Drawing branches on a retina compatible canvas

Developer
Daformat
Size
3,777 Kb
Views
24,288
  1. Drawing branches on a retina compatible canvas Previews
  2. Drawing branches on a retina compatible canvas HTML Codes
  3. Drawing branches on a retina compatible canvas CSS Codes
  4. Drawing branches on a retina compatible canvas JS Codes

How do I make an drawing branches on a retina compatible canvas?

Draws branches based on a random number of source / destination. Retina and hi-dpi compatible with canvas upscaling. What is a drawing branches on a retina compatible canvas? How do you make a drawing branches on a retina compatible canvas? This script and codes were developed by Daformat on 10 September 2022, Saturday.

Drawing branches on a retina compatible canvas Previews
IQ Test

Drawing branches on a retina compatible canvas - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Drawing branches on a retina compatible canvas</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <!-- Drawing branches with canvas ---------------------------- By @daformat Arrow head code found on: http://stackoverflow.com/questions/6576827/html-canvas-draw-curved-arrows To make it work on a Bezier curve, you need to provide the last control point's coordinate as the two first params of the "findAngle" function. The two last params should be the coordinates of the end point
-->
<div id="container"> <h2>Drawing branches with canvas</h2> <p>by <a href="https://twitter.com/daformat" target="_blank">@daformat</a></p> <p>Random number of branches on each side</p> <p>Retina compatible with canvas upscaling</p> <div> <canvas id="canvas" width="600" height="300"></canvas> </div> <aside> <h4>Max</h4> <p> <input id="max" type="range" value="5" min=1 max=15></input> <span id="maxValue"></span> </p> </aside> <p class="actual">Actual params: <span id="counter"></span></p>
</div> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

Drawing branches on a retina compatible canvas - Script Codes CSS Codes

html{ width: 100%; height: 100%;
}
body{ font-family: Helvetica, Arial, sans-serif; background: #eee; color: #444; display: table; position: absolute; top:0; left:0; bottom: 0; right: 0; width: 100%; height: 100%
}
h2{ margin-top: 50px; color: #555; font-weight: 100; margin-bottom: 15px
}
p{ margin: 0; margin-bottom:10px
}
#container{ display: table-cell; width:100%; text-align: center; vertical-align:middle}
#canvas{ display: inline-block; margin-top: 40px; margin-bottom: 40px; box-shadow: 1px 1px 4px rgba(0,0,0,0.35); background:#f2f2f2; border: 4px solid white;
}
aside{ font-size: 14px; line-height: 1; color: #eee; display: inline-block; padding: 7px 30px; background: rgba(0,0,0,0.8); border-radius: 80px; border: 2px solid white; box-shadow: 1px 1px 4px rgba(0,0,0,0.5); width: 340px; margin-bottom: 20px
}
h4{ margin: 5px
}
aside p{ margin: 5px 0 10px 0;
}
aside input{ margin: 5px; width: 300px;
}
.actual{ font-size: 12px;
}

Drawing branches on a retina compatible canvas - Script Codes JS Codes

// returns radians
function findAngle( sx, sy, ex, ey) { // make sx and sy at the zero point return Math.atan2((ey - sy) , (ex - sx));
}
function drawArrowhead(ctx, locx, locy, angle, sizex, sizey) { var hx = sizex / 2; var hy = sizey / 2; console.log(arguments); ctx.translate((locx ), (locy)); ctx.rotate(angle); ctx.translate(-hx,-hy); ctx.beginPath(); ctx.moveTo(0,0); ctx.lineTo(0,1*sizey); ctx.lineTo(1*sizex,1*hy); ctx.closePath(); ctx.fill();
}
function drawLine(ctx, sx, sy, ex, ey){ var xPosDiffers = (sx !== ex), yPosDiffers = (sy !== ey); ctx.save(); if ( xPosDiffers || yPosDiffers ){ ctx.beginPath(); ctx.moveTo(sx,sy); ctx.lineTo(ex,ey); ctx.stroke(); ctx.closePath(); } ctx.restore();
}
function drawBranch(drawBase, drawHead, $canvas, sx, sy, ex, ey){ var xPosDiffers = (sx !== ex), yPosDiffers = (sy !== ey), ang, ctx = $canvas[0].getContext('2d'), scale = $canvas.data('scale'); ctx.save();
console.log('Scale', scale); if ( xPosDiffers && yPosDiffers ){ // both x and y coordinates differ, let's go with a bezier curve var w = (ex-sx)/2; ctx.beginPath(); ctx.moveTo(sx,sy); ctx.bezierCurveTo(sx+w,sy,ex-w,ey,ex,ey); ctx.stroke(); ctx.closePath(); ang = findAngle(ex-w, ey, ex, ey); if(drawHead){ drawArrowhead(ctx, ex, ey, ang, 12*scale.x, 12*scale.y); } } else if ( xPosDiffers && !yPosDiffers) { // only the x position differs, let's draw a straight line ctx.beginPath(); drawLine(ctx, sx, sy, ex, ey); ctx.closePath(); ang = findAngle(sx, sy, ex, ey); if(drawHead){ drawArrowhead(ctx, ex, ey, ang, 12*scale.x, 12*scale.y); } } ctx.restore(); if( drawBase && (xPosDiffers || yPosDiffers) ) { ctx.beginPath(); ctx.rect(sx-5*scale.x, sy-5*scale.y, 10*scale.x, 10*scale.y); ctx.fill(); ctx.closePath(); }
}
function prepareCanvasForRetina($canvas){ // @2x var c = $canvas[0]; c.width = c.width; c.style.width = c.width+'px'; c.style.height = c.height+'px'; var scale = {x: 2, y:2}; $canvas.data('scale', scale); c.width = c.width * scale.x; c.height = c.height *scale.y; c.getContext('2d').scale( scale.x, scale.y); return $canvas;
}
function drawRelations($canvas, s1, s2){ console.log('Draw relations', arguments); var c = $canvas[0], ctx = c.getContext('2d'), padding = 40*$canvas.data('scale').x, height = c.height-2*padding, width = c.width-2*padding, middle = { x: (c.width-2*padding)/2 + padding - 4, y: (c.height-2*padding)/2 + padding, }, average = Math.max(s1.length, s2.length), scale = $canvas.data('scale'); // clear the canvas first c.width = c.width; console.log(ctx, width, height); ctx.strokeStyle = '#666'; ctx.fillStyle = '#333'; ctx.lineWidth = 4 * scale.x; var i, yStep, xStep = middle.x; yStep = s1.length > 0 ? height / (s1.length-1) : 0; for ( i = 0; i < s1.length; i++) { drawBranch(true, false, $canvas, padding, (s1.length>1 ? padding + (i*yStep) : middle.y) , middle.x, middle.y); } yStep = s2.length > 0 ? height / (s2.length-1) : 0; for ( i = 0; i < s2.length; i++) { drawBranch(false, true, $canvas, middle.x, middle.y, width +padding, (s2.length>1 ? padding + (i*yStep) : middle.y) ); }
}
$(function(){ prepareCanvasForRetina($('#canvas')); var t =window.setInterval(function(){ var m = $('#max').val(); $('#maxValue').text(m) var n1 = Math.round(Math.random()*m), n2 = Math.round(Math.random()*m); $('#counter').html('<strong>'+n1+'</strong> left, <strong>'+n2+'</strong> right'); drawRelations($('#canvas'),new Array(n1),new Array(n2))}, 800) });
Drawing branches on a retina compatible canvas - Script Codes
Drawing branches on a retina compatible canvas - Script Codes
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Developer Daformat
Username daformat
Uploaded September 10, 2022
Rating 3
Size 3,777 Kb
Views 24,288
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Daformat (daformat) Script Codes
Name
Drawing branches with canvas
Simple growing tree svg animation
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