A radial gradient applied to a circle
<!DOCTYPE html> <html> <head> <style> #canvas { /*www . j ava 2 s. c om*/ border:1px solid #03F; background:#CFC; } </style> </head> <body> <canvas id="canvas" width="640" height="480"></canvas> <script> let context = document.getElementById('canvas').getContext('2d'); let gr = context.createRadialGradient(50,50,25,100,100,100); // Add the color stops. gr.addColorStop(0,'rgb(255,0,0)'); gr.addColorStop(.5,'rgb(0,255,0)'); gr.addColorStop(1,'rgb(255,0,0)'); // Use the gradient for the fillStyle. context.fillStyle = gr; context.arc(100, 100, 100, (Math.PI/180)*0, (Math.PI/180)*360, false); context.fill(); </script> </body> </html>