

캔버스를 사용하여 그리기 응용 프로그램을 만드는 가장 간단한 방법은 다음과 가능합니다.

  1. 부착 mousedown, mousemove및 mouseup캔버스 DOM에 이벤트 리스너를
  2. 에서 mousedown마우스 좌표를 배치 메소드 moveTo()를 사용 하여하여 드로잉 커서를 하고 메소드 를 사용하여 beginPath()새 드로잉 경로를 시작합니다.
  3. 에서 mousemove를 사용하여 경로에 새 점을 계속 추가 lineTo()하고 사용하여 마지막 세그먼트에 색상을 지정합니다 stroke().
  4. 에서 mouseup제도를 설정하는 플래그를 설정합니다.

여기에서 사용자에게 선 프로그램, 색상, 기능을 추가 할 수있는 등 종류의 다른 기능을 추가 할 수 있습니다.

구글링 ( "html5 canvas paint program"). 필요한 것입니다.

http://dev.opera.com/articles/view/html5-canvas-painting/

여기에있는 다른 예는 너무 복잡하다고 생각합니다. 이것은 더 간단하고 JS 만 ...

// create canvas element and append it to document body
var canvas = document.createElement('canvas');
document.body.appendChild(canvas);

// some hotfixes... ( ≖_≖)
document.body.style.margin = 0;
canvas.style.position = 'fixed';

// get canvas 2D context and set him correct size
var ctx = canvas.getContext('2d');
resize();

// last known position
var pos = { x: 0, y: 0 };

window.addEventListener('resize', resize);
document.addEventListener('mousemove', draw);
document.addEventListener('mousedown', setPosition);
document.addEventListener('mouseenter', setPosition);

// new position from mouse event
function setPosition(e) {
  pos.x = e.clientX;
  pos.y = e.clientY;
}

// resize canvas
function resize() {
  ctx.canvas.width = window.innerWidth;
  ctx.canvas.height = window.innerHeight;
}

function draw(e) {
  // mouse left button must be pressed
  if (e.buttons !== 1) return;

  ctx.beginPath(); // begin

  ctx.lineWidth = 5;
  ctx.lineCap = 'round';
  ctx.strokeStyle = '#c0392b';

  ctx.moveTo(pos.x, pos.y); // from
  setPosition(e);
  ctx.lineTo(pos.x, pos.y); // to

  ctx.stroke(); // draw it!
}

http://jsfiddle.net/ArtBIT/kneDX/ 확인하십시오 . 올바른 방향으로 안내해야합니다.

서명 에도이 방법을 사용하려고 http://codetheory.in/ 에서 샘플을 찾았 습니다 .

jsfiddle에 아래 코드를 추가했습니다.

HTML :

<div id="sketch">
    <canvas id="paint"></canvas>
</div>

자바 펼쳐 :

 (function() {
    var canvas = document.querySelector('#paint');
    var ctx = canvas.getContext('2d');

    var sketch = document.querySelector('#sketch');
    var sketch_style = getComputedStyle(sketch);
    canvas.width = parseInt(sketch_style.getPropertyValue('width'));
    canvas.height = parseInt(sketch_style.getPropertyValue('height'));

    var mouse = {x: 0, y: 0};
    var last_mouse = {x: 0, y: 0};

    /* Mouse Capturing Work */
    canvas.addEventListener('mousemove', function(e) {
        last_mouse.x = mouse.x;
        last_mouse.y = mouse.y;

        mouse.x = e.pageX - this.offsetLeft;
        mouse.y = e.pageY - this.offsetTop;
    }, false);


    /* Drawing on Paint App */
    ctx.lineWidth = 5;
    ctx.lineJoin = 'round';
    ctx.lineCap = 'round';
    ctx.strokeStyle = 'blue';

    canvas.addEventListener('mousedown', function(e) {
        canvas.addEventListener('mousemove', onPaint, false);
    }, false);

    canvas.addEventListener('mouseup', function() {
        canvas.removeEventListener('mousemove', onPaint, false);
    }, false);

    var onPaint = function() {
        ctx.beginPath();
        ctx.moveTo(last_mouse.x, last_mouse.y);
        ctx.lineTo(mouse.x, mouse.y);
        ctx.closePath();
        ctx.stroke();
    };

}());

다음은 매우 간단한 작업 캔버스 그리기 및 지우기입니다.

https://jsfiddle.net/richardcwc/d2gxjdva/

//Canvas
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
//Variables
var canvasx = $(canvas).offset().left;
var canvasy = $(canvas).offset().top;
var last_mousex = last_mousey = 0;
var mousex = mousey = 0;
var mousedown = false;
var tooltype = 'draw';

//Mousedown
$(canvas).on('mousedown', function(e) {
    last_mousex = mousex = parseInt(e.clientX-canvasx);
	last_mousey = mousey = parseInt(e.clientY-canvasy);
    mousedown = true;
});

//Mouseup
$(canvas).on('mouseup', function(e) {
    mousedown = false;
});

//Mousemove
$(canvas).on('mousemove', function(e) {
    mousex = parseInt(e.clientX-canvasx);
    mousey = parseInt(e.clientY-canvasy);
    if(mousedown) {
        ctx.beginPath();
        if(tooltype=='draw') {
            ctx.globalCompositeOperation = 'source-over';
            ctx.strokeStyle = 'black';
            ctx.lineWidth = 3;
        } else {
            ctx.globalCompositeOperation = 'destination-out';
            ctx.lineWidth = 10;
        }
        ctx.moveTo(last_mousex,last_mousey);
        ctx.lineTo(mousex,mousey);
        ctx.lineJoin = ctx.lineCap = 'round';
        ctx.stroke();
    }
    last_mousex = mousex;
    last_mousey = mousey;
    //Output
    $('#output').html('current: '+mousex+', '+mousey+'<br/>last: '+last_mousex+', '+last_mousey+'<br/>mousedown: '+mousedown);
});

//Use draw|erase
use_tool = function(tool) {
    tooltype = tool; //update
}
canvas {
    cursor: crosshair;
    border: 1px solid #000000;
}
<canvas id="canvas" width="800" height="500"></canvas>
<input type="button" value="draw" onclick="use_tool('draw');" />
<input type="button" value="erase" onclick="use_tool('erase');" />
<div id="output"></div>

Alco 확인 :
예 :
https://github.com/williammalone/Simple-HTML5-Drawing-App

문서 :
http://www.williammalone.com/articles/create-html5-canvas-javascript-drawing-app/

이 문서에는 다음 코드가 포함되어 있습니다.

HTML :

<canvas id="canvas" width="490" height="220"></canvas>

JS :

context = document.getElementById('canvas').getContext("2d");

$('#canvas').mousedown(function(e){
  var mouseX = e.pageX - this.offsetLeft;
  var mouseY = e.pageY - this.offsetTop;

  paint = true;
  addClick(e.pageX - this.offsetLeft, e.pageY - this.offsetTop);
  redraw();
});

$('#canvas').mouseup(function(e){
  paint = false;
});

$('#canvas').mouseleave(function(e){
  paint = false;
});

var clickX = new Array();
var clickY = new Array();
var clickDrag = new Array();
var paint;

function addClick(x, y, dragging)
{
  clickX.push(x);
  clickY.push(y);
  clickDrag.push(dragging);
}

//Also redraw
function redraw(){
  context.clearRect(0, 0, context.canvas.width, context.canvas.height); // Clears the canvas

  context.strokeStyle = "#df4b26";
  context.lineJoin = "round";
  context.lineWidth = 5;

  for(var i=0; i < clickX.length; i++) {        
    context.beginPath();
    if(clickDrag[i] && i){
      context.moveTo(clickX[i-1], clickY[i-1]);
     }else{
       context.moveTo(clickX[i]-1, clickY[i]);
     }
     context.lineTo(clickX[i], clickY[i]);
     context.closePath();
     context.stroke();
  }
}

그리고 또 다른 멋진 예
http://perfectionkills.com/exploring-canvas-drawing-techniques/

이 주제에 대한 간단한 예를 제공해야 할 때에 공유하겠습니다.

http://jsfiddle.net/Haelle/v6tfp2e1

class SignTool {
  constructor() {
    this.initVars()
    this.initEvents()
  }

  initVars() {
    this.canvas = $('#canvas')[0]
    this.ctx = this.canvas.getContext("2d")
    this.isMouseClicked = false
    this.isMouseInCanvas = false
    this.prevX = 0
    this.currX = 0
    this.prevY = 0
    this.currY = 0
  }

  initEvents() {
    $('#canvas').on("mousemove", (e) => this.onMouseMove(e))
    $('#canvas').on("mousedown", (e) => this.onMouseDown(e))
    $('#canvas').on("mouseup", () => this.onMouseUp())
    $('#canvas').on("mouseout", () => this.onMouseOut())
    $('#canvas').on("mouseenter", (e) => this.onMouseEnter(e))
  }
  
  onMouseDown(e) {
  	this.isMouseClicked = true
    this.updateCurrentPosition(e)
  }
  
  onMouseUp() {
  	this.isMouseClicked = false
  }
  
  onMouseEnter(e) {
  	this.isMouseInCanvas = true
    this.updateCurrentPosition(e)
  }
  
  onMouseOut() {
  	this.isMouseInCanvas = false
  }

  onMouseMove(e) {
    if (this.isMouseClicked && this.isMouseInCanvas) {
    	this.updateCurrentPosition(e)
      this.draw()
    }
  }
  
  updateCurrentPosition(e) {
      this.prevX = this.currX
      this.prevY = this.currY
      this.currX = e.clientX - this.canvas.offsetLeft
      this.currY = e.clientY - this.canvas.offsetTop
  }
  
  draw() {
    this.ctx.beginPath()
    this.ctx.moveTo(this.prevX, this.prevY)
    this.ctx.lineTo(this.currX, this.currY)
    this.ctx.strokeStyle = "black"
    this.ctx.lineWidth = 2
    this.ctx.stroke()
    this.ctx.closePath()
  }
}

var canvas = new SignTool()
canvas {
  position: absolute;
  border: 2px solid;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="canvas" width="500" height="300"></canvas>

구현하는 데 문제가 있으면 알려주세요. processing.js를 사용하고 색상을 변경하고 그리기 포인트를 더 선호하는 작게 만드는 기능을 가지고 있습니다.

<html>
<head>
<!--script librarires-->
<script type="text/javascript" src="processing.js"></script>
<script type="text/javascript" src="init.js"></script>

<!--styles -->
<style type="text/css" src="stylesheet.css">
</style> 
</head>
<body>
<!--toolbox -->
<div id="draggable toolbox"></div>
<script type="application/processing">
// new script
int prevx, prevy;
int newx, newy;
boolean cliked;
color c1 = #000000;
int largeur=2;
int ps = 20;
int px = 50;
int py = 50;

void setup() {
size(500,500);
frameRate(25);
background(50);

 prevx = mouseX;
 prevy = mouseY;
 cliked = false;
 }

void draw() {
 //couleur
 noStroke(0);
 fill(#FFFFFF);//blanc
rect(px, py, ps, ps);
 fill(#000000);
 rect(px, py+(ps), ps, ps);
 fill(#FF0000);
 rect(px, py+(ps*2), ps, ps);
 fill(#00FF00);
 rect(px, py+(ps*3), ps, ps);
 fill(#FFFF00);
 rect(px, py+(ps*4), ps, ps);
 fill(#0000FF);
 rect(px, py+(ps*5), ps, ps);
 //largeur
 fill(#FFFFFF);
 rect(px, py+(ps*7), ps, ps);
  fill(#FFFFFF);
 rect(px, py+(ps*8), ps, ps);
 stroke(#000000);
 line(px+2, py+(ps*7)+(ps/2), px+(ps-2), py+(ps*7)+(ps/2));
 line(px+(ps/2), py+(ps*7)+1, px+(ps/2), py+(ps*8)-1);
 line(px+2, py+(ps*8)+(ps/2), px+(ps-2), py+(ps*8)+(ps/2));

 if(cliked==false){
  prevx = mouseX;
 prevy = mouseY;  
 }
 if(mousePressed) { 
  cliked = true;
 newx = mouseX;
  newy = mouseY;
  strokeWeight(largeur);
  stroke(c1);
  line(prevx, prevy, newx, newy);
  prevx = newx;
 prevy = newy;
 }else{
  cliked= false;
  }
}
void mouseClicked() {
 if (mouseX>=px && mouseX<=(px+ps)){
  //couleur
  if (mouseY>=py && mouseY<=py+(ps*6)){ 
   c1 = get(mouseX, mouseY);
  }
   //largeur
  if (mouseY>=py+(ps*7) && mouseY<=py+(ps*8)){ 
   largeur += 2;
  }
 if (mouseY>=py+(ps*8) && mouseY<=py+(ps*9)){ 
   if (largeur>2){
    largeur -= 2;
   }
  }
 }
}
</script><canvas></canvas>
</body>
</html>

캔버스의 배경 이미지가있는 경우 흰색 지우기 트릭이 배경을 숨길 수 있기 때문에 작동하도록 약간의 조정이 필요합니다.

여기 에 코드 의 요점 이 있습니다.

<html>
    <script type="text/javascript">
    var canvas, canvasimg, backgroundImage, finalImg;
    var mouseClicked = false;
    var prevX = 0;
    var currX = 0;
    var prevY = 0;
    var currY = 0;
    var fillStyle = "black";
    var globalCompositeOperation = "source-over";
    var lineWidth = 2;

    function init() {
      var imageSrc = '/abstract-geometric-pattern_23-2147508597.jpg'
      backgroundImage = new Image();
      backgroundImage.src = imageSrc;
      canvas = document.getElementById('can');
      finalImg = document.getElementById('finalImg');
      canvasimg = document.getElementById('canvasimg');
      canvas.style.backgroundImage = "url('" + imageSrc + "')";
      canvas.addEventListener("mousemove", handleMouseEvent);
      canvas.addEventListener("mousedown", handleMouseEvent);
      canvas.addEventListener("mouseup", handleMouseEvent);
      canvas.addEventListener("mouseout", handleMouseEvent);
    }

    function getColor(btn) {
      globalCompositeOperation = 'source-over';
      lineWidth = 2;
      switch (btn.getAttribute('data-color')) {
        case "green":
        fillStyle = "green";
        break;
        case "blue":
        fillStyle = "blue";
        break;
        case "red":
        fillStyle = "red";
        break;
        case "yellow":
        fillStyle = "yellow";
        break;
        case "orange":
        fillStyle = "orange";
        break;
        case "black":
        fillStyle = "black";
        break;
        case "eraser":
        globalCompositeOperation = 'destination-out';
        fillStyle = "rgba(0,0,0,1)";
        lineWidth = 14;
        break;
      }

    }

    function draw(dot) {
      var ctx = canvas.getContext("2d");
      ctx.beginPath();
      ctx.globalCompositeOperation = globalCompositeOperation;
      if(dot){
        ctx.fillStyle = fillStyle;
        ctx.fillRect(currX, currY, 2, 2);
      } else {
        ctx.beginPath();
        ctx.moveTo(prevX, prevY);
        ctx.lineTo(currX, currY);
        ctx.strokeStyle = fillStyle;
        ctx.lineWidth = lineWidth;
        ctx.stroke();
      }
      ctx.closePath();
    }

    function erase() {
      if (confirm("Want to clear")) {
        var ctx = canvas.getContext("2d");
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        document.getElementById("canvasimg").style.display = "none";
      }
    }

    function save() {
      canvas.style.border = "2px solid";
      canvasimg.width = canvas.width;
      canvasimg.height = canvas.height;
      var ctx2 = canvasimg.getContext("2d");
      // comment next line to save the draw only
      ctx2.drawImage(backgroundImage, 0, 0);
      ctx2.drawImage(canvas, 0, 0);
      finalImg.src = canvasimg.toDataURL();
      finalImg.style.display = "inline";
    }

    function handleMouseEvent(e) {
      if (e.type === 'mousedown') {
        prevX = currX;
        prevY = currY;
        currX = e.offsetX;
        currY = e.offsetY;
        mouseClicked = true;
        draw(true);
      }
      if (e.type === 'mouseup' || e.type === "mouseout") {
        mouseClicked = false;
      }
      if (e.type === 'mousemove') {
        if (mouseClicked) {
          prevX = currX;
          prevY = currY;
          currX = e.offsetX;
          currY = e.offsetY;
          draw();
        }
      }
    }
    </script>
    <body onload="init()">
      <canvas id="can" width="400" height="400" style="position:absolute;top:10%;left:10%;border:2px solid;">
      </canvas>
      <div style="position:absolute;top:12%;left:43%;">Choose Color</div>
      <div style="position:absolute;top:15%;left:45%;width:10px;height:10px;background:green;" data-color="green" onclick="getColor(this)"></div>
      <div style="position:absolute;top:15%;left:46%;width:10px;height:10px;background:blue;" data-color="blue" onclick="getColor(this)"></div>
      <div style="position:absolute;top:15%;left:47%;width:10px;height:10px;background:red;" data-color="red" onclick="getColor(this)"></div>
      <div style="position:absolute;top:17%;left:45%;width:10px;height:10px;background:yellow;" data-color="yellow" onclick="getColor(this)"></div>
      <div style="position:absolute;top:17%;left:46%;width:10px;height:10px;background:orange;" data-color="orange" onclick="getColor(this)"></div>
      <div style="position:absolute;top:17%;left:47%;width:10px;height:10px;background:black;" data-color="black" onclick="getColor(this)"></div>
      <div style="position:absolute;top:20%;left:43%;">Eraser</div>
      <div style="position:absolute;top:22%;left:45%;width:15px;height:15px;background:white;border:2px solid;" data-color="eraser" onclick="getColor(this)"></div>
      <canvas id="canvasimg" style="display:none;" ></canvas>
      <img id="finalImg" style="position:absolute;top:10%;left:52%;display:none;" >
      <input type="button" value="save" id="btn" size="30" onclick="save()" style="position:absolute;top:55%;left:10%;">
      <input type="button" value="clear" id="clr" size="23" onclick="erase()" style="position:absolute;top:55%;left:15%;">
    </body>
    </html>

질문을 받고 답변을받은 지 몇 년이 지났습니다.

간단한 그리기 캔버스 (예 : 사용자 / 고객 서명을받는 경우)를 찾는 모든 사람을 위해 현재 허용되는 답변의보다 단순화 된 jquery 버전을 게시합니다.

$(document).ready(function() {
  var flag, dot_flag = false,
	prevX, prevY, currX, currY = 0,
	color = 'black', thickness = 2;
  var $canvas = $('#canvas');
  var ctx = $canvas[0].getContext('2d');

  $canvas.on('mousemove mousedown mouseup mouseout', function(e) {
    prevX = currX;
    prevY = currY;
    currX = e.clientX - $canvas.offset().left;
    currY = e.clientY - $canvas.offset().top;
    if (e.type == 'mousedown') {
      flag = true;
    }
    if (e.type == 'mouseup' || e.type == 'mouseout') {
      flag = false;
    }
    if (e.type == 'mousemove') {
      if (flag) {
        ctx.beginPath();
        ctx.moveTo(prevX, prevY);
        ctx.lineTo(currX, currY);
        ctx.strokeStyle = color;
        ctx.lineWidth = thickness;
        ctx.stroke();
        ctx.closePath();
      }
    }
  });

  $('.canvas-clear').on('click', function(e) {
    c_width = $canvas.width();
    c_height = $canvas.height();
    ctx.clearRect(0, 0, c_width, c_height);
    $('#canvasimg').hide();
  });
});
<html>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
  <body>
    <canvas id="canvas" width="400" height="400" style="position:absolute;top:10%;left:10%;border:2px solid;"></canvas>
    <input type="button" value="Clear" class="canvas-clear" />
  </body>
</html>

참고 URL : https://stackoverflow.com/questions/2368784/draw-on-html5-canvas-using-a-mouse

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