Drag and drop a moving ball around canvas












1















I have a red ball which moves in a specific path and 2 buttons to start and stop it's movement. I want to stop sometime the ball an then move it in another position of the path and then start it's movement again. Here is what i have done until now, but i did not managed to make it. My code runs and no errors appear but i can't drag or drop my ball to the position i want. Does anyone knows what i am doing wrong or why this happens??
Thanks in advance!!!



<!DOCTYPE html>

<html> 

 <head>

    <title> example </title> 



</head>

<body>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

    <button type='button' id='start'>START</button>

    <button type='button'  id='stop'>STOP</button>

    <br>

    <canvas id="myCanvas" width="1515" height="950" style="border:1px solid #d3d3d3;">

Your browser does not support the HTML5 canvas tag.</canvas>



</body>

</html>


script



<script>

    var canvas = document.getElementById("myCanvas");

    var ctx = canvas.getContext("2d");



    window.requestAnimFrame = (function (callback) {

        return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {

        window.setTimeout(callback, 1000 / 60);

        };

    })();



    var dragok = false;



    function MouseDown(e){

        x = e.pageX - canvas.offsetLeft;

        y = e.pageY - canvas.offsetTop;

        dragok = true;

        canvas.onmousemove = MouseMove;

    }



    function MouseUp(e){

        dragok = false;

        canvas.onmousemove = null;

    }



    function MouseMove(e){

        if (dragok){

            x = e.pageX - canvas.offsetLeft;

            y = e.pageY - canvas.offsetTop;

        }

    }



    canvas.onmousedown = MouseDown;

    canvas.onmouseup = MouseUp;



    var pathArray = ;

    pathArray.push({

      x: 140,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 230

    });

    pathArray.push({

      x: 140,

      y: 230

    });

    pathArray.push({

    x: 140,

    y: 320

    });

    pathArray.push({

      x: 1375,

      y: 320

    });

    pathArray.push({

      x: 1375,

      y: 450

    });

    pathArray.push({

      x: 140,

      y: 450

   });

   pathArray.push({

      x: 140,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 670

   });

   pathArray.push({

      x: 140,

      y: 670

   });



    var polypoints = makePolyPoints(pathArray, 5);  

    var width = 15;

    var height = 30;

    var speed = 1/2;

    var stopAnimation = true;

    var position = 0; 





    function drawBall(){

        ctx.beginPath();

        ctx.arc(150, 85, 12, 0, 2*Math.PI);

        ctx.fillStyle = "#B22222";

        ctx.fill();

    }



    drawBall();



    // start animation 

    $('#start').on('click',function(){

        stopAnimation = false;

        requestAnimFrame(animate);

    });



    // stop animation 

    $('#stop').on('click',function(){

        stopAnimation = true;

    });



    animate();



    function animate(){

        if(stopAnimation){return;}

        setTimeout(function () {

            requestAnimFrame(animate);

            position += speed;

            if (position> polypoints.length - 1) {

                return;

            }

            var pt = polypoints[position];

            if(pt){

                ctx.save();

                ctx.beginPath();

                ctx.translate(pt.x, pt.y);

                ctx.arc(-width / 2, -height / 2, 12, 0, 2*Math.PI);

                ctx.fillStyle = "#B22222";

                ctx.fill();

                ctx.restore();

            }

        }, 1000 / 60);

    }



    function makePolyPoints(pathArray, speedFactor) {

        var points = ;

        for (var i = 1; i < pathArray.length; i++) {

            var startPt = pathArray[i - 1];

            var endPt = pathArray[i];

            var dx = endPt.x - startPt.x;

            var dy = endPt.y - startPt.y;

            var distance = Math.sqrt(dx*dx+dy*dy)

            var steps = distance/speedFactor

            for (var n = 0; n <= steps; n++) {

                var x = startPt.x + dx * n / steps;

                var y = startPt.y + dy * n / steps;

                points.push({

                x: x,

                y: y

                });

            }

        }

        return (points);

    }





</script>





javascript html5 canvas javascript-events html5-canvas







share|improve this question

























  • One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

    – enxaneta
    Nov 13 '18 at 20:11











  • That was a copy-paste mistake, but thank you for your note!

    – dim109
    Nov 13 '18 at 20:36
















1















I have a red ball which moves in a specific path and 2 buttons to start and stop it's movement. I want to stop sometime the ball an then move it in another position of the path and then start it's movement again. Here is what i have done until now, but i did not managed to make it. My code runs and no errors appear but i can't drag or drop my ball to the position i want. Does anyone knows what i am doing wrong or why this happens??
Thanks in advance!!!



<!DOCTYPE html>

<html> 

 <head>

    <title> example </title> 



</head>

<body>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

    <button type='button' id='start'>START</button>

    <button type='button'  id='stop'>STOP</button>

    <br>

    <canvas id="myCanvas" width="1515" height="950" style="border:1px solid #d3d3d3;">

Your browser does not support the HTML5 canvas tag.</canvas>



</body>

</html>


script



<script>

    var canvas = document.getElementById("myCanvas");

    var ctx = canvas.getContext("2d");



    window.requestAnimFrame = (function (callback) {

        return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {

        window.setTimeout(callback, 1000 / 60);

        };

    })();



    var dragok = false;



    function MouseDown(e){

        x = e.pageX - canvas.offsetLeft;

        y = e.pageY - canvas.offsetTop;

        dragok = true;

        canvas.onmousemove = MouseMove;

    }



    function MouseUp(e){

        dragok = false;

        canvas.onmousemove = null;

    }



    function MouseMove(e){

        if (dragok){

            x = e.pageX - canvas.offsetLeft;

            y = e.pageY - canvas.offsetTop;

        }

    }



    canvas.onmousedown = MouseDown;

    canvas.onmouseup = MouseUp;



    var pathArray = ;

    pathArray.push({

      x: 140,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 230

    });

    pathArray.push({

      x: 140,

      y: 230

    });

    pathArray.push({

    x: 140,

    y: 320

    });

    pathArray.push({

      x: 1375,

      y: 320

    });

    pathArray.push({

      x: 1375,

      y: 450

    });

    pathArray.push({

      x: 140,

      y: 450

   });

   pathArray.push({

      x: 140,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 670

   });

   pathArray.push({

      x: 140,

      y: 670

   });



    var polypoints = makePolyPoints(pathArray, 5);  

    var width = 15;

    var height = 30;

    var speed = 1/2;

    var stopAnimation = true;

    var position = 0; 





    function drawBall(){

        ctx.beginPath();

        ctx.arc(150, 85, 12, 0, 2*Math.PI);

        ctx.fillStyle = "#B22222";

        ctx.fill();

    }



    drawBall();



    // start animation 

    $('#start').on('click',function(){

        stopAnimation = false;

        requestAnimFrame(animate);

    });



    // stop animation 

    $('#stop').on('click',function(){

        stopAnimation = true;

    });



    animate();



    function animate(){

        if(stopAnimation){return;}

        setTimeout(function () {

            requestAnimFrame(animate);

            position += speed;

            if (position> polypoints.length - 1) {

                return;

            }

            var pt = polypoints[position];

            if(pt){

                ctx.save();

                ctx.beginPath();

                ctx.translate(pt.x, pt.y);

                ctx.arc(-width / 2, -height / 2, 12, 0, 2*Math.PI);

                ctx.fillStyle = "#B22222";

                ctx.fill();

                ctx.restore();

            }

        }, 1000 / 60);

    }



    function makePolyPoints(pathArray, speedFactor) {

        var points = ;

        for (var i = 1; i < pathArray.length; i++) {

            var startPt = pathArray[i - 1];

            var endPt = pathArray[i];

            var dx = endPt.x - startPt.x;

            var dy = endPt.y - startPt.y;

            var distance = Math.sqrt(dx*dx+dy*dy)

            var steps = distance/speedFactor

            for (var n = 0; n <= steps; n++) {

                var x = startPt.x + dx * n / steps;

                var y = startPt.y + dy * n / steps;

                points.push({

                x: x,

                y: y

                });

            }

        }

        return (points);

    }





</script>





javascript html5 canvas javascript-events html5-canvas







share|improve this question

























  • One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

    – enxaneta
    Nov 13 '18 at 20:11











  • That was a copy-paste mistake, but thank you for your note!

    – dim109
    Nov 13 '18 at 20:36














1












1








1








I have a red ball which moves in a specific path and 2 buttons to start and stop it's movement. I want to stop sometime the ball an then move it in another position of the path and then start it's movement again. Here is what i have done until now, but i did not managed to make it. My code runs and no errors appear but i can't drag or drop my ball to the position i want. Does anyone knows what i am doing wrong or why this happens??
Thanks in advance!!!



<!DOCTYPE html>

<html> 

 <head>

    <title> example </title> 



</head>

<body>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

    <button type='button' id='start'>START</button>

    <button type='button'  id='stop'>STOP</button>

    <br>

    <canvas id="myCanvas" width="1515" height="950" style="border:1px solid #d3d3d3;">

Your browser does not support the HTML5 canvas tag.</canvas>



</body>

</html>


script



<script>

    var canvas = document.getElementById("myCanvas");

    var ctx = canvas.getContext("2d");



    window.requestAnimFrame = (function (callback) {

        return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {

        window.setTimeout(callback, 1000 / 60);

        };

    })();



    var dragok = false;



    function MouseDown(e){

        x = e.pageX - canvas.offsetLeft;

        y = e.pageY - canvas.offsetTop;

        dragok = true;

        canvas.onmousemove = MouseMove;

    }



    function MouseUp(e){

        dragok = false;

        canvas.onmousemove = null;

    }



    function MouseMove(e){

        if (dragok){

            x = e.pageX - canvas.offsetLeft;

            y = e.pageY - canvas.offsetTop;

        }

    }



    canvas.onmousedown = MouseDown;

    canvas.onmouseup = MouseUp;



    var pathArray = ;

    pathArray.push({

      x: 140,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 230

    });

    pathArray.push({

      x: 140,

      y: 230

    });

    pathArray.push({

    x: 140,

    y: 320

    });

    pathArray.push({

      x: 1375,

      y: 320

    });

    pathArray.push({

      x: 1375,

      y: 450

    });

    pathArray.push({

      x: 140,

      y: 450

   });

   pathArray.push({

      x: 140,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 670

   });

   pathArray.push({

      x: 140,

      y: 670

   });



    var polypoints = makePolyPoints(pathArray, 5);  

    var width = 15;

    var height = 30;

    var speed = 1/2;

    var stopAnimation = true;

    var position = 0; 





    function drawBall(){

        ctx.beginPath();

        ctx.arc(150, 85, 12, 0, 2*Math.PI);

        ctx.fillStyle = "#B22222";

        ctx.fill();

    }



    drawBall();



    // start animation 

    $('#start').on('click',function(){

        stopAnimation = false;

        requestAnimFrame(animate);

    });



    // stop animation 

    $('#stop').on('click',function(){

        stopAnimation = true;

    });



    animate();



    function animate(){

        if(stopAnimation){return;}

        setTimeout(function () {

            requestAnimFrame(animate);

            position += speed;

            if (position> polypoints.length - 1) {

                return;

            }

            var pt = polypoints[position];

            if(pt){

                ctx.save();

                ctx.beginPath();

                ctx.translate(pt.x, pt.y);

                ctx.arc(-width / 2, -height / 2, 12, 0, 2*Math.PI);

                ctx.fillStyle = "#B22222";

                ctx.fill();

                ctx.restore();

            }

        }, 1000 / 60);

    }



    function makePolyPoints(pathArray, speedFactor) {

        var points = ;

        for (var i = 1; i < pathArray.length; i++) {

            var startPt = pathArray[i - 1];

            var endPt = pathArray[i];

            var dx = endPt.x - startPt.x;

            var dy = endPt.y - startPt.y;

            var distance = Math.sqrt(dx*dx+dy*dy)

            var steps = distance/speedFactor

            for (var n = 0; n <= steps; n++) {

                var x = startPt.x + dx * n / steps;

                var y = startPt.y + dy * n / steps;

                points.push({

                x: x,

                y: y

                });

            }

        }

        return (points);

    }





</script>





javascript html5 canvas javascript-events html5-canvas







share|improve this question
















I have a red ball which moves in a specific path and 2 buttons to start and stop it's movement. I want to stop sometime the ball an then move it in another position of the path and then start it's movement again. Here is what i have done until now, but i did not managed to make it. My code runs and no errors appear but i can't drag or drop my ball to the position i want. Does anyone knows what i am doing wrong or why this happens??
Thanks in advance!!!



<!DOCTYPE html>

<html> 

 <head>

    <title> example </title> 



</head>

<body>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

    <button type='button' id='start'>START</button>

    <button type='button'  id='stop'>STOP</button>

    <br>

    <canvas id="myCanvas" width="1515" height="950" style="border:1px solid #d3d3d3;">

Your browser does not support the HTML5 canvas tag.</canvas>



</body>

</html>


script



<script>

    var canvas = document.getElementById("myCanvas");

    var ctx = canvas.getContext("2d");



    window.requestAnimFrame = (function (callback) {

        return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {

        window.setTimeout(callback, 1000 / 60);

        };

    })();



    var dragok = false;



    function MouseDown(e){

        x = e.pageX - canvas.offsetLeft;

        y = e.pageY - canvas.offsetTop;

        dragok = true;

        canvas.onmousemove = MouseMove;

    }



    function MouseUp(e){

        dragok = false;

        canvas.onmousemove = null;

    }



    function MouseMove(e){

        if (dragok){

            x = e.pageX - canvas.offsetLeft;

            y = e.pageY - canvas.offsetTop;

        }

    }



    canvas.onmousedown = MouseDown;

    canvas.onmouseup = MouseUp;



    var pathArray = ;

    pathArray.push({

      x: 140,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 100

    });

    pathArray.push({

      x: 1375,

      y: 230

    });

    pathArray.push({

      x: 140,

      y: 230

    });

    pathArray.push({

    x: 140,

    y: 320

    });

    pathArray.push({

      x: 1375,

      y: 320

    });

    pathArray.push({

      x: 1375,

      y: 450

    });

    pathArray.push({

      x: 140,

      y: 450

   });

   pathArray.push({

      x: 140,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 540

   });

   pathArray.push({

      x: 1375,

      y: 670

   });

   pathArray.push({

      x: 140,

      y: 670

   });



    var polypoints = makePolyPoints(pathArray, 5);  

    var width = 15;

    var height = 30;

    var speed = 1/2;

    var stopAnimation = true;

    var position = 0; 





    function drawBall(){

        ctx.beginPath();

        ctx.arc(150, 85, 12, 0, 2*Math.PI);

        ctx.fillStyle = "#B22222";

        ctx.fill();

    }



    drawBall();



    // start animation 

    $('#start').on('click',function(){

        stopAnimation = false;

        requestAnimFrame(animate);

    });



    // stop animation 

    $('#stop').on('click',function(){

        stopAnimation = true;

    });



    animate();



    function animate(){

        if(stopAnimation){return;}

        setTimeout(function () {

            requestAnimFrame(animate);

            position += speed;

            if (position> polypoints.length - 1) {

                return;

            }

            var pt = polypoints[position];

            if(pt){

                ctx.save();

                ctx.beginPath();

                ctx.translate(pt.x, pt.y);

                ctx.arc(-width / 2, -height / 2, 12, 0, 2*Math.PI);

                ctx.fillStyle = "#B22222";

                ctx.fill();

                ctx.restore();

            }

        }, 1000 / 60);

    }



    function makePolyPoints(pathArray, speedFactor) {

        var points = ;

        for (var i = 1; i < pathArray.length; i++) {

            var startPt = pathArray[i - 1];

            var endPt = pathArray[i];

            var dx = endPt.x - startPt.x;

            var dy = endPt.y - startPt.y;

            var distance = Math.sqrt(dx*dx+dy*dy)

            var steps = distance/speedFactor

            for (var n = 0; n <= steps; n++) {

                var x = startPt.x + dx * n / steps;

                var y = startPt.y + dy * n / steps;

                points.push({

                x: x,

                y: y

                });

            }

        }

        return (points);

    }





</script>





javascript html5 canvas javascript-events html5-canvas




javascript html5 canvas javascript-events html5-canvas






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 13 '18 at 20:43







dim109

















asked Nov 13 '18 at 19:32









dim109dim109

84




84













  • One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

    – enxaneta
    Nov 13 '18 at 20:11











  • That was a copy-paste mistake, but thank you for your note!

    – dim109
    Nov 13 '18 at 20:36



















  • One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

    – enxaneta
    Nov 13 '18 at 20:11











  • That was a copy-paste mistake, but thank you for your note!

    – dim109
    Nov 13 '18 at 20:36

















One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

– enxaneta
Nov 13 '18 at 20:11





One of the things you are doing wrong is that you try to push your balls in an unexistent array pathArrayBall1

– enxaneta
Nov 13 '18 at 20:11













That was a copy-paste mistake, but thank you for your note!

– dim109
Nov 13 '18 at 20:36





That was a copy-paste mistake, but thank you for your note!

– dim109
Nov 13 '18 at 20:36












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Adding quotations to stringified JSON object values

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0 My stringified object data doesn't include quotation marks around object values, which errors when attempting JSON.parse() : '{ "affiliation": CORPORATE, "userId": 75c35d1c-5d12-4485-8fa8-b2f1551a3e6e }' I need the string to be: '{ "affiliation": "CORPORATE", "userId": "75c35d1c-5d12-4485-8fa8-b2f1551a3e6e" }' I'm using this regex to add quotes to the object keys: var newStr = str.replace(/(['"])?([a-z0-9A-Z_]+)(['"])?:/g, '"$2": '); For instance: '{ affiliation: CORPORATE }' to '{ "affiliation": CORPORATE }' There are only string values in my data, so I don't need to check value types. How can I alter my regex expression to add quotations to
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