All Questions
15
questions
1
vote
2
answers
86
views
Initialize a two-dimensional array with the values shown in the table below
Initialize a two-dimensional array with the values shown in the table below
1 0 0 0 1 0 0 0 1 0
0 4 0 0 0 4 0 0 0 4
0 0 9 0 0 0 9 0 0 0
0 0 0 ...
1
vote
1
answer
168
views
Javascript matrix check neighbor state to find edges
i am making a virtual Hama beads tool online. (its a kids toy where you put plastic beads on a matrix and iron them to make them stick together and form a solid shape)like this one below (real hama)
...
- 11
0
votes
3
answers
952
views
Get bounding rect from path2D or context2D
I want to calculate the bounding rect of a shape after I scale or rotate it.
First of all, I want to get the width and height.
const ctx = document.body.appendChild(document.createElement('canvas'...
- 105
0
votes
1
answer
144
views
path2D rotation badworking
I want to rotate objects using path2D but it doesn't rotate to size. While it works fine using ctx.rotate().
const ctx = document.body.appendChild(document.createElement('canvas')).getContext('2d')...
- 105
2
votes
1
answer
152
views
How can I change the size of the canvas gradient? [duplicate]
I want to scale the gradient without changing its container.
For example, apply scale or rotate on the created gradient object.
const ctx = document.body.appendChild(document.createElement('canvas'...
- 105
0
votes
1
answer
81
views
Gradient notworking after use path2D [duplicate]
I have a shape whose fillStyle is displayed by ctx.createLinearGradient.
I used to use ctx.beginPath and ctx.transform, and it worked fine.
But I want to do it with path2D, everything works fine but ...
- 105
3
votes
1
answer
106
views
How to create a 2D array in Javascript
I'm trying to create a 2D array with javascript that I can ultimately put inside a nested loop to extract X/Y information.
What am I doing wrong here?
function createMatrix(){
let colcount = 0;
...
- 35
0
votes
2
answers
182
views
8x8 div matrix onclick effectivization
I would like to have an 8x8 matrix where I can click on each square and the color will change, for use in a project.
I have made a 2d array and the entire 8x8 "board" but now I want to change to ...
- 1
0
votes
0
answers
69
views
In SVG is it possible to push/pop matrix transforms?
I am using SVG for an drawing app. I have a background in 3D graphics and one thing I see missing is the ability to push and pop matrix transforms.
How is this essential task handled in SVG?
- 12.9k
0
votes
4
answers
3k
views
Shifting rows and columns in 2D arrays - Javascript
I have a situation as such:
var array = [
[1,2,3],
[4,5,6],
[7,8,9]
]
And I am trying to create a function that shifts either a row or a column so the result would be:
shiftRow(array, 1)
[
...
0
votes
0
answers
484
views
Matrix/2D Array Hourglass Array Elements Giving Undefined
Facing an issue with array elements. In the case below, the problem set is as follows:
Actually, there are many hourglasses in the array above. An hourglass looks like so:
1 1 1
1
...
- 105
4
votes
1
answer
274
views
Documentation of HTML canvas 2D transformations using SVGMatrix
I'm looking at using an HTML canvas element for a simple game, but have had trouble finding complete documentation of certain features regarding the 2D drawing context. Usually I would look at MDN, ...
- 4,041
1
vote
1
answer
694
views
Moving a sprite in 2D matrix array - JavaScript
I have created a 2D array which contains a 10 x 10 maze. The problem I am having now is how I will move the sprite on the maze jpg (when it's actually working on the table).
How would I move the ...
- 87
3
votes
1
answer
984
views
how to rotate a shape using rotation matrix?
i'm trying to rotate a square in canvas by javascript using rotation matrix.
here is my code.
function square() {
this.cord=[[0,0],[-25,25],[25,25],[25,-25],[-25,-25]];
}
var a=new ...
user2199897
1
vote
0
answers
414
views
Visibility of Vector3 - 3D to 2D projection
I already asked this question over there:
https://github.com/mrdoob/three.js/issues/2070#issuecomment-6372113
But I did not really get it right now.
Here is my problem again:
i am using this function ...
- 1,670