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px-vis-gridlines.html
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px-vis-gridlines.html
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<!--
Copyright (c) 2018, General Electric
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<link rel="import" href="../polymer/polymer.html"/>
<link rel="import" href="px-vis-behavior-common.html" />
<link rel="import" href="px-vis-behavior-d3.html" />
<link rel="import" href="css/px-vis-styles.html">
<!--
The drawing object has two orientation options: `bottom` and `left`.
Using `bottom` specifies vertical gridlines drawn from the x-axis.
Using `left` specifes horizontal gridlines drawn from the y-axis.
### Usage
<px-vis-gridlines
svg="[[svg]]"
axis="[[x]]"
margin="[[margin]]"
length="[[height]]"
orientation="bottom">
</px-vis-gridlines>
### d3 reference
https://github.com/mbostock/d3/wiki/SVG-Axes
The gridlines still make use of the d3.axis object, just with different settings
### Styling
The following custom properties are available for styling:
Custom property | Description
:----------------|:-------------
`--px-vis-gridlines-color` | The color for the gridlines
@element px-vis-gridlines
@blurb Drawing object which adds gridlines to the chart.
@homepage index.html
@demo demo.html
-->
<dom-module id="px-vis-gridlines">
<template>
<style include="px-vis-styles"></style>
</template>
</dom-module>
<script>
Polymer({
is: 'px-vis-gridlines',
behaviors: [
PxVisBehavior.observerCheck,
PxVisBehaviorD3.svg,
PxVisBehavior.sizing,
PxVisBehavior.commonMethods,
PxVisBehaviorD3.axis,
PxVisBehaviorD3.axisConfig,
PxVisBehaviorD3.domainUpdate,
PxVisBehavior.updateStylesOverride
],
/**
* Properties block, expose attribute values to the DOM via 'reflect'
*
* @property properties
* @type Object
*/
properties: {
/**
* Holder for the instantiated d3 grid.
*
* @property _grid
* @type Object
*/
_grid: {
type: Object,
notify: true
},
/**
* Holder for the grid drawing.
*
* @property _gridGroup
* @type Object
*/
_gridGroup: {
type: Object,
value: function() { return{}; }
},
/**
* A unique ID for the grid.
*
* @property gridId
* @type String
* @default random string
*/
gridId: {
type:String,
value: ''
},
/**
* An x,y amount to move the grid to allow for labels and titles.
*
* @property _translateAmt
* @type Array
*/
_translateAmt: {
type: Array,
value:function() { return [0,0]; }
},
/**
* Boolean to control if the grid should be drawn.
*
*/
_drawGrid: {
type: Boolean,
value: true
},
_isDirty: {
type: Boolean,
value: false
}
},
observers: [
'drawElement(domainChanged,axis,margin.*,length,svg, offset)',
'_setLineStyles(_stylesUpdated)'
],
ready:function() {
// if there is no dev set unique ID, generate one
if(!this.gridId) {
this.set('gridId', this.generateRandomID('grid_'));
}
},
attached: function() {
this._drawGrid = true;
if(this._isDirty) {
this.drawElement();
this._isDirty = false;
}
},
detached: function() {
if(this._doesObjHaveValues(this._gridGroup)){
this._gridGroup.remove();
this._gridGroup = null;
}
this._drawGrid = false;
this._isDirty = true;
},
/**
* Defines basics of the d3.axis.
*
* @method _drawElement
*/
defineGrid:function() {
switch(this.orientation) {
case 'bottom':
this._grid = Px.d3.axisBottom(this.axis);
break;
case 'top':
this._grid = Px.d3.axisTop(this.axis);
break;
case 'right':
this._grid = Px.d3.axisRight(this.axis);
break;
default: //case 'left':
this._grid = Px.d3.axisLeft(this.axis);
break;
}
if(this.tickValues && this.tickValues.length > 0) {
if(!isNaN(this.axis.domain()[0]) && !isNaN(this.axis.domain()[1])){
this._grid.tickValues(this.tickValues);
}
}
// TODO dev set # of gridlines
// TODO link to number of gridlines the axis has and dev set multiplier (2x)
if(this.orientation === 'bottom') {
this._grid.tickSizeInner(Number(this.margin.top) + Number(this.margin.bottom) - this.length);
} else if(this.orientation === 'left') {
this._grid.tickSizeInner(Number(this.margin.left) + Number(this.margin.right) - this.length);
}
},
/**
* Method fired via observer which draws the gridlines.
*
* @method _drawElement
*/
drawElement: function() {
if(this.hasUndefinedArguments(arguments)) {
return;
}
this.debounce('draw_grid', function() {
if(this._drawGrid && this.axis && this.axis.domain()) {
this.defineGrid();
// this._grid.tickValues(this.axis.domain());
if(this.orientation === 'bottom') {
var h = Px.d3.select(this.svg.node().ownerSVGElement).attr('height') - Number(this.margin.bottom) - Number(this.margin.top);
this._translateAmt = [0,h];
} else if(this.orientation === 'left') {
this._translateAmt = [0,0];
}
// checks to see if the grid already exists. If not, create; if so, update
if(this._isObjEmpty(this._gridGroup)) {
this._gridGroup = this.svg.append('g')
.attr('class', 'grid')
.attr('grid-id',this.gridId)
.attr('transform', 'translate(' + (this._translateAmt[0] + this.offset[0]) + ',' + (this._translateAmt[1] + this.offset[1]) + ')')
.call(this._grid);
this._removeUncessaryElems(this._gridGroup);
this._setLineStyles();
} else {
this._gridGroup
// .duration(750)
.attr('transform', 'translate(' + (this._translateAmt[0] + this.offset[0]) + ',' + (this._translateAmt[1] + this.offset[1]) + ')')
.call(this._grid);
this._removeUncessaryElems(this._gridGroup);
this._setLineStyles();
}
}
},5);
},
/**
* Removes other axis elements which are duplicated with px-vis-axis.
*
* @method _drawElement
*/
_removeUncessaryElems:function(elem) {
elem.selectAll('text').remove();
elem.selectAll('path').remove();
},
/**
* Sets the gridline lines styles.
*
* @method _drawElement
*/
_setLineStyles:function() {
if(this.hasUndefinedArguments(arguments)) {
return;
}
if(this._doesD3HaveValues(this._gridGroup)) {
this._gridGroup.selectAll('line')
.attr('fill','none')
.attr('stroke', this._checkThemeVariable('--px-vis-gridlines-color', 'rgb(125,125,125)'))
.attr('shape-rendering','crispEdges');
}
}
});
</script>