[Coding] - Centering your text

[Alkatraz]

By Request ill explain first then show you how to impliment it:

When centering your text all you have to do is figure out how wide your string is then divide that by 2 and subtract that from the center of what ever your rendering it over. The width paramater can be defined by the string not just an object.

find your center:

center = x + (w/2)
stringlength = strlen(string) * 7 // 7 = the pixel width of the largest char when rendered(yours may be different)

so with those 2 you need to figure out where to place your text

textX = center - (stringlength / 2) // this way id subtract half the length of your string from the center of your object

my function i use: not 100 percent perfect but it gets the job done.

void CenterText( float x, float y, float w, char* Text, int r, int g, int b)
{
     float itextX = x + (w / 2) - strlen(Text)* 7.0f / 2;
     float itextY = y + 3.0f;
     MyDrawText(itextX, itextY, Text, r, g, b);
}

If anyone knows a better way please clue me in.

[Alkatraz]

Credits zoomgod


Here's how I do it using the actual font size, I store my fonts in an array so FontNum is just an index into it.

D3DXVECTOR2 getTextSize(int FontNum, const char* text)
{

    RECT _recA;
    
    _recA.left=0;
    _recA.top=0;
    _recA.bottom=500;
    _recA.right=500;
    
    // this does not render to screen
    fonts[FontNum]->DrawTextA(NULL, text, -1, &_recA, DT_CALCRECT, rgbYellow );

    D3DXVECTOR2 size;
    size.x = (float)_recA.right;
    size.y = (float)_recA.bottom;

    return size;

}

Knowing actual text width and height you then adjust from rendering position and they are right on the money.

[Alkatraz]

Credits R4z8r

VOID CDraw::Text_Center( char szString[], FLOAT PosX, FLOAT PosY, DWORD dwColor, ID3DXFont *MyFont)
{
	Text_Border( PosX - (Font.GetStringLengthInPixels( szString, MyFont ) / 2), PosY, dwColor, MyFont, szString ); 
}

INT CFont::GetStringLengthInPixels( char szString[], ID3DXFont* Font )
{
	TEXTMETRICA Met; 

	Font->GetTextMetrics( &Met );

	INT iStringSize = NULL;

	for(int i = 0; szString[i] != '\0'; i++)
		iStringSize++;

	return iStringSize * Met.tmAveCharWidth; 
}