Added OpenBeOS text screensaver, renamed to Haiku

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@10558 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/screen_savers/Jamfile

@@ -1,4 +1,4 @@
 SubDir OBOS_TOP src add-ons screen_savers ;
 
+SubInclude OBOS_TOP src add-ons screen_savers haiku ;
 SubInclude OBOS_TOP src add-ons screen_savers slideshowsaver ;
-

src/add-ons/screen_savers/haiku/Jamfile

@@ -0,0 +1,6 @@
+SubDir OBOS_TOP src add-ons screen_savers haiku ;
+
+ScreenSaver haiku :
+	ScreenSaver.cpp ;
+
+LinkSharedOSLibs haiku : be screensaver ;

src/add-ons/screen_savers/haiku/ScreenSaver.cpp

@@ -0,0 +1,109 @@
+/* 
+**
+** A simple screensaver, displays the text "OpenBeOS" at random locations.
+**
+** Version: 2.0
+**
+** Copyright (c) 2002 Marcus Overhagen. All Rights Reserved.
+** This file may be used under the terms of the OpenBeOS License.
+*/
+
+#include <ScreenSaver.h>
+#include <View.h>
+#include <StringView.h>
+#include <Font.h>
+#include <stdlib.h>
+
+class ScreenSaver : public BScreenSaver
+{
+public:
+	ScreenSaver(BMessage *archive, image_id);
+	void Draw(BView *view, int32 frame);
+	void StartConfig(BView *view);
+	status_t StartSaver(BView *view, bool preview);
+	
+private:
+	const char *fText;
+	float fX;
+	float fY;
+	float fSizeX;
+	float fSizeY;
+	float fTextHeight;
+	float fTextWith;
+	bool fIsPreview;
+};
+
+BScreenSaver *instantiate_screen_saver(BMessage *msg, image_id image) 
+{ 
+	return new ScreenSaver(msg, image);
+} 
+
+ScreenSaver::ScreenSaver(BMessage *archive, image_id id) :
+	BScreenSaver(archive, id),
+	fText("OpenBeOS"),
+	fX(0),
+	fY(0)
+{
+}
+
+void 
+ScreenSaver::StartConfig(BView *view) 
+{ 
+	view->AddChild(new BStringView(BRect(20,10,200,35), "", "OpenBeOS, by Marcus Overhagen"));
+} 
+
+status_t 
+ScreenSaver::StartSaver(BView *view, bool preview)
+{
+	// save view dimensions and preview mode
+	fIsPreview = preview;
+	fSizeX = view->Bounds().Width();
+	fSizeY = view->Bounds().Height();
+	
+	// set a new font, about 1/8th of view height, and bold
+	BFont font;
+	view->GetFont(&font);
+	font.SetSize(fSizeY / 8);
+	font.SetFace(B_BOLD_FACE);
+	view->SetFont(&font);
+	
+	// find out space needed for text display
+	BRect rect;
+	escapement_delta delta;
+	delta.nonspace = 0;
+	delta.space = 0;
+	font.GetBoundingBoxesForStrings(&fText,1,B_SCREEN_METRIC,&delta,&rect);
+	fTextHeight = rect.Height();
+	fTextWith = rect.Width();
+	
+	// seed the random number generator
+	srand((int)system_time());
+	
+	return B_OK;
+}
+
+void 
+ScreenSaver::Draw(BView *view, int32 frame)
+{
+	if (frame == 0) { 
+		// fill with black on first frame
+		view->SetLowColor(0, 0, 0); 
+		view->FillRect(view->Bounds(), B_SOLID_LOW); 
+	} else {
+		// erase old text on all other frames
+		view->SetHighColor(0,0,0);
+		view->DrawString(fText,BPoint(fX,fY));
+	}
+
+	// find some new text coordinates
+	fX = rand() % int(fSizeX - fTextWith);
+	fY = rand() % int(fSizeY - fTextHeight - (fIsPreview ? 2 : 20)) + fTextHeight;
+
+	// draw new text
+	view->SetHighColor(0,255,0);
+	view->DrawString(fText,BPoint(fX,fY));
+
+	// randomize time until next update (preview mode is faster)
+	SetTickSize(((rand() % 4) + 1) * (fIsPreview ? 300000 : 1000000));
+}
+