What methods does the canvas object have?
The methods of the canvas object include getContext(type), save(), restore(), beginPath(), moveTo(), lineTo(), rect(), arc(), quadraticCurveTo(), bezierCurveTo( ), stroke(), fill(), clearRect(), getImageData(), putImageData(), etc.
#The operating environment of this article: Windows 10 system, Dell G3 computer.
The canvas object is an element in HTML5 and is used to draw graphics, animations and other visual effects on web pages. It provides a series of methods for drawing graphics, adding text, transforming elements, and handling user interaction. The following are some common methods of canvas objects:
getContext(type): Get the drawing context. The type parameter specifies the type of context to use, usually "2d" for a two-dimensional context.
save(): Save the current drawing state. You can use the restore() method to restore to a previously saved state.
restore(): Restore the previously saved drawing state.
beginPath(): Start a new path.
closePath(): Close the current path.
moveTo(x, y): Move the path to the specified coordinate position.
lineTo(x, y): Add a straight line path to the specified coordinate position.
rect(x, y, width, height): Create a rectangular path.
arc(x, y, radius, startAngle, endAngle, anticlockwise): Create an arc path.
quadraticCurveTo(cp1x, cp1y, x, y): Create a quadratic Bezier curve path.
bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y): Create a cubic Bezier curve path.
stroke(): Draw the border of the current path.
fill(): Fill the content of the current path.
clearRect(x, y, width, height): Clear the pixels of the specified rectangular area.
getImageData(x, y, width, height): Get the pixel data of the specified rectangular area.
putImageData(imageData, x, y): Draw pixel data to the specified position.
createLinearGradient(x0, y0, x1, y1): Create a linear gradient object.
createRadialGradient(x0, y0, r0, x1, y1, r1): Create a radial gradient object.
createPattern(image, repetition): Create a pattern object.
drawImage(image, x, y, width, height): Draw an image.
fillText(text, x, y [, maxWidth]): Draw fill text.
strokeText(text, x, y [, maxWidth]): Draw text border.
measureText(text): Returns an object containing the specified text width.
rotate(angle): Rotate the current drawing.
scale(scaleX, scaleY): Scale the current drawing.
translate(x, y): Translate the current drawing.
transform(a, b, c, d, e, f): Apply a matrix transformation.
setTransform(a, b, c, d, e, f): Reset the current matrix transformation.
The above are some common methods of the canvas object, which can be used in combination to achieve various drawing effects and animations.
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