I have an issue with OpenLayers (v 6.14.1 from npm) where the text on the text label is rather fuzzy.
See the attached image. Compare the text labels with the text in the dialog to the right.
I create the map with pixelRatio: 1, but that shouldn't affect this (?)
const map = new Map({
target: div,
view: new View({
center: fromLonLat ([startLocation.lon, startLocation.lat]),
zoom: startLocation.zoom,
constrainResolution: true,
}),
pixelRatio: 1, //Important, otherwise tiles (WMS) with strange size will be requested
});
I create the text label thus:
export default function (feature, resolution, options) {
return new Text ({
font: 'Normal 14px serif', // Normal 14px Arial
text: getText (feature, resolution, options),
fill: new Fill ({ color: 'black' }),
stroke: new Stroke ({ color: 'white', width: 2 }),
offsetX: -12,
offsetY: -8,
textAlign: 'right',
textBaseline: 'bottom',
placement: 'point',
});
}
I've already tried other fonts (e.g. a sans-serif).
I did as #Mike suggested - see their comment under the question - here's the result:
I think the labels are now a fair bit sharper. Picture doesn't show this too well tho'.
Related
I'm using version 3.6.6 of fabricJS.
When double clicking on the text, I can no longer change the color of it. This is definitely a bug. Anyone find a workaround for this?
Here's the fiddle:
// Do some initializing stuff
fabric.Object.prototype.set({
transparentCorners: false,
cornerColor: 'rgba(102,153,255,0.5)',
cornerSize: 12,
padding: 5
});
var canvas = window._canvas = new fabric.Canvas('c');
let text = new fabric.IText('Some Selectable Text Here', {
strokeWidth: 0,
stroke: "#ffffff",
paintFirst: "stroke",
fill: '#000000',
fontFamily: 'Courier',
fontSize: 20,
typeOfObject: "text",
charSpacing: 0,
top:25,
left: 25,
});
// Set canvas width / height to one of watermarks boundary dimensions
canvas.setWidth(400);
canvas.setHeight(200);
canvas.backgroundColor = '#efefef';
// Add watermark to new canvas
canvas.add(text);
$('#cc').click( function() {
console.log(text);
text.set("fill", '#CC0000');
canvas.renderAll();
});
https://jsfiddle.net/busatlic/ok3rs0ay/60/
How to encounter the bug:
Double click select a portion of text
Type something to change it
Click "Change Color"
Output after following steps.
Thanks!
Trying to change style after having double clicked it and changed some text.
It should change the color of the whole text, but instead only changes the color of all of the text that was NOT double click selected and edited.
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
});
Is there way to customize padding / position... of the burger button.
In the doc, i just can find the drawerImage parameter to override the burger image...
Saddly no option without forking. You can check the code here:
https://github.com/aksonov/react-native-router-flux/blob/master/src/NavBar.js. Padding and position is fixed.
Actually there's a parameter for it : leftButtonStyle
in my case I use react-native-vector-icons getImageSource for the burger icon
componentWillMount() {
Promise.all([Icon.getImageSource('bars', 16, 'black')])
.then((values) => {
this.setState({
menuIcon: values[0],
});
});
}
then you do something like this:
const menuIcon = {
uri: this.state.menuIcon.uri,
height: 20,
width: 20,
resizeMode: 'stretch',
color: 'white',
};
then in your tabs scene
<Scene
key="main"
type="replace"
initial
drawerImage={menuIcon}
tabs
style={{ backgroundColor: theme.navColor, justifyContent: 'center' }}
>
I am developing a navigation application, which draws planned route on a map. Planned route consists of points connected with a line. Each point is labelled with distance and direction. When I initially draw the route on the map, I calculate text position in a way, where it doesn't interfere with the line - I use offsetX, offsetY and rotation style attributes. Unfortunately, when the map view is rotated, not of the mentioned attributes is changed - text is not rotated. Is there a way, how to rotate the text with the view, so it will remain on it's position relative to the point? I have already tried rotateWithView: true with both image and text parts.
My style is defined like:
return [new ol.style.Style({
image: new ol.style.Circle({
radius: 20,
fill: new ol.style.Fill({color: 'black'}),
stroke: new ol.style.Stroke({color: 'black', width: 1})
}),
text: new ol.style.Text({
textAlign: "center",
textBaseline: "middle",
font: 'normal 1.5rem Arial',
text: "This is my text",
fill: new ol.style.Fill({color: 'black'}),
stroke: new ol.style.Stroke({color: 'black', width: 1}),
offsetX: 10,
offsetY: 15,
rotation: 0.3
})
})];
Update feature rotation on map view property change event.
map.getView().on('propertychange', function(event) {
textStyle.setRotation(this.getRotation());
mySource.changed();
});
var textStyle = new ol.style.Text({
// ...
});
var layer = new ol.layer.Vector({
source: mySource,
style: new ol.style.Style({
text: textStyle,
// ...
})
});
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.