This tutorial builds off of a previous tutorial I did on creating a basic spinning wheel image carousel. Create a ReactJS ADVANCED Wheel Carousel. Give more life to a basic spinning image gallery.
Give more life to a basic spinning image gallery.
This tutorial builds off of a previous tutorial I did on creating a basic spinning wheel image carousel. Check that out here before moving on:
Or check out the video tutorial here:
We’ll start by balancing the images so they don’t appear upside down. This is simple, we’ll just rotate the images in the opposite direction that we rotate the wheel…
1. We’ve converted the units that spin the wheel from radians to degrees by dividing ‘event.deltaY’ by 360.
2. We’ve added ‘transitionDelay’ and ‘transitionDuration’ attributes to the wheel.
Now, before we get to writing that snapping point function, we need to setup two things:
To solve problem one, we’ll create a function that allows a counter in our “Wheel.js” component to increase, then pass that function to each “Card.js” component.
When a card/image mounts (‘componentDidMount()’ life cycle) it will execute that function.
To solve problem two, we already have a mechanism that tells us when our wheel has stopped spinning, the ‘setTimeout’.’
We know that we want to call our ‘snap back’ function after the wheel stops, so we’ll track the ‘snap_in_progress’ variable using the state; and in our ‘onWheel’ listener we’ll just test that there isn’t a “snap in progress” and that all of our cards haveloaded.
We call the ‘snap_back()’ function after our wheel has stopped spinning. We’ll write this function later.
We need to calculate** three things**:
We’ll calculate the angle of the snapping point, by taking the X and Y coordinates of any card/image and feed it into an inverse tan function.
Using the inverse tan function to find the angle.
1. We add the ‘snap_point’ to our state.
2. In the ‘children_loaded()’ function, we establish the ‘X’ and ‘Y’ coordinates of our snapping point once all cards have loaded.
3. We calculate the angle of our snapping point in the ‘snap_back()’ function.
To determine the closest card to our snapping point, we’ll compare the distance from the snapping point to all the other cards/images and we’ll choose the distance with the lowest value.
Pythagorean Theorem applied.
We use the *Pythagorean Theorem *to calculate the distance between snapping points and cards.
1. We start by choosing any card to be the shortest distance, doesn’t matter which; we need to start with something.
2. We then loop through all of the cards, including the one we picked (doesn’t matter), we calculate and compare distances to find the lowest number.
To get the difference in angles between our snapping point and closest card, we’ll calculate the angle of our closest card using the** inverse tan **function (like earlier), and we’ll just take the difference between the two.
Finally, we’ll spin the wheel and images(in the opposite direction) using the ‘theta_between’ angle we’ve calculated…
1. The ‘if’ conditional tree makes sure the wheel is rotating in the correct direction based on which QUADRANT the snapping point and image fall in. For more information on this, check out my video tutorial; link down below.
2. Remember to change the ‘snap_in_progress’ to false and keep track of how much the wheel spun with ‘theta’.
All we really need to do is convert this FUNCTION component into a CLASS component and remember to call that ‘amloaded()’ function in the ‘componentDidMount()’ life cycle function.
Easily change the JSX DIV element in the render function to a JSX IMG element.
ReactJS ADVANCED Wheel Image Gallery
If you would like a more in-depth guide, check out my full video tutorial on YouTube, An Object Is A.
UPGRADE to an ADVANCED ReactJS Image Wheel Carousel (2020 Web Design)
Originally published on Medium
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