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436 lines
9.8 KiB
436 lines
9.8 KiB
////////////////////////////////////////////////////////////////////////////////
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// This modules handles the options for Graph3d.
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//
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////////////////////////////////////////////////////////////////////////////////
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var Camera = require('./Camera');
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var Point3d = require('./Point3d');
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// enumerate the available styles
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var STYLE = {
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BAR : 0,
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BARCOLOR: 1,
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BARSIZE : 2,
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DOT : 3,
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DOTLINE : 4,
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DOTCOLOR: 5,
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DOTSIZE : 6,
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GRID : 7,
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LINE : 8,
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SURFACE : 9
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};
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// The string representations of the styles
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var STYLENAME = {
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'dot' : STYLE.DOT,
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'dot-line' : STYLE.DOTLINE,
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'dot-color': STYLE.DOTCOLOR,
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'dot-size' : STYLE.DOTSIZE,
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'line' : STYLE.LINE,
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'grid' : STYLE.GRID,
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'surface' : STYLE.SURFACE,
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'bar' : STYLE.BAR,
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'bar-color': STYLE.BARCOLOR,
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'bar-size' : STYLE.BARSIZE
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};
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/**
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* Field names in the options hash which are of relevance to the user.
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*
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* Specifically, these are the fields which require no special handling,
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* and can be directly copied over.
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*/
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var OPTIONKEYS = [
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'width',
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'height',
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'filterLabel',
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'legendLabel',
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'xLabel',
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'yLabel',
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'zLabel',
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'xValueLabel',
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'yValueLabel',
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'zValueLabel',
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'showGrid',
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'showPerspective',
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'showShadow',
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'keepAspectRatio',
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'verticalRatio',
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'showAnimationControls',
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'animationInterval',
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'animationPreload',
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'animationAutoStart',
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'axisColor',
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'gridColor',
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'xCenter',
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'yCenter'
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];
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/**
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* Field names in the options hash which are of relevance to the user.
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*
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* Same as OPTIONKEYS, but internally these fields are stored with
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* prefix 'default' in the name.
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*/
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var PREFIXEDOPTIONKEYS = [
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'xBarWidth',
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'yBarWidth',
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'valueMin',
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'valueMax',
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'xMin',
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'xMax',
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'xStep',
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'yMin',
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'yMax',
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'yStep',
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'zMin',
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'zMax',
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'zStep'
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];
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// Placeholder for DEFAULTS reference
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var DEFAULTS = undefined;
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/**
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* Check if given hash is empty.
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*
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* Source: http://stackoverflow.com/a/679937
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*/
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function isEmpty(obj) {
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for(var prop in obj) {
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if (obj.hasOwnProperty(prop))
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return false;
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}
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return true;
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}
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/**
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* Make first letter of parameter upper case.
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*
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* Source: http://stackoverflow.com/a/1026087
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*/
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function capitalize(str) {
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if (str === undefined || str === "") {
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return str;
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}
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return str.charAt(0).toUpperCase() + str.slice(1);
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}
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/**
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* Add a prefix to a field name, taking style guide into account
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*/
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function prefixFieldName(prefix, fieldName) {
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if (prefix === undefined || prefix === "") {
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return fieldName;
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}
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return prefix + capitalize(fieldName);
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}
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/**
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* Forcibly copy fields from src to dst in a controlled manner.
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*
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* A given field in dst will always be overwitten. If this field
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* is undefined or not present in src, the field in dst will
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* be explicitly set to undefined.
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*
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* The intention here is to be able to reset all option fields.
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*
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* Only the fields mentioned in array 'fields' will be handled.
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*
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* @param fields array with names of fields to copy
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* @param prefix optional; prefix to use for the target fields.
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*/
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function forceCopy(src, dst, fields, prefix) {
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var srcKey;
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var dstKey;
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for (var i in fields) {
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srcKey = fields[i];
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dstKey = prefixFieldName(prefix, srcKey);
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dst[dstKey] = src[srcKey];
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}
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}
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/**
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* Copy fields from src to dst in a safe and controlled manner.
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*
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* Only the fields mentioned in array 'fields' will be copied over,
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* and only if these are actually defined.
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*
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* @param fields array with names of fields to copy
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* @param prefix optional; prefix to use for the target fields.
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*/
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function safeCopy(src, dst, fields, prefix) {
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var srcKey;
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var dstKey;
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for (var i in fields) {
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srcKey = fields[i];
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if (src[srcKey] === undefined) continue;
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dstKey = prefixFieldName(prefix, srcKey);
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dst[dstKey] = src[srcKey];
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}
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}
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/**
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* Initialize dst with the values in src.
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*
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* src is the hash with the default values.
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* A reference DEFAULTS to this hash is stored locally for
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* further handling.
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*
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* For now, dst is assumed to be a Graph3d instance.
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*/
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function setDefaults(src, dst) {
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if (src === undefined || isEmpty(src)) {
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throw new Error('No DEFAULTS passed');
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}
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if (dst === undefined) {
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throw new Error('No dst passed');
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}
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// Remember defaults for future reference
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DEFAULTS = src;
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// Handle the defaults which can be simply copied over
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forceCopy(src, dst, OPTIONKEYS);
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forceCopy(src, dst, PREFIXEDOPTIONKEYS, 'default');
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// Handle the more complex ('special') fields
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setSpecialSettings(src, dst);
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// Following are internal fields, not part of the user settings
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dst.margin = 10; // px
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dst.showGrayBottom = false; // TODO: this does not work correctly
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dst.showTooltip = false;
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dst.dotSizeRatio = 0.02; // size of the dots as a fraction of the graph width
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dst.eye = new Point3d(0, 0, -1); // TODO: set eye.z about 3/4 of the width of the window?
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}
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function setOptions(options, dst) {
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if (options === undefined) {
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return;
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}
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if (dst === undefined) {
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throw new Error('No dst passed');
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}
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if (DEFAULTS === undefined || isEmpty(DEFAULTS)) {
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throw new Error('DEFAULTS not set for module Settings');
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}
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// Handle the parameters which can be simply copied over
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safeCopy(options, dst, OPTIONKEYS);
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safeCopy(options, dst, PREFIXEDOPTIONKEYS, 'default');
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// Handle the more complex ('special') fields
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setSpecialSettings(options, dst);
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}
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/**
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* Special handling for certain parameters
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*
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* 'Special' here means: setting requires more than a simple copy
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*/
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function setSpecialSettings(src, dst) {
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if (src.backgroundColor !== undefined) {
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setBackgroundColor(src.backgroundColor, dst);
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}
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setDataColor(src.dataColor, dst);
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setStyle(src.style, dst);
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setShowLegend(src.showLegend, dst);
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setCameraPosition(src.cameraPosition, dst);
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// As special fields go, this is an easy one; just a translation of the name.
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// Can't use this.tooltip directly, because that field exists internally
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if (src.tooltip !== undefined) {
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dst.showTooltip = src.tooltip;
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}
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}
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/**
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* Set the value of setting 'showLegend'
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*
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* This depends on the value of the style fields, so it must be called
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* after the style field has been initialized.
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*/
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function setShowLegend(showLegend, dst) {
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if (showLegend === undefined) {
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// If the default was auto, make a choice for this field
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var isAutoByDefault = (DEFAULTS.showLegend === undefined);
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if (isAutoByDefault) {
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// these styles default to having legends
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var isLegendGraphStyle = dst.style === STYLE.DOTCOLOR
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|| dst.style === STYLE.DOTSIZE;
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dst.showLegend = isLegendGraphStyle;
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} else {
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// Leave current value as is
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}
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} else {
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dst.showLegend = showLegend;
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}
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}
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/**
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* Retrieve the style index from given styleName
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* @param {string} styleName Style name such as 'dot', 'grid', 'dot-line'
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* @return {Number} styleNumber Enumeration value representing the style, or -1
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* when not found
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*/
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function getStyleNumberByName(styleName) {
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var number = STYLENAME[styleName];
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if (number === undefined) {
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return -1;
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}
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return number;
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}
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/**
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* Check if given number is a valid style number.
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*
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* @return true if valid, false otherwise
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*/
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function checkStyleNumber(style) {
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var valid = false;
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for (var n in STYLE) {
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if (STYLE[n] === style) {
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valid = true;
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break;
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}
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}
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return valid;
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}
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function setStyle(style, dst) {
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if (style === undefined) {
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return; // Nothing to do
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}
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var styleNumber;
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if (typeof style === 'string') {
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styleNumber = getStyleNumberByName(style);
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if (styleNumber === -1 ) {
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throw new Error('Style \'' + style + '\' is invalid');
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}
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} else {
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// Do a pedantic check on style number value
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if (!checkStyleNumber(style)) {
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throw new Error('Style \'' + style + '\' is invalid');
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}
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styleNumber = style;
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}
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dst.style = styleNumber;
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}
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/**
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* Set the background styling for the graph
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* @param {string | {fill: string, stroke: string, strokeWidth: string}} backgroundColor
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*/
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function setBackgroundColor(backgroundColor, dst) {
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var fill = 'white';
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var stroke = 'gray';
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var strokeWidth = 1;
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if (typeof(backgroundColor) === 'string') {
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fill = backgroundColor;
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stroke = 'none';
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strokeWidth = 0;
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}
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else if (typeof(backgroundColor) === 'object') {
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if (backgroundColor.fill !== undefined) fill = backgroundColor.fill;
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if (backgroundColor.stroke !== undefined) stroke = backgroundColor.stroke;
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if (backgroundColor.strokeWidth !== undefined) strokeWidth = backgroundColor.strokeWidth;
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}
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else {
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throw new Error('Unsupported type of backgroundColor');
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}
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dst.frame.style.backgroundColor = fill;
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dst.frame.style.borderColor = stroke;
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dst.frame.style.borderWidth = strokeWidth + 'px';
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dst.frame.style.borderStyle = 'solid';
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}
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function setDataColor(dataColor, dst) {
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if (dataColor === undefined) {
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return; // Nothing to do
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}
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if (dst.dataColor === undefined) {
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dst.dataColor = {};
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}
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if (typeof dataColor === 'string') {
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dst.dataColor.fill = dataColor;
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dst.dataColor.stroke = dataColor;
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}
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else {
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if (dataColor.fill) {
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dst.dataColor.fill = dataColor.fill;
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}
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if (dataColor.stroke) {
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dst.dataColor.stroke = dataColor.stroke;
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}
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if (dataColor.strokeWidth !== undefined) {
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dst.dataColor.strokeWidth = dataColor.strokeWidth;
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}
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}
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}
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function setCameraPosition(cameraPosition, dst) {
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var camPos = cameraPosition;
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if (camPos === undefined) {
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return;
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}
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if (dst.camera === undefined) {
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dst.camera = new Camera();
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}
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dst.camera.setArmRotation(camPos.horizontal, camPos.vertical);
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dst.camera.setArmLength(camPos.distance);
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}
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module.exports.STYLE = STYLE;
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module.exports.setDefaults = setDefaults;
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module.exports.setOptions = setOptions;
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module.exports.setCameraPosition = setCameraPosition;
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