I want this word to be drawn with an animation, such that the page “writes” the word out the same way that we would Canvas version This will draw single chars more like one would write by hand. It uses a long dash-pattern where the on/off order is swapped over time per char. It also … Read more
As a guess, I’d say it was this paragraph from the spec. When its canvas context mode is none, a canvas element has no rendering context, and its bitmap must be fully transparent black with an intrinsic width equal to the numeric value of the element’s width attribute and an intrinsic height equal to the … Read more
Ken’s answer in the marked as duplicate answer indeed does the same operation as xMinYMin slice if you call it like drawImageProp(ctx, img, 0, 0, canvas.width, canvas.height, 0, 0). But for the ones who want the full implementation of the svg’s preserveAspectRatio attribute, here is one : It does return an object with sx,sy,sw,sh,dx,dy,dw,dh as … Read more
To achieve some kind of flexibility, you have to decide of a convention inside your text that will tell that the style changed. And also, you’ll have to use measureText to be able to fillText separate ‘runs’ of the text, each run using the right style, measureText(thisRun).width will give you the size in pixels of … Read more
What you are asking for, to retrieve the physical displayed size in cm of anything digital, can’t be done without a lot of heuristics, that is, we as web-developer have no way to do it for all our visitors. About Your formula: DPI – Dots Per Inch. This is a measure of how many dots … Read more
Inverse Matrix This answer include rotation as well because the scale is part of the rotation in the matrix you can’t really exclude one or the other. But you can ignore the rotation (set it as zero) and just set scale and translation and it does what you want. The inverse transform. It basically does … Read more
What you need to do: Get the buffer Get a 32-bits reference of that buffer (If your other pixels are transparent then you can use a Uint32Array buffer to iterate). Scan 0 – width to find x1 edge Scan width – 0 to find x2 edge Scan 0 – height to find y1 edge Scan … Read more
Canvas is a simple bitmap and does not supporting embedding of DOM elements (such as input). To accomplish this, you will need to “fake” the input by typing and use the fillText of context to draw in the text on the canvas. You can for example place the input element on top of canvas when … Read more
If you want a customized background color then, you’d have to draw a background with your preferred color, and you can do so, like this … var backgroundColor=”white”; Chart.plugins.register({ beforeDraw: function(c) { var ctx = c.chart.ctx; ctx.fillStyle = backgroundColor; ctx.fillRect(0, 0, c.chart.width, c.chart.height); } }); DEMO // draw background var backgroundColor=”white”; Chart.plugins.register({ beforeDraw: function(c) { … Read more
Use .arc to create a circular stroke and then use .clip() to make that the current clipping region. Then you can use .clearRect() to erase the whole canvas, but only the clipped area will change.