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spectrum.html
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spectrum.html
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<!doctype html>
<html lang="en" ng-app="colour">
<head>
<meta charset="utf-8">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"></script>
<style>
.spectrum .row {
line-height: 0;
}
.spectrum .cell {
width: 30px;
height: 30px;
display: inline-block;
}
</style>
</head>
<body ng-controller="MainController">
<input type="text" ng-model="steps" />
<input type="text" ng-model="startHex" />
<input type="text" ng-model="endHex" />
<input type="text" ng-model="baseHex" />
<div spectrum steps="steps" start-hex="startHex" end-hex="endHex" base-hex="baseHex"></div>
<script>
angular.module('colour', []);
angular.module('colour').directive('spectrum', [function () {
return {
restrict: 'A',
scope: {
steps: '=',
startHex: '=',
endHex: '=',
baseHex: '='
},
replace: true,
template: `
<div class="spectrum">
<div ng-repeat="row in colors track by $index" class="row">
<div ng-repeat="cell in row track by $index" class="cell" style="background-color:{{cell}}">
</div>
</div>
</div>
`,
link: function ($scope, elm, attrs) {
$scope.$watch('steps', function () {
if ($scope.steps > 0) {
$scope.colors = generateColors();
}
});
$scope.$watch('startHex', function () {
if ($scope.startHex.length != 6) return;
$scope.colors = generateColors();
});
$scope.$watch('baseHex', function () {
if ($scope.baseHex.length != 6) return;
$scope.colors = generateColors();
});
$scope.$watch('endHex', function () {
if ($scope.endHex.length != 6) return;
$scope.colors = generateColors();
});
function generateColors () {
var colors = [],
startRgb = hexToRgb($scope.startHex),
endRgb = hexToRgb($scope.endHex),
baseRgb = hexToRgb($scope.baseHex),
row,
j,
i;
var dxr = (startRgb.r - endRgb.r) / ($scope.steps - 1),
dxg = (startRgb.g - endRgb.g) / ($scope.steps - 1),
dxb = (startRgb.b - endRgb.b) / ($scope.steps - 1);
for (j = 0; j < $scope.steps; j++) {
for (i = 0; i < $scope.steps; i++) {
if (i == 0) {
row = [];
}
var dyr = (startRgb.r - (i * dxr) - baseRgb.r) / ($scope.steps - 1),
dyg = (startRgb.g - (i * dxg) - baseRgb.g) / ($scope.steps - 1),
dyb = (startRgb.b - (i * dxb) - baseRgb.b) / ($scope.steps - 1);
var r = Math.round(startRgb.r - (i * dxr) - (j * dyr)),
g = Math.round(startRgb.g - (i * dxg) - (j * dyg)),
b = Math.round(startRgb.b - (i * dxb) - (j * dyb));
row.push(rgbToHex(r, g, b));
}
colors.push(row);
}
return colors;
}
// Sourced from: http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
function componentToHex(c) {
var hex = c.toString(16);
return hex.length == 1 ? '0' + hex : hex;
}
function rgbToHex(r, g, b) {
return '#' + componentToHex(r) + componentToHex(g) + componentToHex(b);
}
function hexToRgb(hex) {
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: parseInt(result[1], 16),
g: parseInt(result[2], 16),
b: parseInt(result[3], 16)
} : null;
}
}
};
}]);
angular.module('colour').controller('MainController', ['$scope', function ($scope) {
$scope.steps = 32;
$scope.startHex = 'ffffff';
$scope.endHex = 'b71234';
$scope.baseHex = '26040c';
}]);
</script>
</body>
</html>