97 lines
2.4 KiB
JavaScript
97 lines
2.4 KiB
JavaScript
var canvas = document.getElementById('meme-canvas');
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var img = document.getElementById('start-image');
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var canvasWidth;
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var canvasHeight;
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var fontSize = 28;
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var topText = document.getElementById('top-text');
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var bottomText = document.getElementById('bottom-text');
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var ctx = canvas.getContext('2d');
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var claimNameInput = document.getElementById("file-name-input");
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// create the canvas
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img.onload = function() {
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// get dimensions of the start img
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canvasWidth = img.width;
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canvasHeight = img.height;
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// hide start image
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img.hidden = true;
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// size the canvas
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canvas.width = canvasWidth;
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canvas.height = canvasHeight;
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// draw the starting meme
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drawMeme()
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}
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function newCanvas(image){
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// hide start image
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img = image;
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// get dimensions of the start img
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canvasHeight = canvasWidth * (img.height / img.width);
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// size the canvas
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canvas.width = canvasWidth;
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canvas.height = canvasHeight;
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// draw the meme
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drawMeme()
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}
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// if the text changes, re-draw the meme
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topText.addEventListener('keyup', drawMeme);
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bottomText.addEventListener('keyup', drawMeme);
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// draw the image and draw the text over it
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function drawMeme() {
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ctx.clearRect(0, 0, canvasWidth, canvasHeight);
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ctx.drawImage(img, 0, 0, canvasWidth, canvasHeight);
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ctx.lineWidth = 4;
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ctx.font = fontSize + 'px sans-serif';
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ctx.strokeStyle = 'black';
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ctx.fillStyle = 'white';
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ctx.textAlign = 'center';
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ctx.textBaseline = 'top';
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var text1 = topText.value;
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text1 = text1.toUpperCase();
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x = canvasWidth / 2;
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y = 5;
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wrapText(ctx, text1, x, y, canvasWidth, fontSize, false);
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ctx.textBaseline = 'bottom';
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var text2 = bottomText.value;
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text2 = text2.toUpperCase();
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y = canvasHeight - 5;
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wrapText(ctx, text2, x, y, canvasHeight, fontSize, true);
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}
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function wrapText(context, text, x, y, maxWidth, lineHeight, fromBottom) {
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var pushMethod = (fromBottom)?'unshift':'push';
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lineHeight = (fromBottom)?-lineHeight:lineHeight;
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var lines = [];
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var y = y;
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var line ='';
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var words = text.split(' ');
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for (var i = 0; i < words.length; i++) {
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var testLine = line + ' ' + words[i];
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var metrics = context.measureText(testLine);
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var testWidth = metrics.width;
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if (testWidth > maxWidth) {
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lines[pushMethod](line);
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line = words[i] + ' ';
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} else {
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line = testLine;
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}
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}
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lines[pushMethod](line);
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for (var k in lines ) {
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context.strokeText(lines[k], x, y + lineHeight * k);
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context.fillText(lines[k], x, y + lineHeight * k);
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}
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} |