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233 lines
6.8 KiB
233 lines
6.8 KiB
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function DataScale(start, end, autoScaleStart, autoScaleEnd, containerHeight, majorCharHeight, zeroAlign = false, formattingFunction=false) {
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this.majorSteps = [1, 2, 5, 10];
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this.minorSteps = [0.25, 0.5, 1, 2];
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this.customLines = null;
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this.containerHeight = containerHeight;
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this.majorCharHeight = majorCharHeight;
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this._start = start;
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this._end = end;
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this.scale = 1;
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this.minorStepIdx = -1;
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this.magnitudefactor = 1;
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this.determineScale();
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this.zeroAlign = zeroAlign;
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this.autoScaleStart = autoScaleStart;
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this.autoScaleEnd = autoScaleEnd;
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this.formattingFunction = formattingFunction;
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if (autoScaleStart || autoScaleEnd) {
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var me = this;
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var roundToMinor = function (value) {
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var rounded = value - (value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]));
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if (value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]) > 0.5 * (me.magnitudefactor * me.minorSteps[me.minorStepIdx])) {
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return rounded + (me.magnitudefactor * me.minorSteps[me.minorStepIdx]);
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}
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else {
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return rounded;
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}
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};
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if (autoScaleStart) {
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this._start -= this.magnitudefactor * 2 * this.minorSteps[this.minorStepIdx];
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this._start = roundToMinor(this._start);
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}
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if (autoScaleEnd) {
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this._end += this.magnitudefactor * this.minorSteps[this.minorStepIdx];
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this._end = roundToMinor(this._end);
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}
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this.determineScale();
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}
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}
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DataScale.prototype.setCharHeight = function (majorCharHeight) {
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this.majorCharHeight = majorCharHeight;
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};
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DataScale.prototype.setHeight = function (containerHeight) {
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this.containerHeight = containerHeight;
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};
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DataScale.prototype.determineScale = function () {
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var range = this._end - this._start;
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this.scale = this.containerHeight / range;
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var minimumStepValue = this.majorCharHeight / this.scale;
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var orderOfMagnitude = (range > 0)
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? Math.round(Math.log(range) / Math.LN10)
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: 0;
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this.minorStepIdx = -1;
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this.magnitudefactor = Math.pow(10, orderOfMagnitude);
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var start = 0;
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if (orderOfMagnitude < 0) {
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start = orderOfMagnitude;
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}
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var solutionFound = false;
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for (var l = start; Math.abs(l) <= Math.abs(orderOfMagnitude); l++) {
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this.magnitudefactor = Math.pow(10, l);
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for (var j = 0; j < this.minorSteps.length; j++) {
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var stepSize = this.magnitudefactor * this.minorSteps[j];
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if (stepSize >= minimumStepValue) {
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solutionFound = true;
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this.minorStepIdx = j;
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break;
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}
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}
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if (solutionFound === true) {
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break;
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}
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}
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};
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DataScale.prototype.is_major = function (value) {
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return (value % (this.magnitudefactor * this.majorSteps[this.minorStepIdx]) === 0);
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};
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DataScale.prototype.getStep = function(){
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return this.magnitudefactor * this.minorSteps[this.minorStepIdx];
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};
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DataScale.prototype.getFirstMajor = function(){
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var majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
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return this.convertValue(this._start + ((majorStep - (this._start % majorStep)) % majorStep));
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};
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DataScale.prototype.formatValue = function(current) {
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var returnValue = current.toPrecision(5);
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if (typeof this.formattingFunction === 'function') {
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returnValue = this.formattingFunction(current);
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}
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if (typeof returnValue === 'number') {
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return '' + returnValue;
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}
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else if (typeof returnValue === 'string') {
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return returnValue;
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}
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else {
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return current.toPrecision(5);
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}
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};
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DataScale.prototype.getLines = function () {
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var lines = [];
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var step = this.getStep();
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var bottomOffset = (step - (this._start % step)) % step;
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for (var i = (this._start + bottomOffset); this._end-i > 0.00001; i += step) {
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if (i != this._start) { //Skip the bottom line
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lines.push({major: this.is_major(i), y: this.convertValue(i), val: this.formatValue(i)});
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}
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}
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return lines;
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};
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DataScale.prototype.followScale = function (other) {
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var oldStepIdx = this.minorStepIdx;
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var oldStart = this._start;
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var oldEnd = this._end;
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var me = this;
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var increaseMagnitude = function () {
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me.magnitudefactor *= 2;
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};
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var decreaseMagnitude = function () {
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me.magnitudefactor /= 2;
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};
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if ((other.minorStepIdx <= 1 && this.minorStepIdx <= 1) || (other.minorStepIdx > 1 && this.minorStepIdx > 1)) {
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//easy, no need to change stepIdx nor multiplication factor
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} else if (other.minorStepIdx < this.minorStepIdx) {
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//I'm 5, they are 4 per major.
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this.minorStepIdx = 1;
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if (oldStepIdx == 2) {
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increaseMagnitude();
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} else {
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increaseMagnitude();
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increaseMagnitude();
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}
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} else {
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//I'm 4, they are 5 per major
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this.minorStepIdx = 2;
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if (oldStepIdx == 1) {
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decreaseMagnitude();
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} else {
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decreaseMagnitude();
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decreaseMagnitude();
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}
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}
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//Get masters stats:
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var otherZero = other.convertValue(0);
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var otherStep = other.getStep() * other.scale;
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var done = false;
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var count = 0;
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//Loop until magnitude is correct for given constrains.
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while (!done && count++ <5) {
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//Get my stats:
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this.scale = otherStep / (this.minorSteps[this.minorStepIdx] * this.magnitudefactor);
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var newRange = this.containerHeight / this.scale;
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//For the case the magnitudefactor has changed:
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this._start = oldStart;
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this._end = this._start + newRange;
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var myOriginalZero = this._end * this.scale;
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var majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
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var majorOffset = this.getFirstMajor() - other.getFirstMajor();
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if (this.zeroAlign) {
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var zeroOffset = otherZero - myOriginalZero;
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this._end += (zeroOffset / this.scale);
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this._start = this._end - newRange;
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} else {
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if (!this.autoScaleStart) {
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this._start += majorStep - (majorOffset / this.scale);
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this._end = this._start + newRange;
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} else {
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this._start -= majorOffset / this.scale;
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this._end = this._start + newRange;
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}
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}
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if (!this.autoScaleEnd && this._end > oldEnd+0.00001) {
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//Need to decrease magnitude to prevent scale overshoot! (end)
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decreaseMagnitude();
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done = false;
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continue;
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}
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if (!this.autoScaleStart && this._start < oldStart-0.00001) {
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if (this.zeroAlign && oldStart >= 0) {
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console.warn("Can't adhere to given 'min' range, due to zeroalign");
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} else {
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//Need to decrease magnitude to prevent scale overshoot! (start)
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decreaseMagnitude();
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done = false;
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continue;
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}
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}
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if (this.autoScaleStart && this.autoScaleEnd && newRange < (oldEnd-oldStart)){
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increaseMagnitude();
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done = false;
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continue;
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}
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done = true;
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}
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};
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DataScale.prototype.convertValue = function (value) {
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return this.containerHeight - ((value - this._start) * this.scale);
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};
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DataScale.prototype.screenToValue = function (pixels) {
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return ((this.containerHeight - pixels) / this.scale) + this._start;
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};
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module.exports = DataScale;
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