Canvas compositing methods

Developer
Ed Ball
Size
2,214 Kb
Views
14,161
  1. Canvas compositing methods Previews
  2. Canvas compositing methods HTML Codes
  3. Canvas compositing methods CSS Codes
  4. Canvas compositing methods JS Codes

How do I make an canvas compositing methods?

Here I've layered three shapes using all the available compositing options. At first I was surprised that some canvases appeared blank and thought I'd made a mistake, but I soon realised that for these methods, unless all the shapes overlap the same part of the canvas, then the canvas will appear blank.. What is a canvas compositing methods? How do you make a canvas compositing methods? This script and codes were developed by Ed Ball on 12 November 2022, Saturday.

Canvas compositing methods Previews
IQ Test

Canvas compositing methods - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Canvas compositing methods</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div class="wrapper"> <div> <p>Source-over</p> <canvas id="source-over" width="200" height="200"></canvas> </div> <div> <p>Source-in</p> <canvas id='source-in' width="200" height="200"></canvas> </div> <div> <p>Source-out</p> <canvas id='source-out' width="200" height="200"></canvas> </div> <div> <p>Source-atop</p> <canvas id='source-atop' width="200" height="200"></canvas> </div> <div> <p>Destination-over</p> <canvas id='destination-over' width="200" height="200"></canvas> </div> <div> <p>Destination-in</p> <canvas id='destination-in' width="200" height="200"></canvas> </div> <div> <p>Destination-out</p> <canvas id='destination-out' width="200" height="200"></canvas> </div> <div> <p>Destination-atop</p> <canvas id='destination-atop' width="200" height="200"></canvas> </div> <div> <p>Lighter</p> <canvas id='lighter' width="200" height="200"></canvas> </div> <div> <p>Darker</p> <canvas id='darker' width="200" height="200"></canvas> </div> <div> <p>Xor</p> <canvas id='xor' width="200" height="200"></canvas> </div> <div> <p>Copy</p> <canvas id='copy' width="200" height="200"></canvas> </div>
</div> <script src="js/index.js"></script>
</body>
</html>

Canvas compositing methods - Script Codes CSS Codes

.wrapper{ max-width:1000px;
}
.wrapper div{ width:200px; height:300px; float:left; margin-right:20px
}
canvas{ border: solid 1px grey
}

Canvas compositing methods - Script Codes JS Codes

var compositeTypes = new Array( "source-over", "source-in", "source-out", "source-atop", "destination-over", "destination-in", "destination-out", "destination-atop", "lighter", "darker", "xor", "copy"
)
for ( i = 0 ; i < 12 ; i++){ var canvas, ctx; canvas = document.getElementById(compositeTypes[i]); ctx = canvas.getContext('2d'); // blue circle ctx.beginPath(); ctx.arc(0, 0, 100, 0, 2 * Math.PI, false); ctx.fillStyle = 'blue'; ctx.fill(); ctx.globalCompositeOperation = compositeTypes[i]; // red rectangle ctx.beginPath(); ctx.rect(50, 50, 100, 100); ctx.fillStyle = 'red'; ctx.fill(); // green circle ctx.beginPath(); ctx.arc(200, 200, 100, 0, 2 * Math.PI, false); ctx.fillStyle = 'green'; ctx.fill();
}
Canvas compositing methods - Script Codes
Canvas compositing methods - Script Codes
Home Page Home
Developer Ed Ball
Username edball
Uploaded November 12, 2022
Rating 3.5
Size 2,214 Kb
Views 14,161
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