sjy-ecos/public/lib/bokeh/js/tree/models/mappers/log_mapper.js

148 lines
5.2 KiB
JavaScript

var LogMapper, Model, p,
extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
hasProp = {}.hasOwnProperty;
Model = require("../../model");
p = require("../../core/properties");
LogMapper = (function(superClass) {
extend(LogMapper, superClass);
function LogMapper() {
return LogMapper.__super__.constructor.apply(this, arguments);
}
LogMapper.prototype.initialize = function(attrs, options) {
LogMapper.__super__.initialize.call(this, attrs, options);
this.define_computed_property('mapper_state', this._mapper_state, true);
this.add_dependencies('mapper_state', this, ['source_range', 'target_range']);
this.add_dependencies('mapper_state', this.get('source_range'), ['start', 'end']);
return this.add_dependencies('mapper_state', this.get('target_range'), ['start', 'end']);
};
LogMapper.prototype.map_to_target = function(x) {
var inter_offset, inter_scale, intermediate, offset, ref, result, scale;
ref = this.get('mapper_state'), scale = ref[0], offset = ref[1], inter_scale = ref[2], inter_offset = ref[3];
result = 0;
if (inter_scale === 0) {
intermediate = 0;
} else {
intermediate = (Math.log(x) - inter_offset) / inter_scale;
if (isNaN(intermediate) || !isFinite(intermediate)) {
intermediate = 0;
}
}
result = intermediate * scale + offset;
return result;
};
LogMapper.prototype.v_map_to_target = function(xs) {
var idx, inter_offset, inter_scale, intermediate, j, k, len, len1, offset, ref, result, scale, x;
ref = this.get('mapper_state'), scale = ref[0], offset = ref[1], inter_scale = ref[2], inter_offset = ref[3];
result = new Float64Array(xs.length);
if (inter_scale === 0) {
intermediate = xs.map(function(i) {
return 0;
});
} else {
intermediate = xs.map(function(i) {
return (Math.log(i) - inter_offset) / inter_scale;
});
for (idx = j = 0, len = intermediate.length; j < len; idx = ++j) {
x = intermediate[idx];
if (isNaN(intermediate[idx]) || !isFinite(intermediate[idx])) {
intermediate[idx] = 0;
}
}
}
for (idx = k = 0, len1 = xs.length; k < len1; idx = ++k) {
x = xs[idx];
result[idx] = intermediate[idx] * scale + offset;
}
return result;
};
LogMapper.prototype.map_from_target = function(xprime) {
var inter_offset, inter_scale, intermediate, offset, ref, scale;
ref = this.get('mapper_state'), scale = ref[0], offset = ref[1], inter_scale = ref[2], inter_offset = ref[3];
intermediate = (xprime - offset) / scale;
intermediate = Math.exp(inter_scale * intermediate + inter_offset);
return intermediate;
};
LogMapper.prototype.v_map_from_target = function(xprimes) {
var idx, inter_offset, inter_scale, intermediate, j, len, offset, ref, result, scale, x;
result = new Float64Array(xprimes.length);
ref = this.get('mapper_state'), scale = ref[0], offset = ref[1], inter_scale = ref[2], inter_offset = ref[3];
intermediate = xprimes.map(function(i) {
return (i - offset) / scale;
});
for (idx = j = 0, len = xprimes.length; j < len; idx = ++j) {
x = xprimes[idx];
result[idx] = Math.exp(inter_scale * intermediate[idx] + inter_offset);
}
return result;
};
LogMapper.prototype._get_safe_scale = function(orig_start, orig_end) {
var end, log_val, ref, start;
if (orig_start < 0) {
start = 0;
} else {
start = orig_start;
}
if (orig_end < 0) {
end = 0;
} else {
end = orig_end;
}
if (start === end) {
if (start === 0) {
ref = [1, 10], start = ref[0], end = ref[1];
} else {
log_val = Math.log(start) / Math.log(10);
start = Math.pow(10, Math.floor(log_val));
if (Math.ceil(log_val) !== Math.floor(log_val)) {
end = Math.pow(10, Math.ceil(log_val));
} else {
end = Math.pow(10, Math.ceil(log_val) + 1);
}
}
}
return [start, end];
};
LogMapper.prototype._mapper_state = function() {
var end, inter_offset, inter_scale, offset, ref, scale, screen_range, source_end, source_start, start, target_end, target_start;
source_start = this.get('source_range').get('start');
source_end = this.get('source_range').get('end');
target_start = this.get('target_range').get('start');
target_end = this.get('target_range').get('end');
screen_range = target_end - target_start;
ref = this._get_safe_scale(source_start, source_end), start = ref[0], end = ref[1];
if (start === 0) {
inter_scale = Math.log(end);
inter_offset = 0;
} else {
inter_scale = Math.log(end) - Math.log(start);
inter_offset = Math.log(start);
}
scale = screen_range;
offset = target_start;
return [scale, offset, inter_scale, inter_offset];
};
LogMapper.internal({
source_range: [p.Any],
target_range: [p.Any]
});
return LogMapper;
})(Model);
module.exports = {
Model: LogMapper
};