How to Create a Clock Using the Latest CSS sin() and cos() Trigonometry Functions

CSS has come a long way since its inception in 1996. With the latest version of CSS, developers can create complex animations and designs that were once only possible with JavaScript. One of the latest additions to CSS is the sin() and cos() trigonometry functions. These functions allow developers to create dynamic and interactive designs, such as clocks. In this article, we will explore how to create a clock using the latest CSS sin() and cos() trigonometry functions.

Before we dive into the code, let’s first understand what sin() and cos() functions are. Sin() and cos() are mathematical functions that calculate the sine and cosine of an angle, respectively. In simpler terms, they help us calculate the position of a point on a circle based on its angle. This is useful when creating circular designs, such as clocks.

To create a clock using sin() and cos() functions, we need to first create a circle using CSS. We can do this by setting the width and height of a div element to the same value and then setting its border-radius property to 50%. This will create a perfect circle.

“`css

.clock {

width: 200px;

height: 200px;

border-radius: 50%;

}

“`

Next, we need to create the clock hands. We can do this by creating two div elements, one for the hour hand and one for the minute hand. We can position these div elements at the center of the clock using absolute positioning.

“`css

.clock {

position: relative;

}

.hour-hand,

.minute-hand {

position: absolute;

top: 50%;

left: 50%;

}

“`

Now comes the fun part. We can use sin() and cos() functions to calculate the position of the clock hands based on the current time. To do this, we need to first calculate the angle of each hand based on the current time. We can do this by dividing the current hour and minute by 12 and 60, respectively, and then multiplying the result by 360 (the number of degrees in a circle).

“`javascript

const now = new Date();

const hour = now.getHours() % 12;

const minute = now.getMinutes();

const hourAngle = (hour / 12) * 360;

const minuteAngle = (minute / 60) * 360;

“`

Once we have the angle of each hand, we can use sin() and cos() functions to calculate the position of each hand on the clock. We can do this by using the following formulas:

“`javascript

const hourX = Math.sin(hourAngle * (Math.PI / 180)) * 50 + 50;

const hourY = Math.cos(hourAngle * (Math.PI / 180)) * 50 + 50;

const minuteX = Math.sin(minuteAngle * (Math.PI / 180)) * 70 + 50;

const minuteY = Math.cos(minuteAngle * (Math.PI / 180)) * 70 + 50;

“`

These formulas calculate the x and y position of each hand based on its angle. We then set the position of each hand using CSS transform property.

“`css

.hour-hand {

transform: translate(-50%, -50%) rotate(hourAngledeg);

}

.minute-hand {

transform: translate(-50%, -50%) rotate(minuteAngledeg);

}

“`

And that’s it! We have created a clock using the latest CSS sin() and cos() trigonometry functions. You can see the full code below:

“`html

.clock {

width: 200px;

height: 200px;

border-radius: 50%;

position: relative;

}

.hour-hand,

.minute-hand {

position: absolute;

top: 50%;

left: 50%;

width: 4px;

height: 50px;

background-color: black;

transform-origin: bottom center;

}

.hour-hand {

transform: translate(-50%, -50%) rotate(hourAngledeg);

}

.minute-hand {

transform: translate(-50%, -50%) rotate(minuteAngledeg);

}

const now = new Date();

const hour = now.getHours() % 12;

const minute = now.getMinutes();

const hourAngle = (hour / 12) * 360;

const minuteAngle = (minute / 60) * 360;

const hourX = Math.sin(hourAngle * (Math.PI / 180)) * 50 + 50;

const hourY = Math.cos(hourAngle * (Math.PI / 180)) * 50 + 50;

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