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/**
* Copyright 2010-2023 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.graph.font;
/**
* Simple static font scale methods for unit conversions.
*
* PostScript - current DTP point system used e.g in CSS (Cascading Style Sheets).
* - 1 point = 1pt = 1/72in (cala) = 0.3528 mm
* - 1 pica = 1pc = 12pt= 1/6in (cala) = 4.233(3) mm
*/
public class FontScale {
/**
* Converts the the given points size to inch, dividing by {@code 72} points per inch.
* <pre>
1 points = 1/72 inch
*
* </pre>
*/
public static float ptToInch(final float points) {
return points / 72f /* points per inch */;
}
/**
* Converts the the given points size to mm, dividing by {@code 72 * 25.4} points per inch.
* <pre>
1 inch = 25.4 mm
1 points = 1/72 inch
1 points = 1/72 * 25.4 mm
*
* </pre>
*/
public static float ptToMM(final float points) {
return points / 72f /* points per inch */ * 25.4f /* mm_per_inch */;
}
/**
* Converts typical font size in points and screen resolution in dpi (pixels-per-inch) to font size in pixels,
* which can be used for pixel-size font scaling operations.
* <pre>
Font Scale Formula:
1 points = 1/72 inch
pixels = points / 72 * res_dpi
* </pre>
* @param points in points
* @param res_dpi display resolution in pixels-per-inch
* @return pixelSize scale factor for font operations.
* @see #toPixels2(float, float)
*/
public static float toPixels(final float points /* points */, final float res_dpi /* pixels per inch */) {
return ptToInch( points ) * res_dpi;
}
/**
* Converts typical font size in points and screen resolution in pixels (pixels-per-mm) to font size in pixels,
* which can be used for pixel-size font scaling operations.
* <pre>
Font Scale Formula:
1 inch = 25.4 mm
1 points = 1/72 inch
1 points = 1/72 * 25.4 mm
pixels = points / 72 * 25.4 * res_ppmm
* </pre>
* @param points in points
* @param res_ppmm display resolution in pixels-per-mm
* @return pixelSize scale factor for font operations.
* @see #toPixels(float, float)
*/
public static float toPixels2(final float points /* points */, final float res_ppmm /* pixels per mm */) {
return ptToMM( points ) * res_ppmm;
}
/**
* Converts [1/mm] to [1/inch] in place
* @param ppmm float[2] [1/mm] value
* @return return [1/inch] value
*/
public static float[/*2*/] ppmmToPPI(final float[/*2*/] ppmm) {
ppmm[0] *= 25.4f;
ppmm[1] *= 25.4f;
return ppmm;
}
/**
* Converts [1/mm] to [1/inch] into res storage
* @param ppmm float[2] [1/mm] value
* @param res the float[2] result storage
* @return return [1/inch] value, i.e. the given res storage
*/
public static float[/*2*/] ppmmToPPI(final float[/*2*/] ppmm, final float[/*2*/] res) {
res[0] = ppmm[0] * 25.4f;
res[1] = ppmm[1] * 25.4f;
return res;
}
/**
* Converts [1/inch] to [1/mm] in place
* @param ppi float[2] [1/inch] value
* @return return [1/mm] value
*/
public static float[/*2*/] ppiToPPMM(final float[/*2*/] ppi) {
ppi[0] /= 25.4f;
ppi[1] /= 25.4f;
return ppi;
}
/**
* Converts [1/inch] to [1/mm] into res storage
* @param ppi float[2] [1/inch] value
* @param res the float[2] result storage
* @return return [1/mm] value, i.e. the given res storage
*/
public static float[/*2*/] ppiToPPMM(final float[/*2*/] ppi, final float[/*2*/] res) {
res[0] = ppi[0] / 25.4f;
res[1] = ppi[1] / 25.4f;
return res;
}
}
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