Canvas Draw Lines

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How to Draw a Line

To draw a line, follow these steps

  1. canvas - Assigning the canvas element to a variable.
  2. ctx - Assigning the 2d rendering context to another variable by calling the getContext('2d') method.
  3. beginPath() - Use beginPath() canvas method to start a new path by emptying the list of sub-paths.
  4. moveTo() - Use moveTo() canvas method to begin a new sub-path at the point specified by the given (x, y) coordinates.
  5. lineTo() - Use lineTo() canvas method to add a straight line to the current sub-path by connecting the sub-path's last point to the specified (x, y) coordinates.
  6. stroke() - Use stroke() canvas method to stroke (outline) the current or given path with the current strokeStyle. The default strokeStyle is 'black'.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <canvas width="160" height="110" id="point"> Your browser does not support the canvas element. </canvas> <script> var canvas = document.getElementById('point'); var ctx = canvas.getContext('2d'); ctx.beginPath(); // Start a new path ctx.moveTo(0, 0); // Move the pen to (0, 0) ctx.lineTo(150, 100); // Draw a line to (150, 100) ctx.stroke(); </script> </body> </html>
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Syntax

ctx.lineTo(x, y)

Attributes Value

ValueExplanation
xSpecifies the x-axis coordinate of the line's end point.
ySpecifies the y-axis coordinate of the line's end point.

How to Custom Color the Line

To custom color the line, follow these steps

  1. canvas - Assigning the canvas element to a variable.
  2. ctx - Assigning the 2d rendering context to another variable by calling the getContext('2d') method.
  3. beginPath() - Use beginPath() canvas method to start a new path by emptying the list of sub-paths.
  4. moveTo() - Use moveTo() canvas method to begin a new sub-path at the point specified by the given (x, y) coordinates.
  5. lineTo() - Use lineTo() canvas method to add a straight line to the current sub-path by connecting the sub-path's last point to the specified (x, y) coordinates.
  6. strokeStyle - Use strokeStyle canvas property to specify the color to use for the strokes (outlines) around shapes. The default color is 'black'.
  7. lineWidth - Use lineWidth canvas property to set the thickness of lines.
  8. stroke() - Use stroke() canvas method to stroke (outline) the current or given path with the current strokeStyle. The default strokeStyle is 'black'.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <canvas width="160" height="110" id="point"> Your browser does not support the canvas element. </canvas> <script> var canvas = document.getElementById('point'); var ctx = canvas.getContext('2d'); ctx.beginPath(); ctx.moveTo(5, 5); ctx.lineTo(150, 100); ctx.strokeStyle = "#339933"; ctx.lineWidth = 5; ctx.stroke(); </script> </body> </html>
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How to Draw Square using Line

Use 4 lineTo() canvas method to draw a square using Line.

Example

HTML Online Editor
<!DOCTYPE html> <html lang="en-US"> <body> <canvas width="160" height="110" id="point"> Your browser does not support the canvas element. </canvas> <script> var canvas = document.getElementById('point'); var ctx = canvas.getContext('2d'); ctx.beginPath(); ctx.moveTo(5, 5); ctx.lineTo(5, 100); ctx.lineTo(105, 100); ctx.lineTo(105, 5); ctx.lineTo(5, 5); ctx.stroke(); </script> </body> </html>
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