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Limit crop to the maximum size of outputted canvas

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Niklas von Hertzen 2014-03-04 21:54:24 +02:00
parent 0187fcab42
commit bb8c5a973b
3 changed files with 11 additions and 7 deletions
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8
build/html2canvas.js
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@ -56,11 +56,13 @@ function renderDocument(document, options, windowWidth, windowHeight) {
function crop(canvas, bounds) {
var croppedCanvas = document.createElement("canvas");
var width = croppedCanvas.width = Math.max(Math.min(0, bounds.left) + bounds.width, 1);
var height = croppedCanvas.height = Math.max(Math.min(0, bounds.top) + bounds.height, 1);
var left = Math.max(0, bounds.left);
var top = Math.max(0, bounds.top);
var width = croppedCanvas.width = Math.min(left + canvas.width, Math.max(Math.min(0, bounds.left) + bounds.width, 1));
var height = croppedCanvas.height = Math.min(top + canvas.height, Math.max(Math.min(0, bounds.top) + bounds.height, 1));
log("Cropping canvas at:", "left:", bounds.left, "top:", bounds.top, "width:", bounds.width, "height:", bounds.height);
log("Resulting crop with width", width, "and height", height);
croppedCanvas.getContext("2d").drawImage(canvas, Math.max(0, bounds.left), Math.max(0, bounds.top), width, height, 0, 0, width, height);
croppedCanvas.getContext("2d").drawImage(canvas, left, top, width, height, 0, 0, width, height);
return croppedCanvas;
}

2
build/html2canvas.min.js vendored
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File diff suppressed because one or more lines are too long

8
src/core.js
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@ -47,11 +47,13 @@ function renderDocument(document, options, windowWidth, windowHeight) {
function crop(canvas, bounds) {
var croppedCanvas = document.createElement("canvas");
var width = croppedCanvas.width = Math.max(Math.min(0, bounds.left) + bounds.width, 1);
var height = croppedCanvas.height = Math.max(Math.min(0, bounds.top) + bounds.height, 1);
var left = Math.max(0, bounds.left);
var top = Math.max(0, bounds.top);
var width = croppedCanvas.width = Math.min(left + canvas.width, Math.max(Math.min(0, bounds.left) + bounds.width, 1));
var height = croppedCanvas.height = Math.min(top + canvas.height, Math.max(Math.min(0, bounds.top) + bounds.height, 1));
log("Cropping canvas at:", "left:", bounds.left, "top:", bounds.top, "width:", bounds.width, "height:", bounds.height);
log("Resulting crop with width", width, "and height", height);
croppedCanvas.getContext("2d").drawImage(canvas, Math.max(0, bounds.left), Math.max(0, bounds.top), width, height, 0, 0, width, height);
croppedCanvas.getContext("2d").drawImage(canvas, left, top, width, height, 0, 0, width, height);
return croppedCanvas;
}