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POHow do I specify font height at different orientations?
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  1. POHow do I specify font height at different orientations?
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    copied!<p>The common way to create a font with GDI is to use the desired point size and the target device's vertical resolution (DPI) like this:</p> <pre><code>LOGFONT lf = {0}; lf.lfHeight = -MulDiv(point_size, GetDeviceCaps(hdc, LOGPIXELSY), 72); ... HFONT hfont = CreateFontIndirect(&amp;lf); </code></pre> <p>Assuming the default <code>MM_TEXT</code> mapping mode, this converts point_size into the pixel height for the desired device. (This is a common approximation. There are actually 72.27 points in an inch, not 72.) (The minus sign means I want to specify the actual character height, not the cell height.)</p> <p>If I want to create a sideways font--that is, one with an orientation and escapement of 90 degrees--do I use <code>LOGPIXELSX</code> rather than <code>LOGPIXELSY</code>? For some of the printers I'm targeting, the horizontal and vertical resolutions are different.</p> <p>Generally, if I want an angle of <code>theta</code>, do I combine <code>LOGPIXELSX</code> and <code>LOGPIXELSY</code>? I'm thinking of something like this:</p> <pre><code>// Given theta in degrees (e.g., theta = 45.0) ... double theta_radians = theta * 2.0 * pi / 360.0; int dpi = static_cast&lt;int&gt;(GetDeviceCaps(hdc, LOGPIXELSX) * sin(theta_radians) + GetDeviceCaps(hdc, LOGPIXELSY) * cos(theta_radians) + 0.5); LOGFONT lf = {0}; lf.lfHeight = -MulDiv(point_size, dpi, 72); // Set escapement and orientation to theta in tenths of a degree. lf.lfEscapement = lf.lfOrientation = static_cast&lt;LONG&gt;(theta * 10.0 + 0.5); ... </code></pre> <p>This makes intuitive sense to me, but I'm wondering if this is really how the GDI font mapper and printer drivers work.</p>
 

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