centring the canvas moves it in the corner

I am trying to centre my whole canvas in the middle so I can scale it, as the edges are not complete and I can't fill up the space using values lower or bigger than the canvas as it bring up errors. Here is a picture without scaling and with scaling.

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

  createCanvas(600, 600);

  colorMode(HSB, 100, 100, 100);

  noStroke();

  rectMode(CENTER);

}



function draw() {

  translate(width/2,height/2);

  if (timesDrawed >= 3) {

    noLoop();

  } else {

    timesDrawed++;

  }

  scale(1.2);

  for (var r = 0; r < rows; r++) {

    for (var c = 0; c < cols; c++) {

      var tempX = random((width / (cols)) * c - (width / cols * 0.5), (width / (cols)) * c + (width / cols * 0.5));

      var tempY = random((height / (rows)) * r - (height / rows * 0.5), (height / (rows)) * r + (height / rows * 0.5));

      points.push([tempX, tempY]);

    }

  }

  print(points);

  for (var r = 0; r < rows - 1; r++) {

    for (var c = 0; c < cols -1; c++) {

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows);

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows) + rows;

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows + 1;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

    }

  }

}

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

Did the answer solve the issue? Are there remaining questions?

– Rabbid76
Feb 10 at 10:38

add a comment |

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

  createCanvas(600, 600);

  colorMode(HSB, 100, 100, 100);

  noStroke();

  rectMode(CENTER);

}



function draw() {

  translate(width/2,height/2);

  if (timesDrawed >= 3) {

    noLoop();

  } else {

    timesDrawed++;

  }

  scale(1.2);

  for (var r = 0; r < rows; r++) {

    for (var c = 0; c < cols; c++) {

      var tempX = random((width / (cols)) * c - (width / cols * 0.5), (width / (cols)) * c + (width / cols * 0.5));

      var tempY = random((height / (rows)) * r - (height / rows * 0.5), (height / (rows)) * r + (height / rows * 0.5));

      points.push([tempX, tempY]);

    }

  }

  print(points);

  for (var r = 0; r < rows - 1; r++) {

    for (var c = 0; c < cols -1; c++) {

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows);

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows) + rows;

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows + 1;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

    }

  }

}

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

Did the answer solve the issue? Are there remaining questions?

– Rabbid76
Feb 10 at 10:38

add a comment |

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

  createCanvas(600, 600);

  colorMode(HSB, 100, 100, 100);

  noStroke();

  rectMode(CENTER);

}



function draw() {

  translate(width/2,height/2);

  if (timesDrawed >= 3) {

    noLoop();

  } else {

    timesDrawed++;

  }

  scale(1.2);

  for (var r = 0; r < rows; r++) {

    for (var c = 0; c < cols; c++) {

      var tempX = random((width / (cols)) * c - (width / cols * 0.5), (width / (cols)) * c + (width / cols * 0.5));

      var tempY = random((height / (rows)) * r - (height / rows * 0.5), (height / (rows)) * r + (height / rows * 0.5));

      points.push([tempX, tempY]);

    }

  }

  print(points);

  for (var r = 0; r < rows - 1; r++) {

    for (var c = 0; c < cols -1; c++) {

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows);

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows) + rows;

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows + 1;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

    }

  }

}

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

  createCanvas(600, 600);

  colorMode(HSB, 100, 100, 100);

  noStroke();

  rectMode(CENTER);

}



function draw() {

  translate(width/2,height/2);

  if (timesDrawed >= 3) {

    noLoop();

  } else {

    timesDrawed++;

  }

  scale(1.2);

  for (var r = 0; r < rows; r++) {

    for (var c = 0; c < cols; c++) {

      var tempX = random((width / (cols)) * c - (width / cols * 0.5), (width / (cols)) * c + (width / cols * 0.5));

      var tempY = random((height / (rows)) * r - (height / rows * 0.5), (height / (rows)) * r + (height / rows * 0.5));

      points.push([tempX, tempY]);

    }

  }

  print(points);

  for (var r = 0; r < rows - 1; r++) {

    for (var c = 0; c < cols -1; c++) {

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows);

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

      fill(random(0, 100), sat, bright);

      var point1 = c + (r * rows) + rows;

      var point2 = c + (r * rows) + 1;

      var point3 = c + (r * rows) + rows + 1;

      triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

    }

  }

}

javascript processing p5.js

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

asked Nov 25 '18 at 13:24

Tudor Popescu

16110

Did the answer solve the issue? Are there remaining questions?

– Rabbid76
Feb 10 at 10:38

add a comment |

Did the answer solve the issue? Are there remaining questions?

– Rabbid76
Feb 10 at 10:38

Did the answer solve the issue? Are there remaining questions?

– Rabbid76
Feb 10 at 10:38

add a comment |

1 Answer
1

active

oldest

votes

If the canvas is tiled in columns (cols) and rows rows, then the start of each column is c * width/cols and the end of each column is (c+1) * width/cols, the start of each row is (r * height/rowsand the end of each row is(r+1) * height/rows, wherecis the column andr` is the row.

Since the center of the canvas is (0, 0), the half with and the half height have to be subtracted from the coordinate:

var tempX = random(c * width/cols  - width/2,  (c+1) * width/cols  - width/2); 

var tempY = random(r * height/rows - height/2, (r+1) * height/rows - height/2);

var tempX = random(c, c+1) * width/cols  - width/2; 

var tempY = random(r, r+1) * height/rows - height/2;

See the preview, where I applied the suggested changes to your original code and I removed the scale ~~scale(1.2)~~:

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

add a comment |

Your Answer

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1 Answer
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Since the center of the canvas is (0, 0), the half with and the half height have to be subtracted from the coordinate:

var tempX = random(c * width/cols  - width/2,  (c+1) * width/cols  - width/2); 

var tempY = random(r * height/rows - height/2, (r+1) * height/rows - height/2);

var tempX = random(c, c+1) * width/cols  - width/2; 

var tempY = random(r, r+1) * height/rows - height/2;

See the preview, where I applied the suggested changes to your original code and I removed the scale ~~scale(1.2)~~:

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

add a comment |

Since the center of the canvas is (0, 0), the half with and the half height have to be subtracted from the coordinate:

var tempX = random(c * width/cols  - width/2,  (c+1) * width/cols  - width/2); 

var tempY = random(r * height/rows - height/2, (r+1) * height/rows - height/2);

var tempX = random(c, c+1) * width/cols  - width/2; 

var tempY = random(r, r+1) * height/rows - height/2;

See the preview, where I applied the suggested changes to your original code and I removed the scale ~~scale(1.2)~~:

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

add a comment |

Since the center of the canvas is (0, 0), the half with and the half height have to be subtracted from the coordinate:

var tempX = random(c * width/cols  - width/2,  (c+1) * width/cols  - width/2); 

var tempY = random(r * height/rows - height/2, (r+1) * height/rows - height/2);

var tempX = random(c, c+1) * width/cols  - width/2; 

var tempY = random(r, r+1) * height/rows - height/2;

See the preview, where I applied the suggested changes to your original code and I removed the scale ~~scale(1.2)~~:

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

Since the center of the canvas is (0, 0), the half with and the half height have to be subtracted from the coordinate:

var tempX = random(c * width/cols  - width/2,  (c+1) * width/cols  - width/2); 

var tempY = random(r * height/rows - height/2, (r+1) * height/rows - height/2);

var tempX = random(c, c+1) * width/cols  - width/2; 

var tempY = random(r, r+1) * height/rows - height/2;

See the preview, where I applied the suggested changes to your original code and I removed the scale ~~scale(1.2)~~:

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

var rows = 10;

var cols = 10;

var points = ;

var sat = 70;

var bright = 80;

var timesDrawed = 0;



function setup() {

    createCanvas(400, 400);

    colorMode(HSB, 100, 100, 100);

    noStroke();

    rectMode(CENTER);

}



function draw() {

    background(64);

    translate(width/2,height/2);

    if (timesDrawed >= 3) {

        noLoop();

    } else {

        timesDrawed++;

    }

    //scale(1.2);

    for (var r = 0; r < rows; r++) {

        for (var c = 0; c < cols; c++) {

            var tempX = random(c, c+1) * width/cols  - width/2; 

            var tempY = random(r, r+1) * height/rows - height/2; 

            points.push([tempX, tempY]);

        }

    }

    print(points);

    for (var r = 0; r < rows - 1; r++) {

        for (var c = 0; c < cols -1; c++) {

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows);

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

            fill(random(0, 100), sat, bright);

            var point1 = c + (r * rows) + rows;

            var point2 = c + (r * rows) + 1;

            var point3 = c + (r * rows) + rows + 1;

            triangle(points[point1][0], points[point1][1], points[point2][0], points[point2][1], points[point3][0], points[point3][1]);

        }

    }

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.1/p5.js"></script>

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

edited Nov 25 '18 at 16:47

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

answered Nov 25 '18 at 16:25

Rabbid76

39.8k123251

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