From 23cd86a2e3e0b93779df1b0615c67f486ecf1c96 Mon Sep 17 00:00:00 2001
From: Ad5001 <mail@ad5001.eu>
Date: Sat, 5 Mar 2022 18:19:20 +0100
Subject: [PATCH] Starting latex rendering

---
 LogarithmPlotter/logarithmplotter.py          |  2 +
 .../LogarithmPlotter/Setting/ListSetting.qml  | 18 ++++++
 LogarithmPlotter/util/latex.py                | 58 +++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 LogarithmPlotter/util/latex.py

diff --git a/LogarithmPlotter/logarithmplotter.py b/LogarithmPlotter/logarithmplotter.py
index 53b29e0..6a3cc9d 100644
--- a/LogarithmPlotter/logarithmplotter.py
+++ b/LogarithmPlotter/logarithmplotter.py
@@ -46,6 +46,7 @@ from LogarithmPlotter import __VERSION__
 from LogarithmPlotter.util import config, native
 from LogarithmPlotter.util.update import check_for_updates
 from LogarithmPlotter.util.helper import Helper
+from LogarithmPlotter.util.latex import Latex
 
 config.init()
 
@@ -107,6 +108,7 @@ def run():
     engine = QQmlApplicationEngine()
     global tmpfile
     helper = Helper(pwd, tmpfile)
+    latex = Latex(tempdir, app.palette())
     engine.rootContext().setContextProperty("Helper", helper)
     engine.rootContext().setContextProperty("TestBuild", "--test-build" in argv)
     engine.rootContext().setContextProperty("StartTime", dep_time)
diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/ListSetting.qml b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/ListSetting.qml
index 718181f..c71fddd 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/ListSetting.qml
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/Setting/ListSetting.qml
@@ -1,3 +1,21 @@
+/**
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2022  Ad5001
+ * 
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import QtQuick 2.12
 import QtQuick.Controls 2.12
 import QtQml.Models 2.12
diff --git a/LogarithmPlotter/util/latex.py b/LogarithmPlotter/util/latex.py
new file mode 100644
index 0000000..943edfc
--- /dev/null
+++ b/LogarithmPlotter/util/latex.py
@@ -0,0 +1,58 @@
+"""
+ *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and distribution functions.
+ *  Copyright (C) 2022  Ad5001
+ * 
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+from PySide2.QtCore import QObject, Slot
+from PySide2.QtGui import QImage, QColor
+from PySide2.QtWidgets import QApplication
+
+from os import path
+from sympy import preview
+from tempfile import TemporaryDirectory
+
+class Latex(QObject):
+    def __init__(self, tempdir: str, palette):
+        QObject.__init__(self)
+        self.tempdir = tempdir
+        self.palette = palette
+        fg = self.palette.windowText().color().convertTo(QColor.Rgb)
+        
+    @Slot(str, float, bool, result=str)
+    def render(self, latexstring, font_size, themeFg = True):
+        exprpath = path.join(self.tempdir.name, str(hash(latexstring)) + '.png')
+        print(latexstring, exprpath)
+        if not path.exists(exprpath):
+            if themeFg:
+                fg = self.palette.windowText().color().convertTo(QColor.Rgb)
+                fg = f'rgb {fg.redF()} {fg.greenF()} {fg.blueF()}'
+            else:
+                fg = 'rgb 1.0 1.0 1.0'
+            preview('$$' + latexstring + '$$', viewer='file', filename=exprpath, dvioptions=[
+                "-T", "tight", 
+                "-z", "0", 
+                "--truecolor", 
+                f"-D {font_size * 72.27 / 10}", # See https://linux.die.net/man/1/dvipng#-D for convertion
+                "-bg", "Transparent", 
+                "-fg", fg],
+            euler=False)
+        return exprpath
+    
+    @Slot(str)
+    def copyLatexImageToClipboard(self, latexstring):
+        global tempfile
+        clipboard = QApplication.clipboard()
+        clipboard.setImage(QImage(self.render(latexstring)))