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Questions - putimagedata

Orthographic perspective map ̀problems

I was trying to make a sphere using some data I found on Wikipedia about the Orthographic projection of a map and there's been something that has been keeping me busy for some time. When I run the pro...
test-img

MisterJuanXDLOL

javascript

html

3d

orthographic

putimagedata

Votes: 0

Answers: 1

Latest Answer

Ok, now I understand it. The value of longitude must be between -π/2 and π/2
test-img

MisterJuanXDLOL

Why is Javascript Canvas putImageData drawing a white image to screen?

I am trying to draw a gray gradient (or a few of them actually) to the canvas. To do this I am using the getImageData() and putImageData() methods of canvas. data is an Uint8ClampedArray with size 10...
test-img

Teodor Dyakov

javascript

html

canvas

html5-canvas

putimagedata

Votes: 0

Answers: 1

Latest Answer

You're not setting the alpha channel. for (let y = 0; y < canvas.height; y++) { for (let x = 0; x < canvas.width; x++) { let idx = (y * canvas.width + x) * 4; for (let color = 0; colo...
test-img

Pointy

Canvas.putImageDate - Weird Behaviour

I'm trying to use perlin noise to create a noise map using html canvas. Here's my code: const width = noiseMap.length const height = noiseMap[0].length const colorM...
test-img

Thiago Facchini

javascript

html5-canvas

putimagedata

Votes: 0

Answers: 1

Latest Answer

Thanks everyone who tried to help. The issue was quite simple, the line: pixelIndex = index * 4 was the cause, it would blow the imagedata.data array by one position, so the solution was quite simple...
test-img

Thiago Facchini

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