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