Added class JSDSlider by Dr.H.Reh.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10275 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/print/libprint/JSDSlider.h

@@ -0,0 +1,31 @@
+/*
+	JSDSlider.h
+	Dr.H.Reh
+	27.11.2004
+	
+	Based on source code from Be Inc. RIP
+	Copyright 1995 Be Incorporated, All Rights Reserved.
+*/
+
+#ifndef __JSD_SLIDER_H
+#define __JSD_SLIDER_H
+
+#include <Slider.h>
+#include <String.h>
+
+
+class JSDSlider : public BSlider 
+{
+public: 
+	JSDSlider(BRect frame, const char* name, const char *label, BMessage *msg, 
+				int32 min, int32 max, thumb_style t); 
+
+	~JSDSlider(); 
+  
+	char* UpdateText() const; 
+	
+private:
+	BString* fResult;	
+};
+
+#endif 

src/add-ons/print/drivers/shared/libprint/JSDSlider.cpp

@@ -0,0 +1,50 @@
+/*
+	JSDSlider.cpp
+	Dr.H.Reh
+	27.11.2004
+	
+	Based on source code from Be Inc. RIP
+	Copyright 1995 Be Incorporated, All Rights Reserved.
+*/
+
+#include "JSDSlider.h"
+
+#include <Window.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+JSDSlider :: JSDSlider(BRect frame, const char* name, const char *label, 
+               BMessage *msg, int32 min, int32 max, thumb_style t) 
+             : BSlider(frame, name, label, msg, min, max, t) 
+{ 
+	fResult = new BString();
+} 
+
+JSDSlider :: ~JSDSlider() 
+{ 
+	delete fResult;
+} 
+
+char* JSDSlider :: UpdateText() const 
+{
+//  When the slider's Draw method is called, this method 
+//  will also be called. If its return value is non-NULL, 
+//  then it will be drawn with the rest of the slider 
+	static char string[64];
+	string[0] = 0;
+		
+	if (!strcmp("gamma", Name()) ) {        
+		float gamma;
+		gamma =  exp((Value() * log(2.0) * 0.01) );    
+		sprintf(string, " %.2f", gamma); 
+	} else if (!strcmp("inkDensity", Name()) ) {        
+		float density;
+		density = 127 - Value();
+		sprintf(string," %.2f", density/127.0 ); 
+	}
+	
+	*fResult = string;
+	return (char *)fResult->String(); 
+} 

src/add-ons/print/drivers/shared/libprint/Jamfile

@@ -11,6 +11,7 @@ StaticLibrary print :
 	GraphicsDriver.cpp
 	Halftone.cpp
 	HalftoneView.cpp
+	JSDSlider.cpp
 	JobData.cpp
 	JobSetupDlg.cpp
 	PackBits.cpp