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How to Fill Different Colors For Circles on Canvas?

4 minutes read

To fill different colors for circles on a canvas, you can use the fillStyle property of the canvas context. Once you have created a circle on the canvas using the arc method, you can set the fillStyle to a different color before calling the fill method to fill the circle with the specified color. You can repeat this process for each circle you want to fill with a different color on the canvas. Just make sure to set the fillStyle to the desired color before filling each circle.


How to create a 3D effect by filling circles with shadowed colors on canvas?

To create a 3D effect by filling circles with shadowed colors on canvas, follow these steps:

  1. Begin by drawing circles of various sizes on your canvas using a pencil or chalk. You can overlap the circles to create a layered effect.
  2. Choose a light source for your 3D effect. This will determine where the shadows fall on the circles. For example, if your light source is coming from the top left, the shadows will appear on the bottom right of each circle.
  3. Start filling in the circles with a base color using acrylic paint or oil paint. Use a lighter shade of the color where the light source hits the circles directly, and gradually darken the color as you move towards the shadowed areas.
  4. Next, mix a darker shade of the base color with a small amount of black paint to create shadows. Using a small brush, carefully add shadows to the circles where the light would not reach, such as the bottom and right side of each circle.
  5. Blend the shadowed areas with the base color using a clean brush or a sponge to create a smooth transition between light and shadow.
  6. Continue adding layers of color and shadows to each circle until you achieve the desired 3D effect. Experiment with different colors and shadow placements to create a dynamic and realistic look.
  7. Allow the paint to dry completely before adding any additional details or highlights to enhance the 3D effect.


How to fill a circle with a blurred color effect on canvas?

To fill a circle with a blurred color effect on canvas, you can follow these steps using HTML5 canvas and JavaScript:

  1. Create an HTML file with a canvas element:
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<!DOCTYPE html>
<html>
<head>
  <title>Blurred Circle</title>
</head>
<body>
  <canvas id="myCanvas"></canvas>
</body>
</html>


  1. Add JavaScript code to draw a circle with a blurred color effect on the canvas:
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const canvas = document.getElementById('myCanvas');
const context = canvas.getContext('2d');

// Set the radius and position of the circle
const x = canvas.width / 2;
const y = canvas.height / 2;
const radius = 50;

// Create a radial gradient for the circle
const gradient = context.createRadialGradient(x, y, 0, x, y, radius);

// Add colors to the gradient (you can add multiple colors for a more complex effect)
gradient.addColorStop(0, 'rgba(255, 0, 0, 1)'); // red color
gradient.addColorStop(1, 'rgba(255, 255, 255, 0)'); // transparent white color

// Fill the circle with the gradient
context.beginPath();
context.arc(x, y, radius, 0, 2 * Math.PI);
context.fillStyle = gradient;
context.fill();


  1. Save the HTML file and open it in your browser to see the blurred color effect applied to the circle on the canvas.


You can customize the colors and the gradient stops to achieve different blurred color effects. Experiment with different values to create the desired visual effect.


How to change the color of a circle on canvas using JavaScript?

To change the color of a circle on a canvas using JavaScript, you can follow these steps:

  1. Get a reference to the canvas element and its 2D drawing context:
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var canvas = document.getElementById('myCanvas');
var ctx = canvas.getContext('2d');


  1. Use the beginPath, arc, and fill methods to draw a circle on the canvas:
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ctx.beginPath();
ctx.arc(100, 100, 50, 0, 2 * Math.PI);
ctx.fillStyle = 'blue'; // Set the fill color to blue
ctx.fill();


  1. To change the color of the circle, simply change the fillStyle property to a different color before calling the fill method again:
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// Change the fill color to red
ctx.fillStyle = 'red';
ctx.fill();


By repeating these steps with different colors, you can change the color of the circle on the canvas using JavaScript.

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