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Some helper functions needed for better scales.

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Evert Timberg 2015-05-16 19:38:31 -04:00
parent fff81c455d
commit b5b0081108
1 changed files with 33 additions and 0 deletions
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33
src/Chart.Core.js
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@ -360,6 +360,9 @@
toRadians = helpers.radians = function(degrees) {
return degrees * (Math.PI / 180);
},
toDegrees = helpers.toDegrees = function(radians) {
return radians * (180 / Math.PI);
},
// Gets the angle from vertical upright to the point about a centre.
getAngleFromPoint = helpers.getAngleFromPoint = function(centrePoint, anglePoint) {
var distanceFromXCenter = anglePoint.x - centrePoint.x,
@ -479,6 +482,36 @@
};
},
// Implementation of the nice number algorithm used in determining where axis labels will go
niceNum = helpers.niceNum = function(range, round) {
var exponent = Math.floor(Math.log10(range));
var fraction = range / Math.pow(10, exponent);
var niceFraction;
if (round) {
if (fraction < 1.5) {
niceFraction = 1;
} else if (fraction < 3) {
niceFraction = 2;
} else if (fraction < 7) {
niceFraction = 5;
} else {
niceFraction = 10;
}
} else {
if (fraction <= 1.0) {
niceFraction = 1;
} else if (fraction <= 2) {
niceFraction = 2;
} else if (fraction <= 5) {
niceFraction = 5;
} else {
niceFraction = 10;
}
}
return niceFraction * Math.pow(10, exponent);
},
/* jshint ignore:start */
// Blows up jshint errors based on the new Function constructor
//Templating methods