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How to change the coordinates of a text in a pdf page from lower left to upper left


How to change the coordinates of a text in a pdf page from lower left to upper left

By : user2956836
Date : November 22 2020, 03:03 PM
Hope this helps The coordinate system in PDF is defined in ISO-32000-1. This ISO standard explains that the X-axis is oriented towards the right, whereas the Y-axis has an upward orientation. This is the default. These are the coordinates that are returned by iText (behind the scenes, iText resolves all CTM transformations).
If you want to transform the coordinates returned by iText so that you get coordinates in a coordinate system where the Y axis has a downward orientation, you could for instance subtract the Y value returned by iText from the Y-coordinate of the top of the page.
code :
y = 842 - y;


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Get map position when WGS-84 lat/lon when upper left and lower right corners' lat/lon are given

Get map position when WGS-84 lat/lon when upper left and lower right corners' lat/lon are given


By : Vijayakumar Chandras
Date : March 29 2020, 07:55 AM
seems to work fine If the map is roughly street/city level, uses a mercator projection (as openstreetmap.org seems to), and isn't too close to the poles, linear interpolation may be accurate enough. Assuming the following:
TL = lat/lon of top left corner BR = lat/lon of bottom right corner P = lat/lon of the point you want to locate on the map (w,h) = width and height of the map you have (pixels?) the origin of the map image, (0,0), is at its top-left corner
code :
x = w * (P.lon - TL.lon) / (BR.lon - TL.lon)
y = h * (P.lat - TL.lat) / (BR.lat - TL.lat)
Y = k * ln((1 + sin(P.lat)) / (1 - sin(P.lat)))
k = h / (ln((1 + sin(TL.lat)) / (1 - sin(TL.lat))) - ln((1 + sin(BR.lat)) / (1 - sin(BR.lat))))
Y(TL.lat) = k * ln((1 + sin(TL.lat)) / (1 - sin(TL.lat)))
Y(P.lat)  = k * ln((1 + sin(P.lat )) / (1 - sin(P.lat )))
y(P.lat)  = -(Y(P.lat) - Y(TL.lat))
x = w * (P.lon - TL.lon) / (BR.lon - TL.lon) // like before
y = -(Y(P.lat) - Y(TL.lat))                  // where Y(anything) depends just on h, TL.lat and BR.lat 
How do you determine the upper-left coordinates of a rectangle based on the center coordinates?

How do you determine the upper-left coordinates of a rectangle based on the center coordinates?


By : Turbowolf
Date : March 29 2020, 07:55 AM
Any of those help If center is (x,y) width = w height = h
Assuming the rectangle is sitting flat relative to the coordinate plane, the upper left corner is exactly (x-w/2, y-h/2).
Set mouse over image from upper left to lower right

Set mouse over image from upper left to lower right


By : Quoc Phu Dang
Date : March 29 2020, 07:55 AM
this will help http://jsfiddle.net/8GVFC/2/
code :
$(document).ready(function(){
$("#image").mousemove(function(e) {
    $("#pop-up").fadeIn(0);
    $("#pop-up").offset({
        top: e.pageY+20, // Approximate mouse height: 20
        left: e.pageX+15 // Approximate mouse width: 15
    });
}).mouseleave(function() {
    $("#pop-up").fadeOut(250);
                     });                                             
});
If Metal origin is upper left corner, why does this image show it on the lower left?

If Metal origin is upper left corner, why does this image show it on the lower left?


By : user3535442
Date : March 29 2020, 07:55 AM
will be helpful for those in need Core Image uses a coordinate system whose origin is in the bottom-left of the image. Although you might suspect that it would account for Metal's top-left origin when wrapping a MTLTexture, it appears this is not the case.
To create a CIImage whose orientation matches that of the original texture, you can request a new image that has been vertically flipped:
code :
image = image.transformed(by: image.orientationTransform(for: .downMirrored))
How to stop a header and lower text from flowing around an upper left-floated img element

How to stop a header and lower text from flowing around an upper left-floated img element


By : Feroz Ahmed
Date : March 29 2020, 07:55 AM
I wish this helpful for you Suppose the order of the layout like so: , Add clear:both to your h3
code :
h3 {clear:both;}
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