From bb633f3f8c3372acd069081d87e95724b15f1a93 Mon Sep 17 00:00:00 2001
From: wp_xxyyzz <wp_xxyyzz@8e941d3f-bd1b-0410-a28a-d453659cc2b4>
Date: Sun, 25 Jun 2017 16:29:53 +0000
Subject: [PATCH] chemtext: add readme.txt

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@5960 8e941d3f-bd1b-0410-a28a-d453659cc2b4
---
 components/chemtext/demo/runtime/project1.lpi |  3 ++
 components/chemtext/readme.txt                | 29 +++++++++++++++++++
 components/chemtext/source/chemtext.pas       | 14 ++++-----
 3 files changed, 38 insertions(+), 8 deletions(-)
 create mode 100644 components/chemtext/readme.txt

diff --git a/components/chemtext/demo/runtime/project1.lpi b/components/chemtext/demo/runtime/project1.lpi
index e1627a4a0..48bfc1299 100644
--- a/components/chemtext/demo/runtime/project1.lpi
+++ b/components/chemtext/demo/runtime/project1.lpi
@@ -57,6 +57,9 @@
       <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
     </SearchPaths>
     <Linking>
+      <Debugging>
+        <UseExternalDbgSyms Value="True"/>
+      </Debugging>
       <Options>
         <Win32>
           <GraphicApplication Value="True"/>
diff --git a/components/chemtext/readme.txt b/components/chemtext/readme.txt
new file mode 100644
index 000000000..08cf09497
--- /dev/null
+++ b/components/chemtext/readme.txt
@@ -0,0 +1,29 @@
+--------------------------------------------------------------------------------
+CHEMTEXT
+--------------------------------------------------------------------------------
+
+This library is intended to display chemical formulas and equations with 
+automatically placed subscripts and superscripts. 
+
+The procedure ChemTextOut draws the chemical text onto any canvas object 
+(useful for writing event handlers for user drawn lists and grids). 
+This procedure is used by the component TChemLabel to display chemical formulas 
+on the forms.
+
+The formulas are written in a straightforward way. The "2" in H2O is automatically
+subscripted, and the + in H+ is automatically displayed as superscript. Note
+that multiple-charge ions must repeat the charge sign, i.e. the double-negatively
+charged oxygon ion must be written as O--, not as O2-.
+
+For chemical reactions, arrows can be entered as -->, <-- or <-->. The property
+Arrow of the TChemLabel determines whether this simple is to be replaced by
+a nice UTF8 character.
+
+The code is based on "chemtxt" written by Patrick Spanel 
+(Patrik.Spanel@jh-inst.cas.cz). It was adapted to Lazarus and extended by 
+Werner Pamler.
+
+The code does not work under Delphi any more.
+
+License:
+LGPL with linking exception (the same license used by Lazarus).
diff --git a/components/chemtext/source/chemtext.pas b/components/chemtext/source/chemtext.pas
index 8b38a5ba8..c065bb6be 100644
--- a/components/chemtext/source/chemtext.pas
+++ b/components/chemtext/source/chemtext.pas
@@ -95,14 +95,12 @@ type
 { The following rotuines can be used in an event handler, for example in
   OnDrawDataCell of DBGrid:
 
-    procedure TForm1.DBGrid1DrawDataCell(Sender: TObject;
-              const Rect: TRect; Field: TField; State:
-              TGridDrawState);
-    begin
-      if Assigned(Field) then
-         ChemTextOut((Sender as TDBGrid).Canvas, Rect, Rect.Left,
-                     Rect.Top, Field.DisplayText);
-    end;
+  procedure TForm1.DBGrid1DrawDataCell(Sender: TObject; const Rect: TRect;
+    Field: TField; State: TGridDrawState);
+  begin
+    if Assigned(Field) then
+      ChemTextOut((Sender as TDBGrid).Canvas, Rect.Left, Rect.Top, Field.DisplayText);
+  end;
 }
 
 function ChemTextOut(ACanvas: TCanvas; X, Y: integer;