The HTML “canvas” element is used to draw graphics via JavaScript. The “canvas” element is only a container for graphics. One must use JavaScript to actually draw the graphics. Canvas has several methods for drawing paths, boxes, circles, text, and adding images.
Example: This example shows the basic use of Canvas in HTML.
<!DOCTYPE html> < html >
< head >
< title >
HTML canvas beginPath() Property
</ title >
</ head >
< body style = "text-align:center;" >
< h1 style = "color:green;" >
GeeksforGeeks
</ h1 >
< h2 >HTML canvas beginPath() Property</ h2 >
< canvas id = "GFG" width = "500" height = "300" ></ canvas >
< script >
var GFG = document.getElementById("GFG");
var context = GFG.getContext("2d");
// Create a path
context.beginPath();
// Set the path width
context.lineWidth = "8";
// Set the path color
context.strokeStyle = "green";
context.moveTo(100, 250);
context.lineTo(150, 50);
context.lineTo(250, 250);
context.stroke();
context.beginPath();
</ script >
</ body >
</ html >
|
Output:
HTML Canvas Reference Complete Reference
Colors, Styles, and Shadows Properties and Methods
Properties |
Description |
Example |
---|---|---|
fillStyle | Return the color, gradient, or pattern used to fill the drawing. | |
strokeStyle | Return the stroke of color, gradient, or pattern used in the drawing. | |
shadowColor | Set to a string representing a CSS color value, which we want as shadow color. | |
shadowBlur | Return the blur level for shadows. | |
ShadowOffsetX | Return the horizontal distance of the shadow from the shape. | |
ShadowOffsetY | Return the vertical distance of the shadow from the shape. |
Methods |
Description |
Example |
---|---|---|
createLinearGradient() | Gradient can be used to fill different colors in rectangles, circles, lines, text, etc | |
createPattern() | It is used to repeat the specified element in the specified direction. | |
addColorStop() | It is used to specify the color and its position in the gradient object. |
Line Styles Properties
Properties |
Description |
Example |
---|---|---|
lineCap | Set or return the style of end caps of line. | |
lineJoin | Return the type of corner created, when two lines meet, by using the lineJoin property. | |
lineWidth | Return the width of the line (thickness of the line). | |
miterLimit | It is used to or returns the maximum miter length. |
Rectangles Methods
Methods |
Description |
Example |
---|---|---|
rect() | Create a rectangle in HTML. | |
fillRect() | It is used to fill the rectangle using the given color. | |
strokeRect() | It is used to draw a rectangle in a given color. | |
clearRect() | Clear the specified pixels within a given rectangle. |
Paths Methods
Methods |
Description |
Example |
---|---|---|
fill() | It is used to fill the current drawing path. | |
stroke() | Draw the path you have defined with all those moveTo() and lineTo() methods. | |
beginPath() | It is used to start a path or reset the current path. | |
moveTo() | Move the path to the specified point in the canvas, without creating a line. | |
closePath() | Create a path from the current point back to the starting point. | |
lineTo() | It is used to add a new point to create a line from that point to the last specified point in the canvas | |
clip() | It is used to clip a region/part of any shape and size from the given/original canvas. | |
quadraticCurveTo() | Create a quadratic curve on the canvas | |
bezierCurveTo() | Bezier curves on HTML canvas are drawn using a start point, one or more control point/points, and an endpoint. | |
arc() | Create an arc/curve i.e. circles or parts of circles. | |
arcTo() | Create an arc/curve between two tangents on the canvas. | |
isPointInPath() | Check whether or not the specified point is contained in the current path. |
Transformations Methods
Methods |
Description |
Example |
---|---|---|
scale() | It is used to scale the current drawing into a smaller or larger size. | |
rotate() | It is used to rotate the drawing by a given angle. | |
translate() | Specify that the object is translated by the given translation amount. | |
transform() | It is used to replace the current transformation matrix | |
setTransform() | It is used to replace the current transformation matrix |
Text Properties and Methods
Properties |
Description |
Example |
---|---|---|
font | Change the present font family of the Text content of the <canvas> element. | |
textAlign | Return the current alignment for text content, according to the anchor point. | |
textBaseline | Return the baseline of the current text. |
Methods |
Description |
Example |
---|---|---|
fillText() | It is used to draw filled text on the canvas. | |
strokeText() | Draw text (with no fill) on the canvas, by using strokeText() Method. | |
measureText() | Return an object that represents the width of the specified text in terms of pixels. |
Pixel Manipulation Properties and Methods
Properties |
Description |
Example |
---|---|---|
width | It is used to specify the width of the <canvas> in terms of pixels. | |
height | It is used to specify the height of the <canvas> element in terms of pixels. |
Methods |
Description |
Example |
---|---|---|
createImageData() | It is used to create a new blank ImageData object. | |
getImageData() | It is used to copy the pixel data for the specified rectangle on a canvas. | |
putImageData() | It is used to put the image data back into the canvas from a specified ImageData object. |
Compositing & Image Drawing Properties and Methods
Properties |
Description |
Example |
---|---|---|
globalAlpha | set or return the current alpha or transparency value of the drawing. |
Methods |
Description |
Example |
---|---|---|
drawImage() | It is used to display an image or video on canvas. |