shapesbarchartcontainer.cpp

来自「最新官方例子,图形,描述副,基本控件,通讯协议,等等,」· C++ 代码 · 共 190 行

/**
 * 
 * @brief Definition of CShapesBarChartContainer
 *
 * Copyright (c) EMCC Software Ltd 2003
 * @version 1.0
 */

// INCLUDE FILES

// Class includes
#include "ShapesBarChartContainer.h"

// System includes
#include <e32math.h>	// Math::Rand
#include <eikenv.h>		// AKN_LAF_COLOR

// User includes
#include "ShapesModel.h"	// CShapesModel

// CONSTANTS

const TInt KAxisScaleFactor = 10;
const TInt KMaxColorValue = 215;
const TInt KColorBlack = 215;

// ================= MEMBER FUNCTIONS =======================

/**
 * Symbian OS 2 phase constructor.
 * Constructs the CShapesBarChartContainer using the NewLC method, popping
 * the constructed object from the CleanupStack before returning it.
 * 
 * @param aShapesModel a reference to the model
 * @param aRect The rectangle for this window
 * @return The newly constructed CShapesBarChartContainer
 */
CShapesBarChartContainer* CShapesBarChartContainer::NewL(CShapesModel& aShapesModel, const TRect& aRect)
	{
	CShapesBarChartContainer* self = CShapesBarChartContainer::NewLC(aShapesModel, aRect);
	CleanupStack::Pop(self);
	return self;
	}

/**
 * Symbian OS 2 phase constructor.
 * Constructs the CShapesBarChartContainer using the constructor and ConstructL 
 * method, leaving the constructed object on the CleanupStack before returning it.
 * 
 * @param aShapesModel a reference to the model
 * @param aRect The rectangle for this window
 * @return The newly constructed CShapesBarChartContainer
 */
CShapesBarChartContainer* CShapesBarChartContainer::NewLC(CShapesModel& aShapesModel, const TRect& aRect)
	{
	CShapesBarChartContainer* self = new (ELeave) CShapesBarChartContainer(aShapesModel);
	CleanupStack::PushL(self);
	self->ConstructL(aRect);
	return self;
	}

/**
 * C++ constructor
 *
 * @param aShapesModel a reference to the model
 */
CShapesBarChartContainer::CShapesBarChartContainer(CShapesModel& aShapesModel)
 : iShapesModel(aShapesModel)
	{
	}

/**
 * Symbian OS 2nd phase constructor.  Creates a Window for the control to draw to.
 * Activates the control
 *
 * @param aRect The rectangle for this window
 */ 
void CShapesBarChartContainer::ConstructL(const TRect& aRect)
	{
	CreateWindowL();
	SetRect(aRect);
	ActivateL();
	}

/**
 * Destructor
 */
CShapesBarChartContainer::~CShapesBarChartContainer()
	{
	}

/**
 * Draw functions calls axis and chart drawing functions
 *
 * @param aRect Rectangular area of control
 */
void CShapesBarChartContainer::Draw(const TRect& aRect) const
	{
	// Clear the graphics context.
	CWindowGc& gc = SystemGc();
	gc.Clear();

	TRect axisRect;
	DrawAxes(aRect, axisRect);
	DrawChart(axisRect);	
	}

/**
 * Draws the axes of the chart
 *
 * @param aRect Rectangular area of control 
 * @param aAxisRect Returns a rectangular area formed by the axes generated by this function
 */
void CShapesBarChartContainer::DrawAxes(const TRect& aRect, TRect& aAxisRect) const
	{
	// Get a reference to the graphics context.
	CWindowGc& gc = SystemGc();

	// Set the pen style and color.
	gc.SetPenStyle(CGraphicsContext::ESolidPen);
	TRgb colorBlack = AKN_LAF_COLOR(KColorBlack);
	gc.SetPenColor(colorBlack);

	// Calculate the extent of the axes.
	const TInt yAxisMax = aRect.Height() / KAxisScaleFactor;
	const TInt originY = aRect.Height() - yAxisMax;
	const TInt originX = aRect.Width() / KAxisScaleFactor;
	const TInt xAxisMax = aRect.Width() - originX;
	
	// Draw axes and set extent of aAxisRect.
	gc.DrawLine(TPoint(originX, yAxisMax), TPoint(originX, originY));
	gc.DrawLine(TPoint(originX, originY), TPoint(xAxisMax, originY));
	aAxisRect.SetRect(TPoint(originX, yAxisMax), TPoint(xAxisMax, originY)); 
	}

/**
 * Draws the bar chart through the DrawRect() function of the
 * system graphics context
 *
 * @param aAxisRect The rectangular area of the axis
 */
void CShapesBarChartContainer::DrawChart(TRect& aAxisRect) const
	{
	// Get a refernce to the graphics context.
	CWindowGc& gc = SystemGc();

	// Don't use the pen.
	gc.SetPenStyle(CGraphicsContext::ENullPen);	
	
	// Set up the random seed.
	TTime time;
	time.HomeTime();
	TInt64 colorSeed = time.Int64();

	// Calculate values.
	const TInt numElements = iShapesModel.NumElements();
	const TInt maxValue = iShapesModel.GetMaxValue();

	if (!maxValue)
		return;
	
	TPoint originOfCurrentBar(aAxisRect.iTl.iX, aAxisRect.iBr.iY);	// This is 0,0 translated
	const TInt widthOfBarAndSpacer = aAxisRect.Width() / KAxisScaleFactor;

	// Iterate value model and draw bars.
	for (TInt i = 0; i < numElements; i++)
		{
		// Calculate height of bar based on input data
		TInt heightOfCurrentBar = (iShapesModel.ElementAt(i) * aAxisRect.Height()) / maxValue;
		originOfCurrentBar.iX += widthOfBarAndSpacer;

		TRect rectOfCurrentBar(
			TPoint(originOfCurrentBar.iX, (originOfCurrentBar.iY - heightOfCurrentBar)), 
			TPoint(originOfCurrentBar.iX + widthOfBarAndSpacer, originOfCurrentBar.iY)); 		
		
		// Generate a random color and set brush parameters
		const TInt randomColor = Math::Rand(colorSeed);		
		TRgb brushColor = AKN_LAF_COLOR(randomColor % KMaxColorValue);

		gc.SetBrushColor(brushColor);
		gc.SetBrushStyle(CGraphicsContext::ESolidBrush);
		
		// Draw Rectangle
		gc.DrawRect(rectOfCurrentBar);
		originOfCurrentBar.iX += widthOfBarAndSpacer;
		}	
	}

// End of File