dorkbox.util.FontUtil.kt Maven / Gradle / Ivy
/*
* Copyright 2023 dorkbox, llc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dorkbox.util
import dorkbox.os.OS.getProperty
import java.awt.*
import java.awt.image.BufferedImage
import java.io.IOException
import java.io.InputStream
import java.net.URISyntaxException
/**
* Java Font utilities
*/
@Suppress("unused")
object FontUtil {
/** Default location where all the fonts are stored */
@Volatile
var FONTS_LOCATION = getProperty(FontUtil::class.java.canonicalName + ".FONTS_LOCATION", "resources/fonts")
/** All of the fonts in the [.FONTS_LOCATION] will be loaded by the Font manager */
fun loadAllFonts() {
val ge = GraphicsEnvironment.getLocalGraphicsEnvironment()
val fonts = LocationResolver.getResources(FONTS_LOCATION) ?: return
if (fonts.hasMoreElements()) {
// skip the FIRST one, since we always know that the first one is the directory we asked for
fonts.nextElement()
while (fonts.hasMoreElements()) {
val url = fonts.nextElement()
var `is`: InputStream? = null
try {
val path = url.toURI().path
// only support TTF and OTF fonts (java 7+).
if (path.endsWith(".ttf") || path.endsWith(".otf")) {
`is` = url.openStream()
val newFont = Font.createFont(Font.TRUETYPE_FONT, `is`)
// fonts that ALREADY exist are not re-registered
ge.registerFont(newFont)
}
} catch (e: IOException) {
e.printStackTrace()
} catch (e: URISyntaxException) {
e.printStackTrace()
} catch (e: FontFormatException) {
e.printStackTrace()
} finally {
if (`is` != null) {
try {
`is`.close()
} catch (e: IOException) {
e.printStackTrace()
}
}
}
}
}
}
/**
* Gets (or creates) a Font based on a specific system property. Remember: the FontManager caches system/loaded fonts, so we don't need
* to ALSO cache them as well. see: https://stackoverflow.com/questions/6102602/java-awt-is-font-a-lightweight-object
*
*
* Also remember that if requesting a BOLD hint for a font, the system will look for a font that is BOLD. If none are found, it
* will then apply transforms to the specified font to create a font that is bold. Specifying a bold name AND a bold hint will not
* "double bold" the font
*
*
* For example:
*
*
*
* Font titleTextFont = FontUtil.parseFont("Source Code Pro Bold 16");
*
* @param fontInfo This is the font "name style size", as a string. For example "Source Code Pro Bold BOLD 16"
*
* @return the specified font
*/
fun parseFont(fontInfo: String): Font {
return try {
val sizeIndex = fontInfo.lastIndexOf(" ")
val size = fontInfo.substring(sizeIndex + 1)
// hint is at most 6 (ITALIC) before sizeIndex - we can use this to our benefit.
val styleIndex = fontInfo.indexOf(" ", sizeIndex - 7)
val styleString = fontInfo.substring(styleIndex + 1, sizeIndex)
var style = Font.PLAIN
if (styleString.equals("bold", ignoreCase = true)) {
style = Font.BOLD
} else if (styleString.equals("italic", ignoreCase = true)) {
style = Font.ITALIC
}
val fontName = fontInfo.substring(0, styleIndex)
// this can be WRONG, in which case it will just error out
Font(fontName, style, size.toInt())
} catch (e: Exception) {
throw RuntimeException("Unable to load font info from '$fontInfo'", e)
}
}
/**
* Gets the correct font for a specified pixel height. This measures the maximum font height possible for the specified font. This
* can be different than the alpha-numeric height.
*
* @param font the font we are checking
* @param height the height in pixels we want to get as close as possible to
*
* @return the font (derived from the specified font) that is as close as possible to the requested height. If our font-size is less
* than the height, then the approach is from the low size (so the returned font will always fit inside the box)
*/
fun getFontForSpecificHeight(font: Font, height: Int): Font {
var size = font.size
var lastAction: Boolean? = null
while (true) {
val fontCheck = Font(font.name, Font.PLAIN, size)
val maxFontHeight = getMaxFontHeight(fontCheck)
lastAction = if (maxFontHeight < height && lastAction !== java.lang.Boolean.FALSE) {
size++
java.lang.Boolean.TRUE
} else if (maxFontHeight > height && lastAction !== java.lang.Boolean.TRUE) {
size--
java.lang.Boolean.FALSE
} else {
// either we are the exact size, or we are ONE font size to big/small (depending on what our initial guess was)
return fontCheck
}
}
}
/**
* Gets the specified font height for a specific string, as rendered on the screen.
*
* @param font the font to use for rendering the string
* @param string the string used to get the height
*
* @return the height of the string
*/
fun getFontHeight(font: Font, string: String): Int {
val image = BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)
val g = image.createGraphics()
val frc = g.fontRenderContext
val gv = font.createGlyphVector(frc, string)
val height = gv.getPixelBounds(null, 0f, 0f).height
g.dispose()
return height
}
/**
* Gets the specified font width for a specific string, as rendered on the screen.
*
* @param font the font to use for rendering the string
* @param string the string used to get the width
*
* @return the width of the string
*/
fun getFontWidth(font: Font, string: String): Int {
val image = BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)
val g = image.createGraphics()
val frc = g.fontRenderContext
val gv = font.createGlyphVector(frc, string)
val width = gv.getPixelBounds(null, 0f, 0f).width
g.dispose()
return width
}
/**
* Gets the maximum font height used by alpha-numeric characters ONLY, as recorded by the font.
*/
fun getAlphaNumericFontHeight(font: Font): Int {
// Because font metrics is based on a graphics context, we need to create a small, temporary image to determine the width and height
val image = BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)
val g = image.createGraphics()
val metrics = g.getFontMetrics(font)
val height = metrics.ascent + metrics.descent
g.dispose()
return height
}
/**
* Gets the maximum font height used by of ALL characters, as recorded by the font.
*/
fun getMaxFontHeight(font: Font): Int {
// Because font metrics is based on a graphics context, we need to create a small, temporary image to determine the width and height
val image = BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)
val g = image.createGraphics()
val metrics = g.getFontMetrics(font)
val height = metrics.maxAscent + metrics.maxDescent
g.dispose()
return height
}
/**
* Gets the specified text (with a font) and as an image
*
* @param font the specified font to render the image
* @return a BufferedImage of the specified text, font, and color
*/
fun getFontAsImage(font: Font, text: String, foregroundColor: Color): BufferedImage {
// Because font metrics is based on a graphics context, we need to create a small, temporary image to determine the width and height
var img = BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB)
var g2d = img.createGraphics()
g2d.font = font
var fm = g2d.fontMetrics
var width = fm.stringWidth(text)
var height = fm.height
g2d.dispose()
// make it square
if (width > height) {
height = width
} else {
width = height
}
img = BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB)
g2d = img.createGraphics()
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY)
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON)
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY)
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE)
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON)
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR)
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY)
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE)
g2d.font = font
fm = g2d.fontMetrics
g2d.color = foregroundColor
// width/4 centers the text in the image
g2d.drawString(text, width / 4.0f, fm.ascent.toFloat())
g2d.dispose()
return img
}
}
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