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-<?xml version="1.0" encoding="utf-8" ?>
-<!DOCTYPE chapter SYSTEM "chapter.dtd">
-
-<chapter>
- <header>
- <copyright>
- <year>2000</year><year>2016</year>
- <holder>Ericsson AB. All Rights Reserved.</holder>
- </copyright>
- <legalnotice>
- 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.
-
- </legalnotice>
-
- <title>Fonts</title>
- <prepared></prepared>
- <docno></docno>
- <date></date>
- <rev></rev>
- <file>gs_chapter5.xml</file>
- </header>
-
- <section>
- <title>The Font Model</title>
- <p>Text related objects can be handled with the font option <c><![CDATA[{font,Font}]]></c>. A <c><![CDATA[Font]]></c> is represented as a two or three tuple:</p>
- <list type="bulleted">
- <item><c><![CDATA[{Family,Size}]]></c></item>
- <item><c><![CDATA[{Family,Style,Size}]]></c></item>
- </list>
- <p>Examples of fonts are: <c><![CDATA[{times,12}]]></c>, <c><![CDATA[{symbol,bold,18}]]></c>, <c><![CDATA[{courier,[bold,italic],6}]]></c>, <c><![CDATA[{screen,12}]]></c>.</p>
- <p>The most important requirement with the font model is to ensure that there is always a "best possible" font present. For example, if an application tries to use the font <c><![CDATA[{times,17}]]></c> on a computer system which does not have this font available, the <c><![CDATA[gs]]></c> font model automatically substitutes <c><![CDATA[{times,16}]]></c>.</p>
- <p>Note that GS requires that the following fonts are available if using an X-server display:</p>
- <list type="bulleted">
- <item>fixed</item>
- <item>-*-courier-*</item>
- <item>-*-times-*</item>
- <item>-*-helvetica-*</item>
- <item>-*-symbol-*</item>
- <item>"-*-new century schoolbook-"</item>
- <item>-*-screen-*</item>
- </list>
- <p>To find out which font is actually chosen by the <c><![CDATA[gs]]></c>, use the option <c><![CDATA[{choose_font,Font}]]></c>. For example, the following situation might occur:</p>
- <pre><![CDATA[
-1> <input>G=gs:start().</input>
-{1,<0.20.0>}
-2><input>gs:read(G,{choose_font,{times,38}}).</input>
-{times,[],38}
-3> <input>gs:read(G,{choose_font,{screen,italic,6}}).</input>
-{courier,italic,6}
-4>
- ]]></pre>
- <p>When programming with fonts, it is often necessary to find the size of a string which uses a specific font. <c><![CDATA[{font_wh,Font}]]></c> returns the width and height of any string and any font. The following example illustrates its usage:</p>
- <marker id="gs_fig6"></marker>
- <image file="images/ex15.gif">
- <icaption>Font Examples</icaption>
- </image>
- <codeinclude file="examples/ex15.erl" tag="" type="erl"></codeinclude>
- </section>
-</chapter>
-