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Get bounding box off all objects on a fabric canvas
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getBoardBoundingBox: function(canvas) { | |
var minX = Number.MAX_VALUE; | |
var maxX = Number.MIN_VALUE; | |
var minY = Number.MAX_VALUE; | |
var maxY = Number.MIN_VALUE; | |
canvas.forEachObject(function(o){ | |
var rad = o.angle * Math.PI/180; | |
var w = o.width * o.scaleX; | |
var h = o.height * o.scaleY; | |
// xmax = x * w/2 * |cos(theta)| + h/2 * |sin(theta)| | |
var omaxX = o.left +((w/2) * Math.abs(Math.cos(rad))) + ((h/2) * Math.abs(Math.sin(rad))); | |
var ominX = o.left - (omaxX - o.left); | |
// ymax = y * w/2 * |sin(theta)| + h/2 * |cos(theta)| | |
var omaxY = o.top + ((w/2) * Math.abs(Math.sin(rad))) + ((h/2) * Math.abs(Math.cos(rad))); | |
var ominY = o.top - (omaxY - o.top); | |
if (ominX < minX) | |
minX = ominX; | |
if (omaxX > maxX) | |
maxX = omaxX; | |
if (ominY < minY) | |
minY = ominY; | |
if (omaxY > maxY) | |
maxY = omaxY; | |
}); | |
var box = { | |
"x": minX, | |
"y": minY, | |
"w": maxX - minX, | |
"h": maxY - minY | |
}; | |
return box; | |
} | |
}); |
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