JavaScript context translate doesnt work in electron

I am using ctx.translate(x, y) to move Camera in canvas game. But for some reason, that doesn't work.

This is what I am using:

setCameraPos: function(x, y) {

        //ctx.save()

        ctx.translate(x, y)

        ctx.setTransform(1, 0, 0, 1, 0, 0)

        //ctx.restore()

}

It doesn't work at all. It does not change position of camera.
Any errors? No errors at all.
I am using Electron 3.0.3 Beta.

I accept any libraries.

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

4

It would be useful if you would show an example with actual canvas content, and describe what you mean with "It doesn't work".
– trincot
Nov 19 '18 at 13:32

Changed it. Thanks for pointing it out.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:38

The setTransform overwrites any previous transforms, like translate
– Blindman67
Nov 19 '18 at 13:47

Please note that all the transformations are effective on future draw operations and not on past ones
– axelduch
Nov 19 '18 at 13:47

add a comment |

I am using ctx.translate(x, y) to move Camera in canvas game. But for some reason, that doesn't work.

This is what I am using:

setCameraPos: function(x, y) {

        //ctx.save()

        ctx.translate(x, y)

        ctx.setTransform(1, 0, 0, 1, 0, 0)

        //ctx.restore()

}

It doesn't work at all. It does not change position of camera.
Any errors? No errors at all.
I am using Electron 3.0.3 Beta.

I accept any libraries.

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

4

It would be useful if you would show an example with actual canvas content, and describe what you mean with "It doesn't work".
– trincot
Nov 19 '18 at 13:32

Changed it. Thanks for pointing it out.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:38

The setTransform overwrites any previous transforms, like translate
– Blindman67
Nov 19 '18 at 13:47

Please note that all the transformations are effective on future draw operations and not on past ones
– axelduch
Nov 19 '18 at 13:47

add a comment |

I am using ctx.translate(x, y) to move Camera in canvas game. But for some reason, that doesn't work.

This is what I am using:

setCameraPos: function(x, y) {

        //ctx.save()

        ctx.translate(x, y)

        ctx.setTransform(1, 0, 0, 1, 0, 0)

        //ctx.restore()

}

It doesn't work at all. It does not change position of camera.
Any errors? No errors at all.
I am using Electron 3.0.3 Beta.

I accept any libraries.

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

I am using ctx.translate(x, y) to move Camera in canvas game. But for some reason, that doesn't work.

This is what I am using:

setCameraPos: function(x, y) {

        //ctx.save()

        ctx.translate(x, y)

        ctx.setTransform(1, 0, 0, 1, 0, 0)

        //ctx.restore()

}

It doesn't work at all. It does not change position of camera.
Any errors? No errors at all.
I am using Electron 3.0.3 Beta.

I accept any libraries.

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

const canvas = document.getElementById('main')

const ctx = canvas.getContext('2d')





ctx.fillStyle = 'red'

ctx.fillRect(0, 0, 30, 30)

// This doesn't work | VVV

ctx.translate(20, 20)

ctx.setTransform(1, 0, 0, 1, 0, 0)

#main {

  background-color: black;

}

<canvas id="main">



</canvas>

javascript node.js canvas html5-canvas electron

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

edited Nov 19 '18 at 13:34

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

asked Nov 19 '18 at 13:30

Mr.DeleteMyMessages

13718

4

It would be useful if you would show an example with actual canvas content, and describe what you mean with "It doesn't work".
– trincot
Nov 19 '18 at 13:32

Changed it. Thanks for pointing it out.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:38

The setTransform overwrites any previous transforms, like translate
– Blindman67
Nov 19 '18 at 13:47

Please note that all the transformations are effective on future draw operations and not on past ones
– axelduch
Nov 19 '18 at 13:47

add a comment |

4

It would be useful if you would show an example with actual canvas content, and describe what you mean with "It doesn't work".
– trincot
Nov 19 '18 at 13:32

Changed it. Thanks for pointing it out.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:38

The setTransform overwrites any previous transforms, like translate
– Blindman67
Nov 19 '18 at 13:47

Please note that all the transformations are effective on future draw operations and not on past ones
– axelduch
Nov 19 '18 at 13:47

It would be useful if you would show an example with actual canvas content, and describe what you mean with "It doesn't work".
– trincot
Nov 19 '18 at 13:32

Changed it. Thanks for pointing it out.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:38

The setTransform overwrites any previous transforms, like translate
– Blindman67
Nov 19 '18 at 13:47

Please note that all the transformations are effective on future draw operations and not on past ones
– axelduch
Nov 19 '18 at 13:47

add a comment |

1 Answer
1

active

oldest

votes

From what you gave, the translate operation won't work anywhere, not just in Electron.

ctx.setTransform() method sets the transformation matrix to absolute values, the current matrix is discarded and the passed values are the ones to which your matrix will get set.
1, 0, 0, 1, 0, 0 are the values of the native matrix transform (i.e untransformed).

So calling ctx.setTransform(1, 0, 0, 1, 0, 0) will reset your tranform matrix to its default and make all calls to relative translate(), rotate() or transform() useless.

These methods are meant to be relative because they add up to the current matrix values. For instance,

ctx.translate(10, 10);

// here next drawing will be offset by 10px in both x and y direction

ctx.translate(40, -10);

// this adds up to the current 10, 10, so we are now offset by 30, 0

If you want your translate to work, don't call setTransform here, or even replace it with setTransform(1, 0, 0, 1, 20, 20)

Also, in your snippet, you are setting the transformation matrix after you did draw. The transformations will get applied only on next drawings, not on previous ones.

Now, you might be in an animation loop, and need your matrix to get reset at every loop.
In this case, call ctx.setTransform(1,0,0,1,0,0) either at the beginning of your drawing loop, either as the last op, and call translate() before drawing.

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

add a comment |

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1 Answer
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From what you gave, the translate operation won't work anywhere, not just in Electron.

So calling ctx.setTransform(1, 0, 0, 1, 0, 0) will reset your tranform matrix to its default and make all calls to relative translate(), rotate() or transform() useless.

These methods are meant to be relative because they add up to the current matrix values. For instance,

ctx.translate(10, 10);

// here next drawing will be offset by 10px in both x and y direction

ctx.translate(40, -10);

// this adds up to the current 10, 10, so we are now offset by 30, 0

If you want your translate to work, don't call setTransform here, or even replace it with setTransform(1, 0, 0, 1, 20, 20)

Also, in your snippet, you are setting the transformation matrix after you did draw. The transformations will get applied only on next drawings, not on previous ones.

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

add a comment |

From what you gave, the translate operation won't work anywhere, not just in Electron.

So calling ctx.setTransform(1, 0, 0, 1, 0, 0) will reset your tranform matrix to its default and make all calls to relative translate(), rotate() or transform() useless.

These methods are meant to be relative because they add up to the current matrix values. For instance,

ctx.translate(10, 10);

// here next drawing will be offset by 10px in both x and y direction

ctx.translate(40, -10);

// this adds up to the current 10, 10, so we are now offset by 30, 0

If you want your translate to work, don't call setTransform here, or even replace it with setTransform(1, 0, 0, 1, 20, 20)

Also, in your snippet, you are setting the transformation matrix after you did draw. The transformations will get applied only on next drawings, not on previous ones.

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

add a comment |

From what you gave, the translate operation won't work anywhere, not just in Electron.

So calling ctx.setTransform(1, 0, 0, 1, 0, 0) will reset your tranform matrix to its default and make all calls to relative translate(), rotate() or transform() useless.

These methods are meant to be relative because they add up to the current matrix values. For instance,

ctx.translate(10, 10);

// here next drawing will be offset by 10px in both x and y direction

ctx.translate(40, -10);

// this adds up to the current 10, 10, so we are now offset by 30, 0

If you want your translate to work, don't call setTransform here, or even replace it with setTransform(1, 0, 0, 1, 20, 20)

Also, in your snippet, you are setting the transformation matrix after you did draw. The transformations will get applied only on next drawings, not on previous ones.

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

From what you gave, the translate operation won't work anywhere, not just in Electron.

So calling ctx.setTransform(1, 0, 0, 1, 0, 0) will reset your tranform matrix to its default and make all calls to relative translate(), rotate() or transform() useless.

These methods are meant to be relative because they add up to the current matrix values. For instance,

ctx.translate(10, 10);

// here next drawing will be offset by 10px in both x and y direction

ctx.translate(40, -10);

// this adds up to the current 10, 10, so we are now offset by 30, 0

If you want your translate to work, don't call setTransform here, or even replace it with setTransform(1, 0, 0, 1, 20, 20)

Also, in your snippet, you are setting the transformation matrix after you did draw. The transformations will get applied only on next drawings, not on previous ones.

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

const canvas = document.getElementById('main');

const ctx = canvas.getContext('2d');

let x = 0;

ctx.fillStyle = 'red'

anim();



function draw() {

  // reset the matrix so we can clear everything

  ctx.setTransform(1, 0, 0, 1, 0, 0);

  ctx.clearRect(0, 0, canvas.width, canvas.height);

  //set the transform before drawing

  ctx.translate(x - 30, 20)

  //which is actually the same as 

  //ctx.setTransform(1, 0, 0, 1, x, 20);

  ctx.fillRect(0, 0, 30, 30);

}

function anim() {

  x = (x + 2) % (canvas.width + 60);

  draw();

  requestAnimationFrame(anim);

}

#main {

  background-color: black;

}

<canvas id="main"></canvas>

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

edited Nov 19 '18 at 14:15

answered Nov 19 '18 at 13:38

Kaiido

39k45799

answered Nov 19 '18 at 13:38

Kaiido

39k45799

answered Nov 19 '18 at 13:38

Kaiido

39k45799

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

add a comment |

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

But removing ctx.setTransform glitches canvas.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:41

@Mr.DeleteMyMessages What do you mean? There is no reason you get any glitches, also, since your edit I saw you were drawing before setting the matrix-transform, feels like your question misses some important clues...
– Kaiido
Nov 19 '18 at 13:45

Everytime you do ctx.transform it adds value a to x and value b to y.
– Mr.DeleteMyMessages
Nov 19 '18 at 13:53

yes ctx.transform is "relative", it adds to the current value, setTransform is "absolute" it sets to this value.
– Kaiido
Nov 19 '18 at 14:04

I made it setTransform before and it worked now.
– Mr.DeleteMyMessages
Nov 19 '18 at 14:10

add a comment |

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