Answers for "javascript canvas rectangle rounded corners"

canvas round rectangle

function draw() {
  var canvas = document.getElementById('canvas');
  if (canvas.getContext) {
    var ctx = canvas.getContext('2d');

    roundedRect(ctx, 12, 12, 150, 150, 15);
    roundedRect(ctx, 19, 19, 150, 150, 9);
    roundedRect(ctx, 53, 53, 49, 33, 10);
    roundedRect(ctx, 53, 119, 49, 16, 6);
    roundedRect(ctx, 135, 53, 49, 33, 10);
    roundedRect(ctx, 135, 119, 25, 49, 10);

    ctx.beginPath();
    ctx.arc(37, 37, 13, Math.PI / 7, -Math.PI / 7, false);
    ctx.lineTo(31, 37);
    ctx.fill();

    for (var i = 0; i < 8; i++) {
      ctx.fillRect(51 + i * 16, 35, 4, 4);
    }

    for (i = 0; i < 6; i++) {
      ctx.fillRect(115, 51 + i * 16, 4, 4);
    }

    for (i = 0; i < 8; i++) {
      ctx.fillRect(51 + i * 16, 99, 4, 4);
    }

    ctx.beginPath();
    ctx.moveTo(83, 116);
    ctx.lineTo(83, 102);
    ctx.bezierCurveTo(83, 94, 89, 88, 97, 88);
    ctx.bezierCurveTo(105, 88, 111, 94, 111, 102);
    ctx.lineTo(111, 116);
    ctx.lineTo(106.333, 111.333);
    ctx.lineTo(101.666, 116);
    ctx.lineTo(97, 111.333);
    ctx.lineTo(92.333, 116);
    ctx.lineTo(87.666, 111.333);
    ctx.lineTo(83, 116);
    ctx.fill();

    ctx.fillStyle = 'white';
    ctx.beginPath();
    ctx.moveTo(91, 96);
    ctx.bezierCurveTo(88, 96, 87, 99, 87, 101);
    ctx.bezierCurveTo(87, 103, 88, 106, 91, 106);
    ctx.bezierCurveTo(94, 106, 95, 103, 95, 101);
    ctx.bezierCurveTo(95, 99, 94, 96, 91, 96);
    ctx.moveTo(103, 96);
    ctx.bezierCurveTo(100, 96, 99, 99, 99, 101);
    ctx.bezierCurveTo(99, 103, 100, 106, 103, 106);
    ctx.bezierCurveTo(106, 106, 107, 103, 107, 101);
    ctx.bezierCurveTo(107, 99, 106, 96, 103, 96);
    ctx.fill();

    ctx.fillStyle = 'black';
    ctx.beginPath();
    ctx.arc(101, 102, 2, 0, Math.PI * 2, true);
    ctx.fill();

    ctx.beginPath();
    ctx.arc(89, 102, 2, 0, Math.PI * 2, true);
    ctx.fill();
  }
}

// A utility function to draw a rectangle with rounded corners.

function roundedRect(ctx, x, y, width, height, radius) {
  ctx.beginPath();
  ctx.moveTo(x, y + radius);
  ctx.lineTo(x, y + height - radius);
  ctx.arcTo(x, y + height, x + radius, y + height, radius);
  ctx.lineTo(x + width - radius, y + height);
  ctx.arcTo(x + width, y + height, x + width, y + height-radius, radius);
  ctx.lineTo(x + width, y + radius);
  ctx.arcTo(x + width, y, x + width - radius, y, radius);
  ctx.lineTo(x + radius, y);
  ctx.arcTo(x, y, x, y + radius, radius);
  ctx.stroke();
}

javascript canvas rectangle rounded corners

let canvas = document.getElementById('example');
let ctx = canvas.getContext('2d');  
ctx.beginPath();
ctx.roundedRectangle(0, 0, 100, 100, 20);
ctx.stroke();

ctx.beginPath();  
ctx.roundedRectangle(5, 5, 90, 90, 15);
ctx.stroke();

CanvasRenderingContext2D.prototype.roundedRectangle = function(x, y, width, height, rounded) {
  const radiansInCircle = 2 * Math.PI;
  const halfRadians = (2 * Math.PI)/2;
  const quarterRadians = (2 * Math.PI)/4;  
  
  // top left arc
  this.arc(rounded + x, rounded + y, rounded, -quarterRadians, halfRadians, true);
  
  // line from top left to bottom left
  this.lineTo(x, y + height - rounded);

  // bottom left arc  
  this.arc(rounded + x, height - rounded + y, rounded, halfRadians, quarterRadians, true); 
  
  // line from bottom left to bottom right
  this.lineTo(x + width - rounded, y + height);

  // bottom right arc
  this.arc(x + width - rounded, y + height - rounded, rounded, quarterRadians, 0, true);  
  
  // line from bottom right to top right
  this.lineTo(x + width, y + rounded);

  // top right arc
  this.arc(x + width - rounded, y + rounded, rounded, 0, -quarterRadians, true); 
  
  // line from top right to top left
  this.lineTo(x + rounded, y);
}

canvas rounded corners

ctx.save();
ctx.beginPath();
ctx.closePath();
ctx.clip();
ctx.drawImage(Image)
ctx.restore();