What are the five canvas drawing methods?

The five drawing methods of canvas are drawing rectangle, drawing path, drawing text, drawing image and drawing gradient. Detailed introduction: 1. Draw a rectangle, you can draw a filled rectangle and a stroked rectangle. The filled rectangle uses the "fillRect(x, y, width, height)" method, where x and y are the coordinates of the upper left corner of the rectangle, width and height are the width and height of the rectangle, and the stroked rectangle uses "strokeRect(x, y, width , height)" method, the usage is similar and so on.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Canvas is an element in HTML5 used to draw graphics, animations and other visual effects on web pages. It provides several drawing methods that can be used to create various types of graphics. The following are the five main drawing methods in Canvas:

Drawing rectangle (rect):

Canvas provides methods for drawing rectangles, which can draw filled rectangles and stroked rectangles. Fill a rectangle using the fillRect(x, y, width, height) method, where x and y are the coordinates of the upper left corner of the rectangle, and width and height are the width and height of the rectangle. The strokeRect(x, y, width, height) method is used to stroke a rectangle, and the usage is similar.

Drawing path (path):

Drawing path is one of the most powerful drawing methods in Canvas. It allows us to create complex shapes from a series of points. Path drawing methods include beginPath() (start path), moveTo(x, y) (move to specified coordinates), lineTo(x, y) (draw a straight line to specified coordinates), arc(x, y, radius, startAngle, endAngle , anticlockwise) (draw arc), closePath() (closed path), fill() (fill path), stroke() (stroke path), etc.

Draw text (text):

Canvas provides methods for drawing text, which can display customized text on the canvas. Methods for drawing text include fillText(text, x, y) (fill text) and strokeText(text, x, y) (stroke text), where text is the text content to be drawn, and x and y are the starting coordinates of the text. .

Drawing images (image):

Canvas can draw pictures, and you can use the drawImage(image, x, y, width, height) method to draw images to the canvas. where image is the image object to be drawn, x and y are the starting coordinates of the image, and width and height are the width and height of the image.

Drawing gradient:

Canvas provides methods for creating gradient effects. Gradient can be linear gradient or radial gradient. Linear gradients are created using the createLinearGradient(x0, y0, x1, y1) method, where x0 and y0 are the starting coordinates and x1 and y1 are the ending coordinates. Radial gradients are created using the createRadialGradient(x0, y0, r0, x1, y1, r1) method, where x0 and y0 are the coordinates of the center of the inner circle, r0 is the radius of the inner circle, x1 and y1 are the coordinates of the center of the outer circle, r1 is the radius of the outer circle. After creating the gradient, you can add color stops using the addColorStop(offset, color) method, and then apply the gradient using the fill() or stroke() methods.

The above are the five main drawing methods in Canvas, which can be used to create various graphics and effects. As a programmer, being proficient in the Canvas drawing method can help us achieve rich and diverse graphics and animation effects, and improve the interactivity and visual appeal of web pages.

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