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GraphicsShell: drawing and zooming
Note: This example is designed to work with TechView and there is no guarantee that it will work with other interfaces.
The files reproduced here are the main files contained in the examples directory. Some extra files may be needed to run the examples, and these will be found in the appropriate examples directory.
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The files reproduced here are the main files contained in the examples directory. Some extra files may be needed to run the examples, and these will be found in the appropriate examples directory.
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// GraphicsShell.h
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
#ifndef __GraphicsShell_H
#define __GraphicsShell_H
#include <coecntrl.h>
#include <coeccntx.h>
#include <eikappui.h>
#include <eikapp.h>
#include <eikdoc.h>
#include "GraphicsControl.h"
// UID of app
const TUid KUidExampleShellApp={ 0x10004289 };
//
// TExampleShellModel
//
class TExampleShellModel
{
public:
TExampleShellModel();
TBool Differs(const TExampleShellModel* aCompare) const;
public:
TFileName iLibrary; // active control
};
//
// class CExampleShellContainer
//
class CExampleShellContainer : public CCoeControl,
public MCoeControlBrushContext,
public MGraphicsExampleObserver
{
public:
void ConstructL(const TRect& aRect, TExampleShellModel* aModel);
~CExampleShellContainer();
// changing view
void ResetExampleL(CGraphicExampleControl* aExample);
private: // from CCoeControl
void Draw(const TRect& /*aRect*/) const;
TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType);
TInt CountComponentControls() const;
CCoeControl* ComponentControl(TInt aIndex) const;
private: // from MGraphicsExampleObserver
void NotifyGraphicExampleFinished();
public: // also from MGraphicsExampleObserver
void NotifyStatus(const TDesC& aMessage);
private: // new function
void CreateLabelL();
private: // data
CGraphicExampleControl* iExampleControl; // example control
CEikLabel* iLabel; // label for status messages
// irrelevant
TExampleShellModel* iModel;
};
//
// CExampleShellDocument
//
class CExampleShellDocument : public CEikDocument
{
public:
CExampleShellDocument(CEikApplication& aApp): CEikDocument(aApp) { }
TExampleShellModel* Model() { return(&iModel); }
private: // from CEikDocument
CEikAppUi* CreateAppUiL();
private:
TExampleShellModel iModel;
};
//
// CExampleShellAppUi
//
class CExampleShellAppUi : public CEikAppUi
{
public:
void ConstructL();
~CExampleShellAppUi();
private: // from CEikAppUi
void HandleCommandL(TInt aCommand);
private: // internal use
// void PrepareToolbarButtons();
private:
CExampleShellContainer* iContainer;
TExampleShellModel* iModel;
};
//
// CExampleShellApplication
//
class CExampleShellApplication : public CEikApplication
{
private: // from CApaApplication
CApaDocument* CreateDocumentL();
TUid AppDllUid() const;
};
#endif// GraphicsControl.h
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
#ifndef __GraphicsControl_H
#define __GraphicsControl_H
#include <coecntrl.h>
#include <s32file.h>
#include "CommonGraphicsControlFramework.h"
// sundry derived classes
class CDrawControl : public CGraphicExampleControl
{
public:
CDrawControl() { SetMaxPhases(26); };
void UpdateModelL();
void Draw(const TRect& aRect) const;
};
class CZoomControl : public CGraphicExampleControl
{
public:
CZoomControl() { SetMaxPhases(5); };
~CZoomControl() { delete(iBitmap); };
void UpdateModelL();
void Draw(const TRect& aRect) const;
void DrawLeft(TRect screenRect,CWindowGc& gc) const;
void DrawRight(TRect screenRect,CWindowGc& gc) const;
private:
void LoadBitmapL(CFbsBitmap* aBitMap,const TDesC& aPathAndFile,TInt aId,TBool aShareIfLoaded);
private:
TZoomFactor iLeftZf;
TZoomFactor iRightZf;
MGraphicsDeviceMap* iLeftMap;
MGraphicsDeviceMap* iRightMap;
CFbsBitmap* iBitmap;
};
#endif// Draw.cpp
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
#include "GraphicsControl.h"
#include <coemain.h>
// Text printed to the console in UpdateModeL()
_LIT(KTxtUpdateModelCase0,"point in center of screen");
_LIT(KTxtUpdateModelCase1,"bolder point in center of screen");
_LIT(KTxtUpdateModelCase2,"really bold point in center of screen");
_LIT(KTxtUpdateModelCase3,"a line");
_LIT(KTxtUpdateModelCase4,"a thicker line");
_LIT(KTxtUpdateModelCase5,"really thick - note round ends and clipping");
_LIT(KTxtUpdateModelCase6,"dotted line");
_LIT(KTxtUpdateModelCase7,"dot-dash line");
_LIT(KTxtUpdateModelCase8,"triangle using relative drawing");
_LIT(KTxtUpdateModelCase9,"thick triangle - note rounded corners");
_LIT(KTxtUpdateModelCase10,"dotted triangle - note pattern continuation");
_LIT(KTxtUpdateModelCase11,"centered ellipse");
_LIT(KTxtUpdateModelCase12,"arc - part of ellipse");
_LIT(KTxtUpdateModelCase13,"arc - other part - see also construction elements");
_LIT(KTxtUpdateModelCase14,"pie slices");
_LIT(KTxtUpdateModelCase15,"centered rectangle with rounded corners");
_LIT(KTxtUpdateModelCase16,"rounded rectangle showing corner ellipse");
_LIT(KTxtUpdateModelCase17,"polyline");
_LIT(KTxtUpdateModelCase18,"polygon with winding-fill rule");
_LIT(KTxtUpdateModelCase19,"polygon using alternate-fill rule");
_LIT(KTxtUpdateModelCase20,"copying using CopyRect()");
_LIT(KTxtUpdateModelCase21,"left-justified boxed text");
_LIT(KTxtUpdateModelCase22,"centered boxed text");
_LIT(KTxtUpdateModelCase23,"right-justified offset text");
_LIT(KTxtUpdateModelCase24,"cross-hatched box");
_LIT(KTxtUpdateModelCase25,"teeny preview font!");
_LIT(KTxtUpdateModelDefault,"overran!");
void CDrawControl::UpdateModelL()
{
switch (Phase())
{
case 0:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase0);
break;
case 1:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase1);
break;
case 2:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase2);
break;
case 3:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase3);
break;
case 4:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase4);
break;
case 5:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase5);
break;
case 6:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase6);
break;
case 7:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase7);
break;
case 8:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase8);
break;
case 9:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase9);
break;
case 10:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase10);
break;
case 11:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase11);
break;
case 12:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase12);
break;
case 13:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase13);
break;
case 14:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase14);
break;
case 15:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase15);
break;
case 16:
{
iGraphObserver->NotifyStatus(KTxtUpdateModelCase16);
}
break;
case 17:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase17);
break;
case 18:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase18);
break;
case 19:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase19);
break;
case 20:
{
iGraphObserver->NotifyStatus(KTxtUpdateModelCase20);
}
break;
case 21:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase21);
break;
case 22:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase22);
break;
case 23:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase23);
break;
case 24:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase24);
break;
case 25:
iGraphObserver->NotifyStatus(KTxtUpdateModelCase25);
break;
default:
iGraphObserver->NotifyStatus(KTxtUpdateModelDefault);
break;
}
}
// Text printed to the console in UpdateModeL()
_LIT(KTxtDrawCase21,"White text left justified in dark gray box");
_LIT(KTxtDrawCase22,"White text centered in black box");
_LIT(KTxtDrawCase23,"Dark gray text right justified in lite gray box");
_LIT(KTxtDrawCase25,"This text overwrites the cleared area");
void CDrawControl::Draw(const TRect& /* aRect */) const
{
// put the next line back in to see the individual drawing actions
// (iCoeEnv->WsSession()).SetAutoFlush(ETrue);
// draw surrounding rectangle
CWindowGc& gc=SystemGc(); // graphics context we draw to
gc.UseFont(iMessageFont); // use the system message font
gc.Clear();
SystemGc().DrawRect(Rect()); // surrounding rectangle to draw into
TRect rect=Rect(); // a centered rectangle of the default size
TRect ellipseRect=Rect(); // for arcs and ellipse
ellipseRect.Shrink(10,10); // set size so inside the border rectangle
TRect box=Rect(); // a smaller centered rectangle, for text in a box
box.Shrink(10,10); // set size of text box
TRect tinyBox=Rect(); // a tiny box to clear
tinyBox.Shrink(220,90); // set size of tiny box to clear
TInt offset=0; // offset, for text in a box
TPoint screenCenterPoint=rect.Center(); // the center of the screen
// set up a pair of construction points for arc and pie slice drawing
// set up the size for half a screen (divided vertically)
TPoint constructionPoint1(15,15); // outside the construction ellipse
TPoint constructionPoint2(200,150); // inside the construction ellipse
// set up a pair of points for drawing diagonal lines
TPoint startPoint(50,50);
TPoint endPoint(590,190);
// set up an array of points for drawing a polyline and a polygon etc
// will be used relative to top left of rectangle
TPoint point1(20,20);
TPoint point2(100,190);
TPoint point3(110,90);
TPoint point4(50,150);
TPoint point5(200,150);
CArrayFix<TPoint>* mypoints;
mypoints = new CArrayFixFlat<TPoint>(5);
mypoints->AppendL(point1);
mypoints->AppendL(point2);
mypoints->AppendL(point3);
mypoints->AppendL(point4);
mypoints->AppendL(point5);
// set up a black, a dark gray, a lite gray and a white RGB color
TRgb black(0,0,0);
TRgb darkGray(85,85,85);
TRgb liteGray(170,170,170);
TRgb white(255,255,255); // appears as blank screen gray-green color
// Set up a "bold" size for the pen tip to (default is 1,1)
TSize penSizeBold(3,3);
// Set up a "fat" size for the pen tip
TSize penSizeFat(30,30);
// decide what to do, and do it
switch (Phase())
{
case 0:
// draw a single pixel point in the center of the screen
// it is so small that some text is needed to explain the screen...
gc.Plot(screenCenterPoint);
break;
case 1:
// draw a "bold" point 3 pixels across
gc.SetPenSize(penSizeBold);
gc.Plot(screenCenterPoint);
break;
case 2:
// draw a "fat" point (circular blob),
// illustrating the effect of a very wide pen
gc.SetPenSize(penSizeFat);
gc.Plot(screenCenterPoint);
break;
case 3:
// draw a thin line fromtop left to bottom right
gc.DrawLine(startPoint,endPoint);
break;
case 4:
// draw a "bold" line fromtop left to bottom right
gc.SetPenSize(penSizeBold);
gc.DrawLine(startPoint,endPoint);
break;
case 5:
// draw a rather wide line from top left to bottom right,
// illustrating rounded ends and their clipping
gc.SetPenSize(penSizeFat);
gc.DrawLine(startPoint,endPoint);
break;
case 6:
// draw a dotted line from top left to bottom right
gc.SetPenStyle(CGraphicsContext::EDottedPen);
gc.DrawLine(startPoint,endPoint);
break;
case 7:
// draw a dot-dash line from top left to bottom right
gc.SetPenStyle(CGraphicsContext::EDotDashPen);
gc.DrawLine(startPoint,endPoint);
break;
case 8:
// draw a triangle by relative drawing
gc.MoveTo(TPoint(300,50)); // drawing position (300,50)
gc.DrawLineBy(TPoint(205,100)); // drawing position (505,150)
gc.DrawLineBy(TPoint(-410,0)); // drawing position (95,150)
gc.DrawLineBy(TPoint(205,-100)); // drawing position (300,50)
break;
case 9:
// draw a triangle, by relative drawing
// illustrating rounded ends at corners when using very wide lines
gc.SetPenSize(penSizeFat);
gc.MoveTo(TPoint(300,50)); // drawing position (300,50)
gc.DrawLineBy(TPoint(205,100)); // drawing position (505,150)
gc.DrawLineBy(TPoint(-410,0)); // drawing position (95,150)
gc.DrawLineBy(TPoint(205,-100)); // drawing position (300,50)
break;
case 10:
// draw a triangle by sequential drawing between specified points,
// using dot-dash line style, illustrating line pattern continuation
gc.SetPenStyle(CGraphicsContext::EDotDashPen);
gc.MoveTo(TPoint(300,50)); // drawing position (300,50)
gc.DrawLineTo(TPoint(505,150)); // drawing position (505,150)
gc.DrawLineTo(TPoint(95,150)); // drawing position (95,150)
gc.DrawLineTo(TPoint(300,50)); // drawing position (300,50)
break;
case 11:
// draw an ellipse centered in the rectangle
gc.DrawEllipse(ellipseRect);
break;
case 12:
// draw an arc centered in the rectangle
gc.DrawArc(ellipseRect,constructionPoint1,constructionPoint2);
// gc.Clear();
break;
case 13:
// draw an arc centered in the rectangle that is the other
// portion of the ellipse (arguments reversed)
gc.DrawArc(ellipseRect,constructionPoint2,constructionPoint1);
// draw construction lines and points
gc.SetPenStyle(CGraphicsContext::EDottedPen);
gc.MoveTo(constructionPoint1);
gc.DrawLineTo(screenCenterPoint);
gc.DrawLineTo(constructionPoint2);
gc.SetPenSize(penSizeBold);
gc.Plot(constructionPoint1);
gc.Plot(constructionPoint2);
gc.Plot(screenCenterPoint);
break;
case 14:
// draw a pie slice centered in the rectangle
gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
gc.SetBrushColor(white);
gc.DrawPie(ellipseRect,constructionPoint1,constructionPoint2);
// draw the other portion of the elliptical disc
gc.SetBrushStyle(CGraphicsContext::EVerticalHatchBrush);
gc.DrawPie(ellipseRect,constructionPoint2,constructionPoint1);
break;
case 15:
{
// draw a rectangle with rounded corners, centered in the rectangle
TSize cornerSize(20,20); // size of a rounded corner
gc.DrawRoundRect(box,cornerSize); // same rect as text box
}
break;
case 16:
{
// draw a rectangle with rounded corners,
//centered in the rectangle, showing a corner ellipse
TSize cornerSize(20,20); // size of a rounded corner
// rect for corner ellipse is twice the corner size
TSize cornerEllipseSize(cornerSize.iHeight*2,cornerSize.iWidth*2);
TRect cornerRectTl(box.iTl,cornerEllipseSize);
gc.DrawRoundRect(box,cornerSize);
gc.SetPenStyle(CGraphicsContext::EDottedPen);
gc.DrawEllipse(cornerRectTl); // corner construction ellipse
}
break;
case 17:
// draw a polyline
gc.DrawPolyLine(mypoints);
break;
case 18:
// draw self-crossing polygon using the winding fill rule
gc.SetBrushStyle(CGraphicsContext::ESquareCrossHatchBrush);
gc.SetBrushColor(black);
gc.DrawPolygon(mypoints,CGraphicsContext::EWinding);
break;
case 19:
// draw self-crossing polygon using the alternate fill rule
gc.SetBrushStyle(CGraphicsContext::EDiamondCrossHatchBrush);
gc.SetBrushColor(black);
gc.DrawPolygon(mypoints,CGraphicsContext::EAlternate);
break;
case 20:
{
// draw self-crossing polygon using the alternate fill rule,
// and copy the lhs to the rhs of the screen
gc.SetBrushStyle(CGraphicsContext::EDiamondCrossHatchBrush);
gc.SetBrushColor(black);
gc.DrawPolygon(mypoints,CGraphicsContext::EAlternate);
TPoint screenOrigin(0,0); // top left of the screen
TSize halfScreenLR(320,240); // size of vertical half of screen
rect.SetRect(screenOrigin,halfScreenLR); // lhs of screen
TPoint offset(halfScreenLR.iWidth,0); // half screen width offset
gc.CopyRect(offset,rect); // copy lhs of screen to rhs
}
break;
case 21:
// draw some text left justified in a box,
// offset so text is just inside top of box
{
CFont* font=iMessageFont; // get the system message font
TInt fontAscent(font->AscentInPixels()); // system message font ascent
offset=fontAscent+3; // add a 3 pixel text line spacing
TInt margin=2; // left margin is two pixels
gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
gc.SetBrushColor(darkGray);
gc.SetPenColor(white);
gc.UseFont(iMessageFont);
gc.DrawText(KTxtDrawCase21,box,offset,CGraphicsContext::ELeft,margin);
}
break;
case 22:
// draw some text centered in a box, (margin is zero)
{
TInt boxHeight=box.Height(); // get height of text box
CFont* font=iMessageFont; // get the system message font
TInt textHeight(font->HeightInPixels()); // system message font height
offset=(textHeight+boxHeight)/2; // 1/2 font ht below halfway down box
TInt margin=0; // margin is zero
gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
gc.SetBrushColor(black);
gc.SetPenColor(white);
gc.UseFont(iMessageFont);
gc.DrawText(KTxtDrawCase22,box,offset,CGraphicsContext::ECenter,margin);
}
break;
case 23:
// draw some text right justified in a box,
// offset so text is just inside bottom of box
{
TInt boxHeight=box.Height(); // get height of text box
CFont* font=iMessageFont; // get the system message font
TInt fontDescent=font->DescentInPixels(); // system message font descent
offset=boxHeight-fontDescent-3;// offset, 3 pixel text line spacing
TInt margin=2; // right margin is two pixels
gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
gc.SetBrushColor(liteGray);
gc.SetPenColor(darkGray);
gc.UseFont(iMessageFont);
gc.DrawText(KTxtDrawCase23,box,offset,CGraphicsContext::ERight,margin);
}
break;
case 24:
{
// draw a cross-hatched box
// then clear a small central rectangle
gc.SetBrushColor(darkGray);
gc.SetBrushStyle(CGraphicsContext::ESquareCrossHatchBrush);
gc.DrawRect(rect);
// clear a small rectangle
gc.SetBrushColor(liteGray); // change the brush color
gc.Clear(tinyBox); // clear to brush color
}
break;
case 25:
{
// draw a cross-hatched box
// then clear a small central rectangle
// and write some text in it in smallest Swiss font,
// (which is actually a tiny "block" print-preview font)
// starting bottom left (illustrating flicker, overlap, mess)
gc.SetBrushColor(darkGray);
gc.SetBrushStyle(CGraphicsContext::ESquareCrossHatchBrush);
gc.DrawRect(rect);
// clear a small rectangle
gc.SetBrushColor(liteGray); // change the brush color
gc.Clear(tinyBox); // clear to brush color
// get an alternative font
CFont* myFont;
_LIT(KTxtArial,"Arial");
TFontSpec myFontSpec(KTxtArial,1); // to get smallest Arial font
CGraphicsDevice* screenDevice=(iCoeEnv->ScreenDevice());
screenDevice->GetNearestFontInTwips(myFont,myFontSpec);
gc.UseFont(myFont);
// set the text drawing position & draw (demonstrating flicker)
TInt fontDescent=myFont->DescentInPixels();
TPoint pos(0,tinyBox.Height()-fontDescent);
pos+=tinyBox.iTl;
gc.DrawText(KTxtDrawCase25,pos);
// discard and destroy the font
gc.DiscardFont();
screenDevice->ReleaseFont(myFont);
}
break;
default:
break;
}
delete mypoints; // an array must be destroyed after use
}//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
#include "GraphicsControl.h"
#include <coemain.h>
#include <coeaui.h>
_LIT(KtxtSwiss,"Swiss");
void CGraphicExampleControl::ConstructL(const TRect& aRect, MGraphicsExampleObserver* aGraphObserver,
const CCoeControl& aParent)
{
// remember the graphics observer
iGraphObserver=aGraphObserver;
// create window
CreateWindowL(&aParent);
// construct font for messages
TFontSpec spec(KtxtSwiss,213);
iMessageFont=iCoeEnv->CreateScreenFontL(spec);
// set rectangle to prescription
SetRect(aRect);
// go for it
ActivateL();
UpdateModelL(); // phase 0
}
CGraphicExampleControl::~CGraphicExampleControl()
{
iCoeEnv->ReleaseScreenFont(iMessageFont);
}
void CGraphicExampleControl::Quit()
{
iGraphObserver->NotifyGraphicExampleFinished();
}
void CGraphicExampleControl::NextPhaseL()
{
if (++iPhase >= iMaxPhases)
Quit();
else
{
UpdateModelL();
DrawNow();
}
}
void CGraphicExampleControl::HandlePointerEventL(const TPointerEvent& aPointerEvent)
{
if (aPointerEvent.iType==TPointerEvent::EButton1Down) NextPhaseL();
}
TKeyResponse CGraphicExampleControl::OfferKeyEventL(
const TKeyEvent& aKeyEvent,TEventCode aType
)
{
if (aType!=EEventKey) return EKeyWasNotConsumed;
TInt code=aKeyEvent.iCode;
switch (code)
{
case ' ':
NextPhaseL();
break;
default:
return EKeyWasNotConsumed;
}
return EKeyWasConsumed;
}// GraphicsShell.cpp
//
// Copyright (c) 2000-2005 Symbian Software Ltd. All rights reserved.
#include <e32keys.h>
#include <coemain.h>
#include <eikenv.h>
#include <eikdef.h>
#include <eikon.hrh>
#include <eiklabel.h>
#include <eikstart.h>
#include <GraphicsShell.rsg>
#include "GraphicsShell.hrh"
#include "GraphicsShell.h"
//
// TExampleShellModel
//
TExampleShellModel::TExampleShellModel()
{
iLibrary=KNullDesC;
}
TBool TExampleShellModel::Differs(const TExampleShellModel* aCompare) const
{
return((*(TInt32*)this)!=(*(TInt32*)aCompare));
}
//
// class CExampleShellContainer
//
void CExampleShellContainer::ConstructL(const TRect& aRect, TExampleShellModel* aModel)
{
iModel=aModel;
CreateWindowL();
Window().SetShadowDisabled(ETrue);
iContext=this;
iBrushStyle=CGraphicsContext::ESolidBrush;
iBrushColor=KRgbWhite;
SetRect(aRect);
CreateLabelL();
ActivateL();
}
CExampleShellContainer::~CExampleShellContainer()
{
delete iExampleControl;
delete iLabel;
}
TInt CExampleShellContainer::CountComponentControls() const
{
return 1 + (iExampleControl ? 1 : 0);
}
CCoeControl* CExampleShellContainer::ComponentControl(TInt aIndex) const
{
switch (aIndex)
{
case 0: return iLabel;
case 1: return iExampleControl;
default: return 0;
};
}
const TInt KLabelHeight=20;
void CExampleShellContainer::CreateLabelL()
{
iLabel=new (ELeave) CEikLabel;
TRect rect=Rect();
rect.iTl.iY=rect.iBr.iY-KLabelHeight; // make it bottom 20 pixels
iLabel->SetContainerWindowL(*this);
iLabel->SetRect(rect);
iLabel->SetAlignment(EHCenterVCenter); // center text
iLabel->SetBufferReserveLengthL(200); // nice long buffer
iLabel->SetFont(iEikonEnv->AnnotationFont());
iLabel->ActivateL(); // now ready
}
void CExampleShellContainer::ResetExampleL(CGraphicExampleControl* aExample)
{
// get rid of old control
delete iExampleControl;
// set up new one
iExampleControl=aExample;
// if non-zero, then carry on
if (!iExampleControl) return;
TRect rect=Rect(); // get our rect
rect.iBr.iY-=KLabelHeight; // make way for label
rect.Shrink(2,2); // shrink it a bit
iExampleControl->ConstructL(rect,this,*this); // construct, giving rect, observer, and parent
}
_LIT(KTxtFinished,"example finished");
void CExampleShellContainer::NotifyGraphicExampleFinished()
{
NotifyStatus(KTxtFinished);
}
void CExampleShellContainer::NotifyStatus(const TDesC& aMessage)
{
iLabel->SetTextL(aMessage);
if (IsActivated()) iLabel->DrawNow();
}
TKeyResponse CExampleShellContainer::OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType)
{
if (iExampleControl)
return iExampleControl->OfferKeyEventL(aKeyEvent,aType);
else
return EKeyWasNotConsumed;
}
void CExampleShellContainer::Draw(const TRect& /*aRect*/) const
{
CWindowGc& gc = SystemGc();
gc.SetPenStyle(CGraphicsContext::ENullPen);
gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
gc.DrawRect(Rect());
}
//
// CExampleShellAppUi
//
_LIT(KTxtInitialized,"initialized");
void CExampleShellAppUi::ConstructL()
{
BaseConstructL();
iModel=((CExampleShellDocument*)iDocument)->Model();
iContainer=new(ELeave) CExampleShellContainer;
iContainer->ConstructL(ClientRect(),iModel);
iContainer->NotifyStatus(KTxtInitialized);
// add container to stack; enables key event handling.
AddToStackL(iContainer);
}
void CExampleShellAppUi::HandleCommandL(TInt aCommand)
{
switch (aCommand)
{
case EExampleShellSelectDraw:
iContainer->ResetExampleL(new (ELeave) CDrawControl);
return;
case EExampleShellSelectZoom:
iContainer->ResetExampleL(new (ELeave) CZoomControl);
return;
case EEikCmdExit:
Exit();
return;
}
}
CExampleShellAppUi::~CExampleShellAppUi()
{
RemoveFromStack(iContainer);
delete iContainer;
}
//
// CExampleShellDocument
//
CEikAppUi* CExampleShellDocument::CreateAppUiL()
{
return(new(ELeave) CExampleShellAppUi);
}
//
// CExampleShellApplication
//
TUid CExampleShellApplication::AppDllUid() const
{
return KUidExampleShellApp;
}
CApaDocument* CExampleShellApplication::CreateDocumentL()
{
return new(ELeave) CExampleShellDocument(*this);
}
//
// EXPORTed functions
//
EXPORT_C CApaApplication* NewApplication()
{
return new CExampleShellApplication;
}
GLDEF_C TInt E32Main()
{
return EikStart::RunApplication(NewApplication);
}// Zoom.cpp
//
// Copyright (c) 2000-2005 Symbian Software Ltd. All rights reserved.
#include "GraphicsControl.h"
// header for multi-bitmap file grbitmap.mbm containing 2 bitmaps to use
#include <grbmap2.mbg>
#include <coemain.h>
_LIT(KTxtCDrive,"C:");
_LIT(KTxtZDrive,"Z:");
void CZoomControl::LoadBitmapL(CFbsBitmap* aBitMap,const TDesC& aPathAndFile,TInt aId,TBool aShareIfLoaded)
{
TParse mbfn;
mbfn.Set(aPathAndFile,&KTxtCDrive,NULL);
if (!aBitMap->Load(mbfn.FullName(),aId,aShareIfLoaded))
return;
mbfn.Set(aPathAndFile,&KTxtZDrive,NULL);
User::LeaveIfError(aBitMap->Load(mbfn.FullName(),aId,aShareIfLoaded));
return;
}
// Name of the multi-bitmap file containing the bitmap
// and bitmap mask files
_LIT(KTxtFileName,"\\resource\\apps\\grbmap2.mbm");
void CZoomControl::UpdateModelL()
{
// set up name for bitmap sharing
TBool shareIfLoaded(ETrue);
// set up two zoom factor objects (one for examples, one for commentary)
iLeftZf.SetGraphicsDeviceMap(iCoeEnv->ScreenDevice());
iRightZf.SetGraphicsDeviceMap(iCoeEnv->ScreenDevice());
//iLeftZf.SetDevice(iCoeEnv->ScreenDevice());
//iRightZf.SetDevice(iCoeEnv->ScreenDevice());
// set the zoom factor of the objects (example is dependent on phase of example, commentary is fixed)
iLeftZf.SetZoomFactor(TZoomFactor::EZoomOneToOne*2*(Phase()+1)/5);
iRightZf.SetZoomFactor(TZoomFactor::EZoomOneToOne*2*(5-Phase())/5);
// use graphics device maps for drawing and getting fonts
iLeftMap=&iLeftZf;
iRightMap=&iRightZf;
if (Phase()==0) {
iBitmap = new (ELeave) CFbsBitmap();
LoadBitmapL(iBitmap,KTxtFileName,EMbmGrbmap2Smiley,shareIfLoaded);
}
// set up descriptor for commentary area
_LIT(KFormat1,"Left zoom factor=%1.1f:1 Right zoom factor=%1.1f:1");
TBuf<128> commentaryText;
TReal leftValue = 2*(Phase()+1)/5.0;
TReal rightValue = 2*(5-Phase())/5.0;
commentaryText.Format(KFormat1,leftValue,rightValue);
iGraphObserver->NotifyStatus(commentaryText);
};
void CZoomControl::Draw(const TRect& /* aRect */) const
{
// setup screen for example: get graphics context and draw surrounding rectangle
CWindowGc& gc=SystemGc();
gc.Clear();
// create a centered rectangle of the default size
TRect screenRect=Rect();
TInt bisect = (screenRect.iBr.iX-screenRect.iTl.iX)/2 + screenRect.iTl.iX;
TRect leftRect(screenRect.iTl,TPoint(bisect,screenRect.iBr.iY));
TRect rightRect(TPoint(bisect,screenRect.iTl.iY),screenRect.iBr);
DrawLeft(leftRect,gc);
DrawRight(rightRect,gc);
}
_LIT(KTxtTimesNewRoman,"Times New Roman");
_LIT(KTxtGrzoomExampleText,"grzoom example text");
void CZoomControl::DrawLeft(TRect screenRect,CWindowGc& SystemGc) const
{
// set up absolute font-spec and text box for 200 twip Times font
TFontSpec fontSpec(KTxtTimesNewRoman,200);
// find the nearest font to the specified one
CFont* screenFont;
iLeftMap->GetNearestFontInTwips(screenFont,fontSpec);
// use it for this graphics context
SystemGc.UseFont(screenFont);
// get height of screen box
TInt screenHeight=screenRect.Height();
// get font height
TInt textHeight = screenFont->HeightInPixels();
// 1/2 font height below halfway down box
TInt exampleOffset=(screenHeight+textHeight)/2;
TInt exampleMargin=0;
SystemGc.DrawText(KTxtGrzoomExampleText,screenRect,exampleOffset,CGraphicsContext::ECenter,exampleMargin);
// discard and release font
SystemGc.DiscardFont();
iLeftMap->ReleaseFont(screenFont);
// set up example box in twips
TRect boxInTwips(TPoint(0,0),TPoint(500,300));
// convert rectangle co-ordinates into pixels
TRect boxInPixels = iLeftMap->TwipsToPixels(boxInTwips);
SystemGc.DrawRect(boxInPixels);
// set up rectangle for bitmap to be stretched into
TRect bitmapRectInTwips(TPoint(0,0),TPoint(500,500));
TRect bitmapRectInPixels = iLeftMap->TwipsToPixels(bitmapRectInTwips);
bitmapRectInPixels.iTl.iY+=125;
bitmapRectInPixels.iBr.iY+=125;
bitmapRectInPixels.iTl.iX+=100;
bitmapRectInPixels.iBr.iX+=100;
// draw the bitmap, stretched into the rectangle
SystemGc.DrawBitmap(bitmapRectInPixels, iBitmap);
}
void CZoomControl::DrawRight(TRect screenRect,CWindowGc& SystemGc) const
{
// set up colors: black and a white RGB color
TRgb black(0,0,0);
TRgb white(255,255,255); // appears as blank screen gray-green color
SystemGc.SetBrushStyle(CGraphicsContext::ESolidBrush);
SystemGc.SetBrushColor(black);
SystemGc.SetPenColor(white);
// set up absolute font-spec and text box for 200 twip Times font
TFontSpec fontSpec(KTxtTimesNewRoman,200);
// find the nearest font to the specified one
CFont* commentFont;
iRightMap->GetNearestFontInTwips(commentFont,fontSpec);
// use it for this graphics context
SystemGc.UseFont(commentFont);
// get font height
TInt textHeight = commentFont->HeightInPixels();
// get height of text box
TInt boxHeight=screenRect.Height();
// 1/2 font height below halfway down box
TInt commentOffset=(boxHeight+textHeight)/2;
TInt commentMargin=0;
// draw text
SystemGc.DrawText(KTxtGrzoomExampleText,screenRect,commentOffset,CGraphicsContext::ECenter,commentMargin);
// discard and release font
SystemGc.DiscardFont();
iRightMap->ReleaseFont(commentFont);
// set up example box in twips
TRect boxInTwips(TPoint(0,0),TPoint(500,300));
// convert rectangle co-ordinates into pixels
TRect boxInPixels = iRightMap->TwipsToPixels(boxInTwips);
boxInPixels.Move(screenRect.iTl);
SystemGc.DrawRect(boxInPixels);
// set up rectangle for bitmap to be stretched into
TRect bitmapRectInTwips(TPoint(0,0),TPoint(500,500));
TRect bitmapRectInPixels = iRightMap->TwipsToPixels(bitmapRectInTwips);
bitmapRectInPixels.Move(screenRect.iTl);
bitmapRectInPixels.iTl.iY+=125;
bitmapRectInPixels.iBr.iY+=125;
bitmapRectInPixels.iTl.iX+=100;
bitmapRectInPixels.iBr.iX+=100;
// draw the bitmap, stretched into the rectangle
SystemGc.DrawBitmap(bitmapRectInPixels, iBitmap);
}// GraphicsShell.hrh
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
enum TExampleMenuCommands
{
EExampleShellSelectDraw=400,
EExampleShellSelectZoom
};// BLD.INF
// Component description file
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
PRJ_MMPFILES
GraphicsShell.mmp// GraphicsShell.mmp
//
// Copyright (c) 2000-2005 Symbian Software Ltd. All rights reserved.
// using relative paths for source and userinclude directories
TARGET GraphicsShell.exe
TARGETTYPE exe
UID 0x100039ce 0x10004289
VENDORID 0x70000001
SOURCEPATH .
SOURCE Zoom.cpp GraphicsShell.cpp GraphicsControl.cpp Draw.cpp
START RESOURCE GraphicsShell.rss
TARGETPATH \resource\apps
HEADER
END
USERINCLUDE .
USERINCLUDE .\CommonGraphicsExampleFiles
SYSTEMINCLUDE \Epoc32\include
SYSTEMINCLUDE \epoc32\include\techview
LIBRARY euser.lib efsrv.lib gdi.lib ws32.lib fbscli.lib
LIBRARY cone.lib apparc.lib eikcore.lib eikcoctl.lib
START BITMAP grbmap2.mbm
TARGETPATH \resource\apps
HEADER
SOURCE c8 Smiley.bmp Smilmask.bmp
END
START RESOURCE GraphicsShell_reg.rss
TARGETPATH \private\10003a3f\apps
END// GraphicsShell.rss
//
// Copyright (c) 2000 Symbian Ltd. All rights reserved.
NAME GRSH
#include <eikon.rh>
#include "GraphicsShell.hrh"
RESOURCE RSS_SIGNATURE { }
RESOURCE TBUF { buf=""; }
RESOURCE EIK_APP_INFO
{
menubar=r_grsh_menubar;
hotkeys=r_grsh_hotkeys;
}
RESOURCE HOTKEYS r_grsh_hotkeys
{
control=
{
HOTKEY { command=EEikCmdExit; key='e'; }
};
}
RESOURCE MENU_BAR r_grsh_menubar
{
titles=
{
MENU_TITLE {menu_pane=menu1; txt="File"; },
MENU_TITLE {menu_pane=menu2; txt="List Of Programs "; }
};
}
RESOURCE MENU_PANE menu1
{
items=
{
MENU_ITEM { command=EEikCmdExit; txt="Exit"; }
};
}
RESOURCE MENU_PANE menu2
{
items=
{
MENU_ITEM { command=EExampleShellSelectDraw; txt="Draw"; },
MENU_ITEM { command=EExampleShellSelectZoom; txt="Zoom"; }
};
}GraphicsShell_reg.rss
#include <appinfo.rh>
UID2 KUidAppRegistrationResourceFile
UID3 0x10004289 // application UID
RESOURCE APP_REGISTRATION_INFO
{
app_file = "GraphicsShell";
}|
|
GraphicsShell provides an application shell, and two
concrete controls.
CGraphicExampleControl is a control class, derived from
CCoeControl, which links the app shell to the particular controls.
CDrawControl illustrates the drawing of shapes in a
window. The code draws points, lines and shapes; this exercises a variety of
drawing functions provided by the window graphics context such as
MoveTo(), DrawLineTo(), DrawArc() etc.
CZoomControl illustrates the use of zooming.
|
|
The source code for this example application can be found in the directory:
examples\Graphics
It may be in the directory in which you installed Symbian OS, or it may
be in src\common\developerlibrary\. It includes the two project
files needed for building: bld.inf and the .mmp file.
The Symbian OS build process describes how to build this application. For the emulator, an
application called GraphicsShell.exe is created in
epoc32\release\winscw\<udeb or urel>\.
|
|
Launch the emulator:
\epoc32\release\winscw\<udeb or urel>\EPOC.EXE.
Click on GRAPHICSSHELL to run the application. If
using the TechView emulator, this will be in the
Extras menu.
The controls are listed on the menu List of
Programs. Press the appropriate menu item to select a specific
control.
Step through each phase of the example by pressing the space bar or by tapping on the window drawn by that example.
|
|
By the drawing control:
TPoint: 2-dimensional geometric point
TRect: a geometric rectangle
TSize: 2-dimensional geometric size
CWindowGc: the window graphics context
TRgb: colour representation
CFont: font interface class
By the zooming control:
TFontSpec: font specification in device independent
terms
CWindowGc: the window graphics context
CFont: font interface class
TZoomFactor: zoom factor and twips/pixels conversions
MGraphicsDeviceMap: a mixin class defining the
interface for mapping between twips and device-specific units (pixels)
CFbsBitmap: Bitmap managed by the font and bitmap
server
|
Copyright © 2005-2008 Symbian Software Ltd. |
|
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