Calculate rectangle position after scaling from his center
$begingroup$
I have a rectangle with these bounds
height: 31.010414123535156
width: 215.8330078125
x: 10.95849609375
y: 90.49478912353516
I want to scale up the rectangle by a 0.541667 factor.
X, Y coordinates are coordinates of the top left corner.
I know that the scale origin is the center of the rectangle.
To find the width and height I simply did this calculate
newWidth = width / 0.541667
newHeight = height / 0.541667
But I can't figure out how to calculate the new x and y coordinates.
Which gives me these bounds
height: 57.25
width: 398.4609375
x: -80.35546875 //how to find this value ?
y: 77.375 //how to find this value ?
geometry transformation
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
$endgroup$
add a comment |
$begingroup$
I have a rectangle with these bounds
height: 31.010414123535156
width: 215.8330078125
x: 10.95849609375
y: 90.49478912353516
I want to scale up the rectangle by a 0.541667 factor.
X, Y coordinates are coordinates of the top left corner.
I know that the scale origin is the center of the rectangle.
To find the width and height I simply did this calculate
newWidth = width / 0.541667
newHeight = height / 0.541667
But I can't figure out how to calculate the new x and y coordinates.
Which gives me these bounds
height: 57.25
width: 398.4609375
x: -80.35546875 //how to find this value ?
y: 77.375 //how to find this value ?
geometry transformation
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
$endgroup$
add a comment |
$begingroup$
I have a rectangle with these bounds
height: 31.010414123535156
width: 215.8330078125
x: 10.95849609375
y: 90.49478912353516
I want to scale up the rectangle by a 0.541667 factor.
X, Y coordinates are coordinates of the top left corner.
I know that the scale origin is the center of the rectangle.
To find the width and height I simply did this calculate
newWidth = width / 0.541667
newHeight = height / 0.541667
But I can't figure out how to calculate the new x and y coordinates.
Which gives me these bounds
height: 57.25
width: 398.4609375
x: -80.35546875 //how to find this value ?
y: 77.375 //how to find this value ?
geometry transformation
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
$endgroup$
I have a rectangle with these bounds
height: 31.010414123535156
width: 215.8330078125
x: 10.95849609375
y: 90.49478912353516
I want to scale up the rectangle by a 0.541667 factor.
X, Y coordinates are coordinates of the top left corner.
I know that the scale origin is the center of the rectangle.
To find the width and height I simply did this calculate
newWidth = width / 0.541667
newHeight = height / 0.541667
But I can't figure out how to calculate the new x and y coordinates.
Which gives me these bounds
height: 57.25
width: 398.4609375
x: -80.35546875 //how to find this value ?
y: 77.375 //how to find this value ?
geometry transformation
geometry transformation
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
edited Dec 29 '18 at 9:49
zaarr78
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
asked Dec 29 '18 at 9:21
zaarr78zaarr78
32
32
add a comment |
add a comment |
1 Answer
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$begingroup$
Your results make sense only if your $x$-axis goes from left to right, $y$-axis goes from top to bottom and $(x,y)$ denotes the coordinate of the top left corner of the rectangle. Such coordinate system is typically used for computer screens. In that case:
newX = x + width/2 - newWidth/2
newY = y + height/2 - newHeight/2
Check your values and you'll see that the numbers match.
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
$endgroup$
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Your results make sense only if your $x$-axis goes from left to right, $y$-axis goes from top to bottom and $(x,y)$ denotes the coordinate of the top left corner of the rectangle. Such coordinate system is typically used for computer screens. In that case:
newX = x + width/2 - newWidth/2
newY = y + height/2 - newHeight/2
Check your values and you'll see that the numbers match.
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
$endgroup$
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
add a comment |
$begingroup$
Your results make sense only if your $x$-axis goes from left to right, $y$-axis goes from top to bottom and $(x,y)$ denotes the coordinate of the top left corner of the rectangle. Such coordinate system is typically used for computer screens. In that case:
newX = x + width/2 - newWidth/2
newY = y + height/2 - newHeight/2
Check your values and you'll see that the numbers match.
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
$endgroup$
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
add a comment |
$begingroup$
Your results make sense only if your $x$-axis goes from left to right, $y$-axis goes from top to bottom and $(x,y)$ denotes the coordinate of the top left corner of the rectangle. Such coordinate system is typically used for computer screens. In that case:
newX = x + width/2 - newWidth/2
newY = y + height/2 - newHeight/2
Check your values and you'll see that the numbers match.
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
$endgroup$
Your results make sense only if your $x$-axis goes from left to right, $y$-axis goes from top to bottom and $(x,y)$ denotes the coordinate of the top left corner of the rectangle. Such coordinate system is typically used for computer screens. In that case:
newX = x + width/2 - newWidth/2
newY = y + height/2 - newHeight/2
Check your values and you'll see that the numbers match.
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
edited Dec 29 '18 at 10:04
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
answered Dec 29 '18 at 9:28
OldboyOldboy
9,54911138
9,54911138
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
add a comment |
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
$begingroup$
X, Y coordinates are top left corner I updated my question
$endgroup$
– zaarr78
Dec 29 '18 at 9:49
add a comment |
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