Let’s say we want to apply a SVG filter on a canvas element. According to this we can apply a SVG filter to the CanvasRenderingContext2D in javascript like this, the filter will only affect shapes drawn after that call: We can also just apply the filter in CSS on the whole canvas: I need to apply the fi…
Tag: html5-canvas
Simulating a mouse click at (x, y) on an HTML5 canvas element
I’ve been attempting to programmatically simulate a mouse click at arbitrary coordinates on a canvas element. Because of technology constraints, I need to avoid jQuery which would make this easier. Using this answer, I am able to get coordinates of manual clicks. Using this answer, I’m able to pro…
JS remove event listener with no condition?
I have the following code As you can see the resize event listener recursively calls setSize(). I did this so that I could handle initial size setup and window resizing in the same function. The problem is that every recurse will add an additional eventListener, rather than replacing the last. So I need to re…
How can set pointerDown for each of rectangle on Phaser 3
I’m trying to set up the Conway’s Game of Life using Phaser. My question is this: how can I make a Rectangular of the Phaser.geom class contain a click event? Class Dots: Class Game: Answer You are setting interactive on the graphics serveral time, it the forEach-loop. I think this can be done only once…
Canvas API implementation
I recently started to learn a bit about how javascript work under the hood, and came to know that (in the context of chrome) v8 engine and web APIs are different. Here’s some questions I have regarding the canvas API specifically: Why do we need to use getImageData() every time we want to access the pix…
How do I add a color filter to an image so that its average RGB gets closer to that color?
I have a 100×100 image: I get all of its pixels and I calculate the average RGB of that image: I also have a reference RGB of a different color: I know now want to add a filter to the image, so that the avgRgbOfImg gets pretty close to my refRgb: In simpler terms, I have an image and I
Download pixel art drawing as .png in PhaserJS
I need to download the created pixel drawing from this Phaser example as a .png image via FilesSaver.js but the canvas returns null. Error: Uncaught TypeError: Cannot read properties of null (reading ‘toBlob’) This is the save function: drawingArea: (PhaserJS 2) How to get the data of the drawing …
Drawing A Rotated Path2D Object on canvas
I have a canvas where i want to draw a rotated svg. In order to achieve this, i created a Path2D object and used the context.fill() option to draw the svg. Moreover, I used context.translate(x , y) inorder to position the svg. Now, the issue i how to rotate this? I found some solutions where it stated that fi…
HTML5 Canvas stroke not following mouse Y point
I’m writing a drawing app in HTML5 Canvas, which includes a freehand draw with the mouse. I have a problem whereby the mouse move to draw the stroke is not under the crosshair cursor. The X co-ordinate is fine, but the Y coordinate is offset by a varying amount as the mouse pointer is moved (closer at t…
Drawing the floor tiles with html5 canvas but it is note perfect.how can i make realistic using webgl
didn’t look like a floor tiles. Some transformation / rotate / Angle was missing. How to do perspective view with html5 canvas here is the code If there is another solution to implement the feature or If there are third party plugins which can transform my canvas to some angle to be look like a floor of…