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HTML5 Canvas Zoom and Pan Image

Pure JavaScript Zoom and Pan, taken from http://phrogz.net/tmp/canvas_zoom_to_cursor.html

A Pen by TechSlides on CodePen.

License.

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var LightenColor = function(color, percent) {
  	var num = parseInt(color,16),
		amt = Math.round(2.55 * percent),
		R = (num >> 16) + amt,
		B = (num >> 8 & 0x00FF) + amt,
		G = (num & 0x0000FF) + amt;

		return (0x1000000 + (R<255?R<1?0:R:255)*0x10000 + (B<255?B<1?0:B:255)*0x100 + (G<255?G<1?0:G:255)).toString(16).slice(1);
};

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/*
# Convert binary encoded object SID to a string 
# (eg. S-1-5-21-1004336348-1177238915-682003330-512)
#
# SID format: https://technet.microsoft.com/en-us/library/cc962011.aspx 
#
# ldapjs `searchEntry` has attribute `raw` that holds the raw
# values, including the `objectSid` buffer when one exists. Pass that
# buffer to get the string representation that can then be easily
# used in LDAP search filters, for example.

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/**
 * ECMA2015
 */
function convertHex(hexCode,opacity){
    var hex = hexCode.replace('#','');

    if (hex.length === 3) {
        hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
    }

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right_of(X, Y) :- X is Y+1.
left_of(X, Y) :- right_of(Y, X).

next_to(X, Y) :- right_of(X, Y).
next_to(X, Y) :- left_of(X, Y).

solution(Street, FishOwner) :-
    Street = [
           house(1, Nationality1,  Color1,     Pet1,   Drinks1,    Smokes1),
           house(2, Nationality2,  Color2,     Pet2,   Drinks2,    Smokes2),