You are reading the article Fabricjs � � How To Set Polygon Objects Properties Using Function Instead Of Constructor updated in November 2023 on the website Hatcungthantuong.com. We hope that the information we have shared is helpful to you. If you find the content interesting and meaningful, please share it with your friends and continue to follow and support us for the latest updates. Suggested December 2023 Fabricjs � � How To Set Polygon Objects Properties Using Function Instead Of Constructor
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc.
Syntax Parameters
key − This parameter accepts an String which specifies the property we want to set.
value − This parameter accepts the value to be set for the property.
Example 1: Creating an Instance of fabric.Polygon() and Adding it to our CanvasLet’s see a code example of how we can create a polygon by creating an instance of fabric.Polygon. It can be seen that we have added the properties of “top” and “left” by using the constructor.
Creating an instance of fabric.Polygon() and adding it to our canvas
var canvas = new fabric.Canvas(“canvas”); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250);
var polygon = new fabric.Polygon( [ { x: -20, y: -35 }, { x: 20, y: -35 }, { x: 40, y: 0 }, { x: 20, y: 35 }, { x: -20, y: 35 }, { x: -40, y: 0 }, ], { top: 50, left: 50, } );
canvas.add(polygon); Example 2: Using a Function to Set the Properties of Polygon Object
Let’s see a code example to see how the Polygon object looks like when a function is used to set the properties. Here we have initialized a function called addProperties which adds properties of “stroke”, “left”, “fill”, “top” and “selectable” using the set method. As we call the function, these properties will be added to the object.
var canvas = new fabric.Canvas(“canvas”); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250);
var polygon = new fabric.Polygon([ { x: -20, y: -35 }, { x: 20, y: -35 }, { x: 40, y: 0 }, { x: 20, y: 35 }, { x: -20, y: 35 }, { x: -40, y: 0 }, ]);
function addProperties(obj) { obj.set(“stroke”, “red”); obj.set(“left”, 100); obj.set(“fill”, “black”); obj.set(“top”, 70); obj.set(“selectable”, true); }
addProperties(polygon);
canvas.add(polygon); Conclusion
In this tutorial, we used two simple examples to demonstrate how to set Polygon objects properties using a function instead of constructor using FabricJS.
You're reading Fabricjs � � How To Set Polygon Objects Properties Using Function Instead Of Constructor
How To Set The Size Of Subscript With Text Using Fabricjs?
In this tutorial, we are going to learn how to set the size of subscript with Text using FabricJS. We can display text on canvas by adding an instance of fabric.Text. Not only does it allow us to move, scale and change the dimensions of the text but it also provides additional functionality like text alignment, text decoration, line height which can be obtained by the properties textAlign, underline and lineHeight respectively. We can also use the subscript property where we can specify its size.
Syntax new fabric.Text(text: String , { subscript : {“size”: Number, "baseline": Number}: Object }: Object) Parameters
text − This parameter accepts a String which is the text string that we want to display.
options (optional) − This parameter is an Object which provides additional customizations to our text. Using this parameter colour, cursor, border width and a lot of other properties can be changed related to the object of which subscript is a property.
Options Keys
subscript − This property accepts an Object as value. Inside this object we can specify the size and baseline of our subscript text. The size determines how small our subscript will be whereas the baseline value determines how further below our subscript will be placed. The default values for size (fontSize factor) and baseline (downwards baseline shift factor) are 0.6 and 0.11 respectively.
Example 1Appearance of the Text object when only setSubscript is used
Let’s see a code example to see how our text object looks when only the setSubscript method is used. In this case, our subscript text will have its default size, which is 0.6.
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
width
:
300
,
left
:
50
,
top
:
70
,
fill
:
“green”
,
}
)
;
text
.
setSubscript
(
0
,
4
)
canvas
.
add
(
text
)
;
Example 2Using the setSubscript method with subscript property
In this example, we will see how by using the setSubscript method in conjunction with the subscript property we can manipulate the size of our subscript. Here we have specified the size as 0.3 which makes our subscript text appear smaller than usual.
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
width
:
300
,
left
:
50
,
top
:
70
,
fill
:
“green”
,
subscript
:
{
“size”
:
0.3
}
}
)
;
text
.
setSubscript
(
0
,
4
)
canvas
.
add
(
text
)
;
How To Get The Opacity Of Image Object Using Fabricjs?
In this tutorial, we are going to learn how to get the opacity of Image using FabricJS. We can create an Image object by creating an instance of fabric.Image. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to get the opacity of Image, we use the getObjectOpacity method.
Syntax getObjectOpacity(): Number Using the getObjectOpacity method ExampleLet’s see a code example to see the logged output when the getObjectOpacity method is used. In this case, the default opacity will be displayed in the console which is 1.
You can open console from dev tools and see that the logged value is being displayed
in
the console
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
var
imageElement
=
document
.
getElementById
(
“img1”
)
;
var
image
=
new
fabric
.
Image
(
imageElement
,
{
top
:
50
,
left
:
110
,
}
)
;
canvas
.
add
(
image
)
;
console
.
log
(
“The opacity is: “
,
image
.
getObjectOpacity
(
)
)
;
Using the getObjectOpacity method and passing the opacity property ExampleLet’s see a code example to see the logged output when the getObjectOpacity method is used in conjunction with the opacity property. In this case, the opacity of the image object has been assigned a value of 0.7 and hence the logged output will be 0.7.
You can open console from dev tools and see that the opacity value is being displayed
in
the console
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
var
imageElement
=
document
.
getElementById
(
“img1”
)
;
var
image
=
new
fabric
.
Image
(
imageElement
,
{
top
:
50
,
left
:
110
,
opacity
:
0.7
,
}
)
;
canvas
.
add
(
image
)
;
console
.
log
(
“The opacity is: “
,
image
.
getObjectOpacity
(
)
)
;
How To Check If Polyline Object Intersects With Another Object Using Fabricjs?
We can create a Polyline object by creating an instance of fabric.Polyline. A polyline object can be characterised by a set of connected straight-line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity, etc.
In order to check if a Polyline object intersects with another object, we use the intersectsWithObject method. This method checks whether the object that is passed to it, intersects with the polyline object.
Syntax intersectsWithObject(other: Object, absolute: Boolean, calculate: Boolean ): Boolean Parameters
other − This parameter accepts an Object which specifies the object we want to test.
absolute(optional) − This parameter accepts a String value which specifies whether to use coordinates without viewportTransform or not. This parameter is optional.
calculate(optional) − This parameter accepts a Boolean value which specifies whether to use coordinates of current position. This parameter is optional.
Example 1: Using intersectsWithObject methodLet’s see a code example to see the logged output when the intersectsWithObject method is used. The intersectsWithObject method returns true or false on checking if the polyline object intersects with another object.
Here, we have initialized two rectangle objects namely rectangleRed and rectangleBlue. Since our polyline object intersects with rectangleRed, a true value is returned.
var canvas = new fabric.Canvas(“canvas”); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250);
var polyline = new fabric.Polyline( [ { x: -20, y: -35 }, { x: 20, y: -35 }, { x: 40, y: 0 }, { x: 20, y: 35 }, { x: -20, y: 35 }, { x: -40, y: 0 }, ], { stroke: “red”, left: 100, top: 10, fill: “white”, strokeWidth: 2, strokeLineJoin: “bevil”, } );
var rectangleRed = new fabric.Rect({ width: 60, height: 20, top: 40, left: 80, fill: “red”, strokeWidth: 6, });
var rectangleBlue = new fabric.Rect({ width: 20, height: 40, top: 70, left: 200, fill: “blue”, });
canvas.add(polyline); canvas.add(rectangleRed); canvas.add(rectangleBlue);
console.log( “Does the polyline object intersect with rectangleRed?: “, polyline.intersectsWithObject(rectangleRed) ); console.log( “Does the polyline object intersect with rectangleBlue?: “, polyline.intersectsWithObject(rectangleBlue) );
Example 2: Using intersectsWithObject method with different objectsIn this example, we have used the intersectsWithObject method along with different objects to prove that this method can work with any object.
var canvas = new fabric.Canvas(“canvas”); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250);
var polyline = new fabric.Polyline( [ { x: -20, y: -35 }, { x: 20, y: -35 }, { x: 40, y: 0 }, { x: 20, y: 35 }, { x: -20, y: 35 }, { x: -40, y: 0 }, ], { stroke: “red”, left: 100, top: 10, fill: “white”, strokeWidth: 2, strokeLineJoin: “bevil”, } );
var triangle = new fabric.Triangle({ width: 90, height: 70, top: 40, left: 80, fill: “red”, strokeWidth: 6, });
var circle = new fabric.Circle({ radius: 40, top: 70, left: 200, fill: “blue”, });
canvas.add(polyline); canvas.add(triangle); canvas.add(circle);
console.log( “Does the polyline object intersect with triangle?: “, polyline.intersectsWithObject(triangle) ); console.log( “Does the polyline object intersect with circle?: “, polyline.intersectsWithObject(circle) );
How To Use Cortana Instead Of Google Now On Android
Cortana and Google Now/Google Assistant are battling it out for the wooden spoon of virtual AI assistants. Neither has quite the A-list status of Siri, which by way of being first past the post and, admittedly, being more responsive to your everyday needs, is at the head of the pack.
But Android users can’t have Siri, so we may as well move on. What we can have now is Microsoft’s virtual assistant based on that blue lady in the Halo games, Cortana.
Here’s how to get your hands on it as well as reasons why you’d want it instead of Google Now, Assistant, or whatever they want us to call it these days …
How to Replace the Google App with CortanaTo properly put Cortana through its paces on Android, you should set it as your default voice assistant for a bit just so you can get a feel for it in day-to-day use. To do this, first install the Cortana app from the Play Store.
Once you’ve done that, there are a couple of ways to go about the next bit. The simplest approach, which may not work for everyone, is to long-tap the Home button on your Android device to bring up Google voice search.
If, however, your Home button doesn’t automatically go to your voice assistant, then you should make the Search Assistant the default action when you double-tap (or maybe long-press) your Home button.
Once you’ve done that, double-tap or long-press the Home button and select Cortana as the default search assistant.
How Good Is Cortana vs. Google Now?Cortana on Android still feels like a work in progress, which is fair enough considering Google’s option has been dominating Android devices for years while poor Cortana has had to turn up on Google’s doorstep after the resounding failure of Windows Phone.
Once you’re in Cortana, it has a very similar feel to Google Now, though it won’t be able to draw on your Google search history to get an idea of what kind of stuff you’re interested in. (You’ll need to use Bing for that.)
Cortana’s well integrated with certain Android apps, and if you ask it to send an email, navigate to places, or add something to your calendar, it will generally use the default app for those functions.
However, at this point it’s not quite as robust as Google Assistant, and be prepared for more specific questions to redirect you to Bing’s search results instead of giving you the answer you want straight away.
ConclusionCortana is definitely worth a try if you fancy a change of scene, and it has some interesting features in the pipeline, such as the option to access it directly from your Android lockscreen. It also has several unique features of its own, such as ‘My Day’ which shows you information that it thinks is relevant to planning the day ahead, as well as the abilities to tell you a joke and sing you a song!
Robert Zak
Content Manager at Make Tech Easier. Enjoys Android, Windows, and tinkering with retro console emulation to breaking point.
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How To Force Websites To Use Https Instead Of Insecure Http.
As the Internet slowly but surely starts transitioning from the old and widely used HTTP format to the new HTTPS secured format, you will start to see more and more browsers block access to HTTP websites purely from a security standpoint. So if you still constantly access websites using the less secure HTTP format, this article will show you how to force them to use HTTPS.
How to Block/Hide Cookie and GDPR Warnings Displayed By Websites.
Online security is one of the most important yet difficult areas of life in an always-connected Internet environment. It seems like every day there is a new and emerging threat or vulnerability discovered that threatens to leave us all wide open to some kind of financial or personal information theft.
Although viruses, malware, stalkerware, ransomware, and phishing scams make up most of these threats, accessing and browsing insecure websites that still use the now outdated HTTP format can also leave a person vulnerable. If you are using a modern and up to date browser like Microsoft Edge, Mozilla Firefox, Safari, Google Chrome or Opera, your browser will generally warn you if you are entering a website that isn’t secured by HTTPS. If you’d like to learn a little more about the differences between HTTP and HTTPS I suggest checking out the following Wikipedia page which explains everything in detail.
Can You Force HTTP Websites to Use HTTPS? You Sure Can!Now that you understand the fundamental reasons for the need to switch to HTTPS, you can begin the process of forcing websites to use HTTPS instead of HTTP. To begin you will need to download a small extension called HTTPS Everywhere, which is available for Google Chrome, Mozilla Firefox, and Opera.
HTTPS Everywhere is a collaboration project developed between The Electronic Frontier Foundation and The Tor Project, so before you add the extension to your browser, it’s worth checking out both developer websites for a little more information.
Download HTTPS Everywhere For Opera.
Download HTTPS Everywhere For Firefox.
Download HTTPS Everywhere For Chrome.
Related: How to Securely and Anonymously Share Files of Any Size Using the Tor Network.
If you would rather completely block all HTTP websites, you can tick the Block all unencrypted requests box in the extension. This will prevent all HTTP websites from being displayed, instead showing the following message. Keep in mind that the extension for Google Chrome is still in beta phase so it may be a little overprotective or buggy at times.
Related: How to Send Self Destructing Emails From Gmail. (Time Erased Emails)
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