jvm.NumericScale = function(scale, normalizeFunction, minValue, maxValue) {
this.scale = [];
normalizeFunction = normalizeFunction || 'linear';
if (scale) this.setScale(scale);
if (normalizeFunction) this.setNormalizeFunction(normalizeFunction);
if (typeof minValue !== 'undefined' ) this.setMin(minValue);
if (typeof maxValue !== 'undefined' ) this.setMax(maxValue);
};
jvm.NumericScale.prototype = {
setMin: function(min) {
this.clearMinValue = min;
if (typeof this.normalize === 'function') {
this.minValue = this.normalize(min);
} else {
this.minValue = min;
}
},
setMax: function(max) {
this.clearMaxValue = max;
if (typeof this.normalize === 'function') {
this.maxValue = this.normalize(max);
} else {
this.maxValue = max;
}
},
setScale: function(scale) {
var i;
this.scale = [];
for (i = 0; i < scale.length; i++) {
this.scale[i] = [scale[i]];
}
},
setNormalizeFunction: function(f) {
if (f === 'polynomial') {
this.normalize = function(value) {
return Math.pow(value, 0.2);
}
} else if (f === 'linear') {
delete this.normalize;
} else {
this.normalize = f;
}
this.setMin(this.clearMinValue);
this.setMax(this.clearMaxValue);
},
getValue: function(value) {
var lengthes = [],
fullLength = 0,
l,
i = 0,
c;
if (typeof this.normalize === 'function') {
value = this.normalize(value);
}
for (i = 0; i < this.scale.length-1; i++) {
l = this.vectorLength(this.vectorSubtract(this.scale[i+1], this.scale[i]));
lengthes.push(l);
fullLength += l;
}
c = (this.maxValue - this.minValue) / fullLength;
for (i=0; i= 0) {
value -= lengthes[i];
i++;
}
if (i == this.scale.length - 1) {
value = this.vectorToNum(this.scale[i])
} else {
value = (
this.vectorToNum(
this.vectorAdd(this.scale[i],
this.vectorMult(
this.vectorSubtract(this.scale[i+1], this.scale[i]),
(value) / (lengthes[i])
)
)
)
);
}
return value;
},
vectorToNum: function(vector) {
var num = 0,
i;
for (i = 0; i < vector.length; i++) {
num += Math.round(vector[i])*Math.pow(256, vector.length-i-1);
}
return num;
},
vectorSubtract: function(vector1, vector2) {
var vector = [],
i;
for (i = 0; i < vector1.length; i++) {
vector[i] = vector1[i] - vector2[i];
}
return vector;
},
vectorAdd: function(vector1, vector2) {
var vector = [],
i;
for (i = 0; i < vector1.length; i++) {
vector[i] = vector1[i] + vector2[i];
}
return vector;
},
vectorMult: function(vector, num) {
var result = [],
i;
for (i = 0; i < vector.length; i++) {
result[i] = vector[i] * num;
}
return result;
},
vectorLength: function(vector) {
var result = 0,
i;
for (i = 0; i < vector.length; i++) {
result += vector[i] * vector[i];
}
return Math.sqrt(result);
},
/* Derived from d3 implementation https://github.com/mbostock/d3/blob/master/src/scale/linear.js#L94 */
getTicks: function(){
var m = 5,
extent = [this.clearMinValue, this.clearMaxValue],
span = extent[1] - extent[0],
step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
err = m / span * step,
ticks = [],
tick,
v;
if (err <= .15) step *= 10;
else if (err <= .35) step *= 5;
else if (err <= .75) step *= 2;
extent[0] = Math.floor(extent[0] / step) * step;
extent[1] = Math.ceil(extent[1] / step) * step;
tick = extent[0];
while (tick <= extent[1]) {
if (tick == extent[0]) {
v = this.clearMinValue;
} else if (tick == extent[1]) {
v = this.clearMaxValue;
} else {
v = tick;
}
ticks.push({
label: tick,
value: this.getValue(v)
});
tick += step;
}
return ticks;
}
};