One of my current projects has a requirement to make the color of the column chart a gradient. I know how to change the color of the column chart, but I don't know if the color value can be like the background. Can I use the gradient?
Thanks
There is an overlay option with which you can set a predefined gradient overlay:
https://www.telerik.com/kendo-angular-ui/components/charts/api/Overlay/
It should also be possible to add any gradient with a custom visual:
public visual(e: any): any {
const visual = e.createVisual();
const color = e.options.color;
const gradient = new LinearGradient({
start: [0, 0.5],
end: [1, 0.5],
stops: [{
offset: 0.2,
color: color,
opacity: 0.5
}, {
offset: 0.5,
color: color,
opacity: 0.3
}, {
offset: 1,
color: color,
opacity: 0.1
}]
});
visual.children[0].fill(gradient);
return visual;
}
https://plnkr.co/edit/AFcM2Q9HAtNs1MhwWFu7?p=preview
Related
The last line of the following code (brutally copied from a HighCharts demo chart page) changes the opacity of a arearange series:
var chart=Highcharts.chart('container', {
series: [{
name: 'Temperature',
data: averages,
zIndex: 1,
marker: {
fillColor: 'white',
lineWidth: 2,
lineColor: Highcharts.getOptions().colors[0]
}
}, {
name: 'Range',
data: ranges,
type: 'arearange',
lineWidth: 0,
linkedTo: ':previous',
color: Highcharts.getOptions().colors[0],
fillOpacity: 0.3,
zIndex: 0,
marker: {
enabled: false
}
}]
});
chart.series[1].update({fillOpacity:0.7},true);
JSFiddle here.
(the opacity could be set directly inside the chart object, but I need to modify it after the chart creation, the code is a toy example to simulate my needs)
My real chart has several arearange series, and updating them is heavy. Is there a way to modify such property avoiding the .update method? that it, is there a way to directly access the svg element corresponding to the arearange series?
I've tried to check the series .graph property, as previously suggested in an answer to a similar question, but in this case arearange series has no .graph property.
It can be done exactly the same as in the answer mentioned in your question but instead of modifying the graph you have to modify the area property.
Code:
chart.series[1].area.attr({
fill: 'rgba(124,181,236,0.7)'
});
Demo:
https://jsfiddle.net/BlackLabel/abohcq4x/
My gpx file already contains elevation information for each trkpt and I can augment this with a speed for each trkpt. I would like to represent the elevation or the speed at each trkpt by varying the color of the track. For instance: slow is blue, fast is red.
How can I do this?
And this probably means: Which files and functions in Openlayers do I have to change to do this?
You can try the ol/style/FlowLine of ol-ext to achieve this.
Using this style, you can change the with/color of the feature along the line using a function. This example show how to: http://viglino.github.io/ol-ext/examples/style/map.style.flowline2.html.
You just have to calculate the width (or color) along the feature geometry varying according the speed or altitude:
const flowStyle = new ol.style.FlowLine({
width: function(f, step) {
// calculate the with of the feature f at the given step
// step is the curvilinear abscissa between 0,1
// (0: first coordinate, 1: last one)
const width = ...
return width;
}
});
#+
You should go with a stylefunction for the vector layer:
https://openlayers.org/en/v4.6.5/apidoc/ol.html#.StyleFunction
This function is checked for each feature to be displayed on the vector layer and the related style can be set/returned programmatically. For example:
function gpxStyle(feature) {
var style = null;
if (feature.get("speed")>="100") {
style = new ol.style.Style({
image: new ol.style.Circle({
radius: 6,
stroke: new ol.style.Stroke({
color: 'red',
width: 2
}),
fill: new ol.style.Fill({
color: 'red'
})
})
});
}
else {
style = new ol.style.Style({
image: new ol.style.Circle({
radius: 6,
stroke: new ol.style.Stroke({
color: 'blue',
width: 2
}),
fill: new ol.style.Fill({
color: 'blue'
})
})
});
}
return [style];
}
var gpxLayer = new ol.layer.Vector({
source: new ol.source.Vector(),
style: gpxStyle
});
I'm using a color picker to choose the color of an object to draw it with Leaflet.Draw but cannot find where.
$("#txtAPColor").on('change', function(){
colorSelectPoi=$("#txtAPColor").value;
});
var circle_options = {
stroke: true,
color: colorSelectPoi,
weight: 4,
opacity: 0.5,
fill: true,
fillColor: null, //same as color by default
fillOpacity: 0.2,
clickable: true
};
new L.Draw.Circle(map, circle_options).enable();
I have solved the problem with the following code:
var optionColorSelected = '#000'
map.on(L.Draw.Event.CREATED, function (event) {
event.layer.options.color = optionColorSelected;
var layer = event.layer;
drawnItems.addLayer(layer);
});
You just have to update the variable optionColorSelected with the color you choose.
I hope I can help you.
Imagine I have Rect element and I wish to decorate it with a small (say 16x16) PNG image in the upper left. I am unable to determine how to achieve that task. I have studied the docs but have (so far) been unable to find a sample or reference on how to achieve that task. Does anyone have a recipe or a sample pointer that they would be willing to share to help me achieve my goal?
Better is to create your own custom shape that has a rectangle, image and text. This gives you much more flexibility and you don't have to have two elements in order to express one shape. Your shape decorated with a little image in the top left corner may look like:
joint.shapes.basic.DecoratedRect = joint.shapes.basic.Generic.extend({
markup: '<g class="rotatable"><g class="scalable"><rect/></g><image/><text/></g>',
defaults: joint.util.deepSupplement({
type: 'basic.DecoratedRect',
size: { width: 100, height: 60 },
attrs: {
'rect': { fill: '#FFFFFF', stroke: 'black', width: 100, height: 60 },
'text': { 'font-size': 14, text: '', 'ref-x': .5, 'ref-y': .5, ref: 'rect', 'y-alignment': 'middle', 'x-alignment': 'middle', fill: 'black' },
'image': { 'ref-x': 2, 'ref-y': 2, ref: 'rect', width: 16, height: 16 }
}
}, joint.shapes.basic.Generic.prototype.defaults)
});
And you can use it like this in your diagrams:
var decoratedRect = new joint.shapes.basic.DecoratedRect({
position: { x: 150, y: 80 },
size: { width: 100, height: 60 },
attrs: {
text: { text: 'My Element' },
image: { 'xlink:href': 'http://placehold.it/16x16' }
}
});
graph.addCell(decoratedRect);
Note how is the shape specified, the important bits are the markup, type and the attrs object that references the SVG elements in the markup by normal CSS selectors (here just tag selectors but you can use classes if you want). For the image tag, we take advantage of the JointJS special attributes for relative positioning (ref, ref-x and ref-y). With these attributes, we position the image relatively to the top left corner of the rect element and we offset it by 2px from the top edge (ref-y) and 2px from the left edge (ref-x).
One note: It is important that the type attribute ('basic.DecoratedRect') matches the namespace the shape is defined in (joint.shapes.basic.DecoratedRect). This is because when JointJS re-constructs graphs from JSON, it looks at the type attribute and makes a simple lookup to the joint.shapes namespace to see if there is a shape defined for this type.
We can create an element type for an image using the following recipe:
var image = new joint.shapes.basic.Image({
position : {
x : 100,
y : 100
},
size : {
width : 16,
height : 16
},
attrs : {
image : {
"xlink:href" : "images/myImage.png",
width : 16,
height : 16
}
}
});
graph.addCell(image);
This will position the image at x=100,y=100. It is important to make the size width/height match the attrs/image width/height and be the width/height of the image itself.
Although this doesn't decorate a previous element, it can be positioned over a previous element achieving the desired effect.
I use Ext.daw.* to draw svg text. The root element has size 200x300.
If some element has larger size than size of root element then everything scales properly except the text: text appears to have larger size.
Check out this demo. How to make text scale properly?
Ext.create('Ext.draw.Component', {
renderTo: Ext.getBody(),
width: 200,
height: 300,
items: [{
type: 'path',
path: 'M0 0 V200',
'stroke-width': 3,
stroke: 'green'
},{
type: 'path',
// if I set path to 'M200 0 V700' then text goes crazy
path: 'M200 0 V200',
'stroke-width': 3,
stroke: 'green'
},{
type: 'text',
x: 0,
y: 50,
// text is located accurately between two lines
// but when one of the lines exceeds size of the canvas
// text's size changes
text: 'wwwwwwwwwwwwwwwwwww',
font: "18px monospace"
}]
});
Text is subject to hinting and kerning that happen differently at different point sizes and so does not normally scale uniformly. There is a hint available to indicate you would like this overridden:
text-rendering="geometricPrecision"
Changing your code to
},{
type: 'text',
x: 0,
y: 50,
text: 'wwwwwwwwwwwwwwwwwww',
'text-rendering': 'geometricPrecision',
font: "17px monospace"
}]
Should make it work more like you want it too, although it will display less clearly at small point sizes.