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In this tutorial, we are going to learn how to get the position of Image object with respect to origin 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 position of Image object with respect to origin, we use the getPointByOrigin method.
Syntax getPointByOrigin(originX: String, originY: String): fabric.Point Parameters
originX − This parameter accepts a String which specifies the horizontal origin. The possible values are ‘left’, ‘center’ or ‘right’.
originY − This parameter accepts a String which denotes the vertical origin. The possible values are ‘top’, ‘center’ or ‘bottom’.
Using getPointByOrigin method ExampleLet’s see a code example to see the logged output when the getPointByOrigin method is used. The getPointByOrigin method returns the coordinates of an object for a user specified origin. In this case, we have used the getCenterPoint method as well so that you can see the real center points of the given Image object. Whereas while using the getPointByOrigin method, we have taken the bottom left point as origin and therefore the logged output is x= 110 and y= 132.
You can open console from dev tools and see that the logged output contains the coordinates
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 real center point of the object is: “
,
image
.
getCenterPoint
(
)
)
;
console
.
log
(
“The coordinates returned while using getPointByOrigin method are: “
,
image
.
getPointByOrigin
(
“left”
,
“bottom”
)
)
;
Using getPointByOrigin method with different values ExampleIn this example, we have used the getPointByOrigin method to obtain the coordinates of the Image object when the horizontal and vertical center points are ‘right’ and ‘top’. This means the top-right point will be considered as center.
You can open console from dev tools and see that the logged output contains the coordinates
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 coordinates returned while using getPointByOrigin method are: “
,
image
.
getPointByOrigin
(
“right”
,
“top”
)
)
;
You're reading Fabricjs – How To Get The Position Of Image Object With Respect To Origin?
How To Identify If The Given Object Is Of A Polyline Instance 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 identify if the given object is of a Polyline instance, we use the isType method. This method checks if the object is of the specified type and returns a true or false value depending on that.
Syntax isType(type: String): BooleanHere, type is the parameter that accepts a String which specifies the type we want to check.
Example 1: Using isType MethodLet’s see a code example to see the logged output when the isType method is used. The isType method returns a true or false value depending on whether the type of the instance matches the type that we want to check or not. In this case, a true value is returned since the type matches.
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: 50, fill: “black”, strokeWidth: 2, } );
canvas.add(polyline);
console.log( “Is the specified type identical to a polyline instance? : “, polyline.isType(“polyline”) );
Example 2: Using isType Method with a Different ValueIn this example, we have used the isType to check if the specified circle type is identical to a polyline instance. Here, a false value is returned since they are not identical.
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: 50, fill: “black”, strokeWidth: 2, } );
canvas.add(polyline);
console.log( “Is the specified type identical to a polyline instance? : “, polyline.isType(“circle”) );
How To Lock The Horizontal Movement Of Line Using Fabricjs?
In this tutorial, we are going to learn how to lock the horizontal movement of a Line using FabricJS. A Line element is one of the basic elements provided in FabricJS. It is used for creating straight lines. Because line elements are geometrically one-dimensional and do not contain an interior, they are never filled. We can create a line object by creating an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. We can also specify whether we want the line object to move only in the Y-axis. This can be done by using the lockMovementX property.
Syntax new fabric.Line(points: Array, { lockMovementX: Boolean }: Object) Parameters
points − This parameter accepts an Array of points which determines the (x1, y1) and (x2, y2) values, those being the x- and y-axis coordinates of the start and end of the line respectively.
options (optional) − This parameter is an Object which provides additional customizations to our line object. Using this parameter origin, stroke width and a lot of other properties can be changed related to the object of which lockMovementX is a property.
Options Keys
lockMovementX − This property accepts a Boolean value. If we assign it a ‘true’ value, then the object will no longer be able to move in the horizontal direction.
Default behaviour of a Line object in the canvas ExampleLet’s see a code example to understand how we can move our line object in the X-axis or the Y-axis freely when lockMovementX property is not assigned a ‘true’ value.
Drag the line object across the x
–
axis and y
–
axis to see that movement is allowed
in
both directions
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
var
line
=
new
fabric
.
Line
(
[
200
,
100
,
100
,
40
]
,
{
stroke
:
“blue”
,
strokeWidth
:
20
,
}
)
;
canvas
.
add
(
line
)
;
Passing lockMovementX as key with ‘true’ value ExampleIn this example, we will see how we can lock the horizontal movement of a line object. By assigning the lockMovementX property a ‘true’ value, we essentially cease movement in the horizontal direction.
Drag the line object across the x
–
axis and y
–
axis to see that movement is no longer allowed
in
the horizontal direction
var
canvas
=
new
fabric
.
Canvas
(
“canvas”
)
;
canvas
.
setWidth
(
document
.
body
.
scrollWidth
)
;
canvas
.
setHeight
(
250
)
;
var
line
=
new
fabric
.
Line
(
[
200
,
100
,
100
,
40
]
,
{
stroke
:
“blue”
,
strokeWidth
:
20
,
lockMovementX
:
“true”
,
}
)
;
canvas
.
add
(
line
)
;
How To Get The Most Out Of Steam With Augmented Steam
Steam is a unique case, a strange hybrid of an online game e-shop and a platform for managing and launching your favorite games. And, if you so wish, other media and programs. Valve’s creation has many fans, who used to say they wouldn’t replace it with anything. But that doesn’t mean it is perfect with no room for improvement.
Augmented Steam is an extension for the two most popular browsers, Chrome and Firefox. It wakes up and starts working whenever we visit the Valve store through those browsers, transmutating it behind the scenes. The result is the Steam we all know, but better, friendlier, and in the long run, cheaper.
Some of the useful additions Augmented Steam slaps on Steam are:
Price comparison based on data from many popular online stores
Lowest available price and historically lowest price displayed for each title
Game scores from OpenCritic and MetaCritic on each title’s page
“Ignored” titles being hidden from search results
InstallationAccept your browser’s security warning that Augmented Steam will access your data on the Steam and IsThereAnyDeal sites.
Configuration and usageBefore you start using it, go through all the configuration options of Augmented Steam. To do so, visit the list of add-ons on your browser, and from there, Augmented Steam’s options.
Augmented Steam provides a wide variety of options and parameters that allow you to change the way it operates, select which modifications you’d like it to apply on Steam, and even change the colors it will use to “mark” some titles.
While it’s worth looking at all the options, we find most of the defaults to be adequate for most users. The only things we would – and did – change are:
PRICE: Disable Auto-detect and select desired primary currency
The most important and useful addition shows up when you visit any game’s page. Just below the top slideshow and right above the game’s title, you’ll see the best price for the title as found on other competing sites. Just below this, you’ll see the title’s historically lowest price.
How come that’s useful? In the first case, it’s obvious: If a title has a lower price elsewhere, you can buy it from there. It’s worth noting how many of those alternative-to-Steam stores also offer Steam keys. In such cases, after purchasing a game on a different store and getting a Steam key to go with it, you’ll be able to return to Steam and “activate it” there. The result will be the same as if you originally bought it on Steam.
A “historically low price” might seem more like a tease, a lost opportunity, since it usually shows a drastically lower price than what you’ll have to pay now to get a title.
If you think about it, a low historical price means that the title, if you’re willing to play the long waiting game, can and probably will be available much cheaper, again, sometime in the future – perhaps during the next Steam sale. In other words, if you don’t want the title here and now, your wallet will thank you for waiting.
Leave the mouse pointer hovering above the title price, and you’ll see how it fluctuates between different countries. A dramatic difference in its price in one country can be a good indication that a similar reduction will soon appear elsewhere. Again, in such cases it’s worth playing the waiting game instead of buying the actual game itself.
If you check out the informational panels on the right side of Steam, you’ll see some new entries among the familiar crowd. One of them is a direct link to the game’s page on IsThereAnyDeal, the site from where Augmented Steam pulls its price data. Right after it, in the same info panel, you’ll find links to Steam Database and PCGamingWiki, with the latter being more useful for the majority of people. There you can find information on the title’s compatibility with newer operating systems, and instructions, tips, and tools to help it run at its best.
In the game’s details panel, where you can see if it’s single or multi-player, supports Steam Workshop, etc., you will also see a more vivid notice about any “content protection” used in the title. It was already there, but Augmented Steam makes it pop out more to make sure you don’t miss it in case you want to avoid such “annoyances.”
Protections and Digital Rights Management (DRM) are good for protecting a game creator’s rights on the title but can become a significant problem for everyone who only wants to enjoy a game. Just ask anyone who’s bought Darkspore, only to have its box gathering dust on a shelf since the game is unplayable today, thanks to its online protection not being as “online” anymore. Or try playing any game with the latest (back then) versions of the SafeDisc and TAGES protections on anything newer than Windows XP on a PC without optical drives and prepare for a royal headache.
If a game you want comes with a copy protection you’d rather avoid, you can either forget about it or check if it’s available on GOG. The GOG store has a policy of not carrying any titles with DRM.
In the cases of games re-released through it, their team tries to strip any DRM while offering upgraded compatibility with newer systems.
Apart from the above, you’ll also be able to check at a glance the title’s ratings at MetaCritic, UserScore, and OpenCritic. This is extra useful during shopping spree, when your wallet’s run dry and you barely have enough funds for only one out of two games. The games score on those sites might end up being what helps you choose one over the other.
Similarly useful, the HowLongToBeat info gives a ballpark figure of how much time you’ll have to invest in a game to complete it. If it’s a frantic period in your life, with not much time for gaming, you should probably avoid cases like the Witcher series (over 100 hours each)!
ConclusionAugmented Steam makes lots of small, barely noticeable changes and doesn’t look that of an improvement after you install it and revisit Steam. Soon, though, the features it adds become indispensable, bit by bit, elevating the whole experience of using Steam’s site.
Like most of us who are already using Augmented Steam, you’ll probably appreciate its usefulness only when, after using it for some time and for some reason, you’ll have to browse Steam’s site without it.
Odysseas Kourafalos
OK’s real life started at around 10, when he got his first computer – a Commodore 128. Since then, he’s been melting keycaps by typing 24/7, trying to spread The Word Of Tech to anyone interested enough to listen. Or, rather, read.
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How To Get The Size Of The Tables Of A Mysql Database?
To get the size of the tables of a MySQL database, you can use the “information_schema.tables”.
Here is the syntax to know the size of all tables.
SELECT TABLE_NAME AS `ALLTABLESNAME`, ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `TABLESIZEIN(MB)` FROM information_schema.TABLES WHERE TABLE_SCHEMA = "yourDatabaseName" ORDER BY (DATA_LENGTH + INDEX_LENGTH) ASC;Let us apply the above syntax to get the size of the tables.
Sample Output.
| ALLTABLESNAME | TABLESIZEIN(MB) | | studentrecordwithmyisam | 0 | | querydatedemo | 1 | | rownumberdemo | 0 | | secondtable | 0 | | spacecolumn | 2 | | table1 | 0 | | tbldemotrail | 2 | | tblstudent | 0 | | timestamptodatedemo | 1 | | uniqueconstraintdemo | 0 | | usernameandpassworddemo | 2 | | addingunique | 5 | | bookindexes | 0 | | tblf | 0 | | uniquedemo | 2 | | multipleindexdemo | 0 | | uniquedemo1 | 0 | | foreigntable | 5 | | tabledemo2 | 0 | | foreigntabledemo | 2 | | studentenrollment | 0 | | tabledemo3 | 0 | | duplicatebookindexes | 0 | | clonestudent | 2 | | student | 0 | 26 rows in set (10.29 sec)How To Style Background Image To No Repeat With Javascript Dom?
In this tutorial, we will learn to style the background image to no repeat with JavaScript DOM. To style the background image to no repeat with JavaScript, use the backgroundRepeat property. It allows you to set whether the background image repeats or not on a page.
The use of images in the background really makes the page attractive. But before using the image in the background, one must need completely understand the properties used to set the images as the background.
Otherwise, it will create problems for you like not showing the full image in the background, repeating the image horizontally or vertically many times, etc. In this tutorial, we are going to discuss how we can style the background image to no-repeat with JavaScript DOM.
Using the backgroundRepeart PropertyTo style the background image to no repeat, we use the backgroundRepeat property that takes the similar values as we give to the background-epeat property in CSS. The backgroundRepeat property accepts the following value −
initial − The initial value will set the backgroundRepeat property to its default value.
inherit − It will set the same value which given to the parent element of the element to which we are currently setting the property.
repeat − This is the default value of the backgroundRepeat property that repeats the image in both horizontal as well as vertical directions.
repeat-x − It sets the property to repeat the image in the horizontal direction only.
repeat-y − It sets the property to repeat the image in the vertical direction only.
no-repeat − This value sets the backgrounRepeat property to never repeat the image neither in horizontal nor in the vertical direction.
SyntaxThe following syntax will be followed to set the backgroundRepeat property to style background image to no repeat −
var varName=document.getElementById('id') varName.style.backgroundRepeat="value";In the above syntax, first, we get the element to which we want to set the property using its id and then assign a value to the property.
Let us under it with help of some code examples.
Algorithm
Step 1 − In the first step, we attach a background image to the body element of the document using internal CSS.
Step 2 − In the next step, we will change the backgroundRepeat to no−repeat using JavaScript DOM, which is by default set to repeat.
Example 1The below example will explain how we can use the backgroundRepeat property to style the background image to no repeat with JavaScript DOM −
body { } function display() { var obj = document.getElementById(“result”); var body = document.body; body.style.backgroundRepeat = “no-repeat”; }
Let us discuss another example in which the image is repeating in the horizontal direction −
NOTE − The algorithm of the above example and this example is almost similar; you just need to add the background−repeat property in internal CSS while giving a background image to the body tag. As shown below example −
Example 2The example below will illustrate the use of backgroundRepeat property −
body { background-repeat: repeat-x; } function display() { var obj = document.getElementById(“result”); var body = document.body; body.style.backgroundRepeat = “no-repeat”; }
Let us see another example where the image is repeating in the vertical direction.
NOTE: The algorithm of this example is similar to the previous one; you just need to replace the repeat−x in the previous example with repeat−y to repeat the image in the vertical direction.
Example 3Below example shows the vertical image repetition stopped using the backgrounRepeat with JavaScript −
body { background-repeat: repeat-y; } function display() { var obj = document.getElementById(“result”); var body = document.body; body.style.backgroundRepeat = “no-repeat”; }
In this example, we have stopped the image repeating in the vertical direction by using the backgroundRepeat property with JavaScript DOM.
In this tutorial, we have learned about the backgroundRepeat property of JavaScript DOM to stop repeating the image in any direction, whether it is repeating in vertical, horizontal or in both directions.
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