freelanceshack.com
-
7 min readTo test a Vuex module using Mocha and Chai, you can create a unit test file for your module and import the necessary libraries. Within your test file, you can create a mock store using Vuex's createStore function and define test cases using Mocha's describe and it functions.You can then use Chai's expect function to make assertions about your module's state mutations and actions.
-
8 min readTo debug a Node.js/Mocha test built with a Makefile, you can use the Node.js debugger by adding the --inspect flag to the node command in your Makefile. This will start the Node.js debugger on a specified port. You can then connect to the debugger using a Chrome DevTools or any other debugging client that supports the Chrome DevTools Protocol.Alternatively, you can use the --inspect-brk flag to start the debugger in a paused state, allowing you to set breakpoints in your code before it runs.
-
6 min readTo drag a drawn circle within a canvas, you can start by creating the circle using the canvas drawing functions. Then, you need to add event listeners for the mouse down, mouse move, and mouse up events on the canvas element.When the mouse is pressed down on the circle, you can save the initial mouse position relative to the circle's position. As the mouse moves, calculate the new position of the circle using the current mouse position and the initial offset.
-
3 min readTo make a canvas boundary, you can use the CSS property "border" to define the boundary of the canvas element. The border property allows you to specify the width, style, and color of the border. You can also use the "border-radius" property to round the corners of the canvas element if desired. Additionally, you can use the "padding" property to add space between the boundary and the content within the canvas.
-
5 min readTo simulate a click on a canvas with specific coordinates, you can use JavaScript to target the canvas element and trigger a click event at the desired coordinates. This can be achieved by calculating the relative position of the canvas on the page, and then creating a custom event with the specified coordinates. By dispatching this custom event on the canvas element, you can effectively simulate a click at the specified location.
-
7 min readTo export only the canvas as an image, you can convert the canvas to a data URL using the toDataURL() method in HTML5. This method converts the canvas drawing into a base64 encoded image that can be saved or displayed. Once you have the data URL, you can create an image element in JavaScript, set its source to the data URL, and then use a method to save the image as a downloadable file or display it on the screen.
-
6 min readTo fully fade out contents in a canvas, you can use the globalAlpha property of the canvas 2D rendering context.Set globalAlpha to a value between 0 and 1 to control the transparency of the contents drawn on the canvas.For a fade-out effect, you can gradually decrease the globalAlpha value over a series of frames or time intervals.To fully fade out the contents, set globalAlpha to 0. Once it reaches 0, the contents will be fully faded out.
-
3 min readTo scroll the canvas by dragging it, you can add event listeners for the mousedown, mousemove, and mouseup events on the canvas element.When the mousedown event is triggered, you can save the initial clientX and clientY coordinates in variables.Then, on mousemove event, calculate the distance moved by subtracting the current clientX and clientY from the initial coordinates.Update the canvas position by adding the distance moved to its current position.
-
5 min readTo display m3u8 video to canvas in Safari, you can use the MediaSource API in JavaScript. First, you need to create an HTML5 video element and set its source to the m3u8 file. Then, create a source buffer using the MediaSource API and append the video segments to it. As the segments are appended, decode and render them to a canvas element using the drawImage method. This will allow you to display the m3u8 video on the canvas in Safari.
-
4 min readTo rotate a canvas image, you can use the transform() method in HTML5 canvas. This method allows you to apply transformations to the canvas such as rotation, scaling, and translation. To specifically rotate an image, you would use the rotate() method in conjunction with the drawImage() method to draw the image onto the canvas at the desired rotation angle.
-
8 min readTo group tiles in an HTML canvas, you can organize them by creating separate functions or classes for each tile group. In each function or class, you can define the properties and methods specific to that tile group, such as position, size, color, and behavior.When drawing the tiles on the canvas, you can call the functions or classes for each group separately, passing in the necessary parameters. This way, you can easily manage and manipulate different groups of tiles independently.