graphics.c

一个测试LCD的应用程序

#include "ra8815.h"		// Include basic LCD driver

bit iPoint = 1;		// Global variable for Turn on/off point

// Information for drawing a rectangle
struct RectInfo
{
	uint8 X0,Y0,X1,Y1;
};

// Display an image at the specific position of the screen
void disp_image(uint8 code *ptrImage, uint8 X0, Y0)
{
	uint8 i, k;
	uint8 PageHold;
	uint8 width = *ptrImage++;
	uint8 height = *ptrImage++;
	
	if (width%8 != 0)
		PageHold = width/8 + 1;
	else
		PageHold = width/8;
		
	for (k = Y0; k < Y0 + height; k++)
	{
		Gotoxy(X0, k);
		for (i = 0; i < PageHold; i++)
		{
			WriteData(*ptrImage++);
		}
	}
}

// Display a picture on the upleft corner of LCD Screen
void disp_upleft(uint8 code *ptrImage)
{
	disp_image(ptrImage, 0, 0);
}

// Display a picture on the center of LCD Screen
void disp_center(uint8 code *ptrImage)
{
	uint8 width = *ptrImage;	// Image width
	uint8 height = *(ptrImage + 1);	// Image height
	uint8 PageHold;		// pages the image holds
	uint8 StartX;		// Start Page
	uint8 StartY;		// Start Column
	
	if (width%8 != 0)
		PageHold = width/8 + 1;
	else
		PageHold = width/8;
	
	if ((X_MAX/8 + PageHold)%2 != 0)
		StartX = (X_MAX/8 - PageHold)/2 + 1;
	else
		StartX = (X_MAX/8 - PageHold)/2;
	StartY = (Y_MAX - height)/2;
	
	disp_image(ptrImage, StartX, StartY);
}

// Draw a point at specific coordinate
void Point(uint8 Xpoint, uint8 Ypoint)
{
	uint8 xUnit;
	uint8 OldData;
	uint8 NewData;
	
	xUnit = Xpoint/8;
	OldData = ReadData(xUnit, Ypoint);
	
	Gotoxy(xUnit, Ypoint);
	if (iPoint)
	{
		// Turn on a point
		NewData = 0x01 << (Xpoint%8);
		WriteData(OldData|NewData);
	}
	else
	{
		// Turn off a point
		NewData = ~(0x01 << (Xpoint%8));
		WriteData(OldData & NewData);
	}
}

// Draw a horizontal line
void LineH(uint8 X0, uint8 Y0, uint8 Length)
{
	uint8 i;
	for (i = X0; i <= X0 + Length; i++)
	{
		Point(i, Y0);
	}
}

// Draw a Virtical line
void LineV(uint8 X0, uint8 Y0, uint8 Height)
{
	uint8 i;
	for (i = Y0; i <= Y0 + Height; i++)
	{
		Point(X0, i);
	}
}

// Draw a table with specific rows and cols
void Table(uint8 Rows, Cols, uint8 width, height)
{
	uint8 i;
	
	for (i = 0; i <= Rows; i++)
	{
		if ((Rows*height == Y_MAX) && (i == Rows))
			LineH(0, i*height - 1, Cols*width);
		else
			LineH(0, i*height, Cols*width);
	}
	for (i = 0; i <= Cols; i++)
	{
		if ((Cols*width == X_MAX) && (i == Cols))
			LineV(i*width - 1, 0, Rows*height);
		else
			LineV(i*width, 0, Rows*height);
	}
}

// Scan Vertical line
void ScanV(uint8 Tscan)
{
	uint8 i;
	for (i = 0; i < X_MAX; i += 2)
	{
		LineV(i, 0, Y_MAX);
		DelayMs(Tscan);
	}
}

// Scan each line
void ScanH(uint8 Tscan)
{
	uint8 i;
	for (i = 0; i < Y_MAX; i += 2)
	{
		LineH(0, i, X_MAX);
		DelayMs(Tscan);
	}
}

// Draw a Rectangle
void Rectangle(struct RectInfo Points)
{
	LineH(Points.X0, Points.Y0, Points.X0 - Points.X1);
	LineH(Points.X0, Points.Y1, Points.X0 - Points.X1);
	LineV(Points.X0, Points.Y1, Points.Y0 - Points.Y1);
	LineV(Points.X1, Points.Y1, Points.Y0 - Points.Y1);
}

// Show x frames on the screen
void frameShow(uint8 xframes)
{
	struct RectInfo OriginRect;
	OriginRect.X0 = X_MAX/2 - 10;
	OriginRect.Y0 = Y_MAX/2 + 5;
	OriginRect.X1 = X_MAX/2 + 10;
	OriginRect.Y1 = Y_MAX/2 - 5;
	
	while(xframes-- != 0)
	{
		Rectangle(OriginRect);
		OriginRect.X0 += 4;
		OriginRect.Y0 += 2;
		OriginRect.X1 -= 4;
		OriginRect.Y1 -= 2;	
	}
}

// Draw a fullscreen rectangle
void RectFullscreen(void)
{
	LineH(0, 0, X_MAX);
	LineH(0, Y_MAX - 1, X_MAX);
	LineV(0, 0, Y_MAX);
	LineV(X_MAX - 1, 0, Y_MAX);
}