Windows游戏开发之Direct输出字体

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很多时候，在游戏中

我们都需要在界面上输出一些字体

现在来看看DirectX怎么输出字体

首先，声明全局变量

LPD3DXFONT font = NULL;

1	LPD3DXFONT font = NULL;

初始化font变量

D3DXFONT_DESC desc = {};
//desc.Height = 24;
//desc.Width = 0;
//desc.Weight = 0;
//desc.MipLevels = D3DX_DEFAULT;
//desc.Italic = FALSE;
//desc.CharSet = DEFAULT_CHARSET;
//desc.OutputPrecision = OUT_TT_ONLY_PRECIS;
//desc.Quality = CLIP_DEFAULT_PRECIS;
//desc.PitchAndFamily = DEFAULT_PITCH;
//strcpy_s(desc.FaceName, faceName.c_str());
D3DXCreateFontIndirect(d3ddev, &desc, &font);

if (font == NULL) {
	MessageBox(NULL, "font创建失败", "失败", MB_OK);
}

D3DXFONT_DESC desc = {};

//desc.Height = 24;

//desc.Width = 0;

//desc.Weight = 0;

//desc.MipLevels = D3DX_DEFAULT;

//desc.Italic = FALSE;

//desc.CharSet = DEFAULT_CHARSET;

//desc.OutputPrecision = OUT_TT_ONLY_PRECIS;

//desc.Quality = CLIP_DEFAULT_PRECIS;

//desc.PitchAndFamily = DEFAULT_PITCH;

//strcpy_s(desc.FaceName, faceName.c_str());

D3DXCreateFontIndirect(d3ddev, &desc, &font);

if (font == NULL) {

MessageBox(NULL, "font创建失败", "失败", MB_OK);

}

在这里主要的是字体的描述

D3DXCreateFontIndirect函数的寓意很明显

参数也很少，一看就知道

所以下面来看看用来描述字体的结构体

D3DXFONT_DESC

typedef struct D3DXFONT_DESC { INT   Height; UINT Width; UINT Weight; UINT MipLevels; BOOL Italic; BYTE CharSet; BYTE OutputPrecision; BYTE Quality; BYTE PitchAndFamily; TCHAR FaceName; } D3DXFONT_DESC, *LPD3DXFONT_DESC;

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typedef struct D3DXFONT_DESC {
  INT   Height;
  UINT Width;
  UINT Weight;
  UINT MipLevels;
  BOOL Italic;
  BYTE CharSet;
  BYTE OutputPrecision;
  BYTE Quality;
  BYTE PitchAndFamily;
  TCHAR FaceName;
} D3DXFONT_DESC, *LPD3DXFONT_DESC;

参数

* Height

Type: INT

字体单位高度

* Width

Type: UINT

字体单位宽度

*Weight

Type: UINT

字体粗度，范围（0,1000）

*MipLevels

Type: UINT

Number of mip levels requested. If this value is zero or D3DX_DEFAULT, a complete mipmap chain is created. If the value is 1, the texture space is mapped identically to the screen space.

*Italic

Type: BOOL

是否斜体

*CharSet

Type: BYTE

字体特征

*OutputPrecision

Type: BYTE

输出的精密度，尽量匹配字体设置

*Quality

Type: BYTE

输出质量

*PitchAndFamily

Type: BYTE

Pitch and family of the font.

FaceName

Type: TCHAR

指定字型名字，如果为空，就会匹配其他指定属性

由图片可以看出

整个结构体都是0

他告诉我们，当你需要某些功能效果时

就去指定某一属性，到时再查文档也不迟

最后就是输出了

代码

if (d3ddev->BeginScene()) {
	string text = "Hello World";
	RECT rect = { 100,10,200,200 };
		
	font->DrawTextW(NULL, L"Hello World", text.length(), &rect, DT_WORDBREAK, D3DCOLOR_XRGB(255, 255, 255));

	d3ddev->EndScene();
	d3ddev->Present(NULL, NULL, NULL, NULL);
}

if (d3ddev->BeginScene()) {

string text = "Hello World";

RECT rect = { 100,10,200,200 };

font->DrawTextW(NULL, L"Hello World", text.length(), &rect, DT_WORDBREAK, D3DCOLOR_XRGB(255, 255, 255));

d3ddev->EndScene();

d3ddev->Present(NULL, NULL, NULL, NULL);

}

主要的就是DrawTextW了

INT DrawText( [in] LPD3DXSPRITE pSprite, [in] LPCTSTR      pString, [in] INT          Count, [in] LPRECT       pRect, [in] DWORD        Format, [in] D3DCOLOR     Color );

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INT DrawText(
  [in] LPD3DXSPRITE pSprite,
  [in] LPCTSTR      pString,
  [in] INT          Count,
  [in] LPRECT       pRect,
  [in] DWORD        Format,
  [in] D3DCOLOR     Color
);

Parameters

pSprite [in]

Type: LPD3DXSPRITE

Pointer to an ID3DXSprite object that contains the string. Can be NULL, in which case Direct3D will render the string with its own sprite object. To improve efficiency, a sprite object should be specified if DrawText is to be called more than once in a row.

pString [in]

Type: LPCTSTR

要输出的字符串

Count [in]

Type: INT

字符串的长度

pRect [in]

Type: LPRECT

渲染字体的矩形区域

Format [in]

Type: DWORD

Specifies the method of formatting the text. It can be any combination of the following values:

Value Meaning

DT_BOTTOM

Justifies the text to the bottom of the rectangle. This value must be combined with DT_SINGLELINE.

DT_CALCRECT

Determines the width and height of the rectangle. If there are multiple lines of text, DrawText uses the width of the rectangle pointed to by the pRect parameter and extends the base of the rectangle to bound the last line of text. If there is only one line of text, DrawText modifies the right side of the rectangle so that it bounds the last character in the line. In either case, DrawText returns the height of the formatted text but does not draw the text.

DT_CENTER

Centers text horizontally in the rectangle.

DT_EXPANDTABS

Expands tab characters. The default number of characters per tab is eight.

DT_LEFT

Aligns text to the left.

DT_NOCLIP

Draws without clipping. DrawText is somewhat faster when DT_NOCLIP is used.

DT_RIGHT

Aligns text to the right.

DT_RTLREADING

Displays text in right-to-left reading order for bidirectional text when a Hebrew or Arabic font is selected. The default reading order for all text is left-to-right.

DT_SINGLELINE

Displays text on a single line only. Carriage returns and line feeds do not break the line.

DT_TOP

Top-justifies text.

DT_VCENTER

Centers text vertically (single line only).

DT_WORDBREAK

Breaks words. Lines are automatically broken between words if a word would extend past the edge of the rectangle specified by the pRect parameter. A carriage return/line feed sequence also breaks the line.

Color [in]

Type: D3DCOLOR

字体的颜色

Value	Meaning
DT_BOTTOM	Justifies the text to the bottom of the rectangle. This value must be combined with DT_SINGLELINE.
DT_CALCRECT	Determines the width and height of the rectangle. If there are multiple lines of text, DrawText uses the width of the rectangle pointed to by the pRect parameter and extends the base of the rectangle to bound the last line of text. If there is only one line of text, DrawText modifies the right side of the rectangle so that it bounds the last character in the line. In either case, DrawText returns the height of the formatted text but does not draw the text.
DT_CENTER	Centers text horizontally in the rectangle.
DT_EXPANDTABS	Expands tab characters. The default number of characters per tab is eight.
DT_LEFT	Aligns text to the left.
DT_NOCLIP	Draws without clipping. DrawText is somewhat faster when DT_NOCLIP is used.
DT_RIGHT	Aligns text to the right.
DT_RTLREADING	Displays text in right-to-left reading order for bidirectional text when a Hebrew or Arabic font is selected. The default reading order for all text is left-to-right.
DT_SINGLELINE	Displays text on a single line only. Carriage returns and line feeds do not break the line.
DT_TOP	Top-justifies text.
DT_VCENTER	Centers text vertically (single line only).
DT_WORDBREAK	Breaks words. Lines are automatically broken between words if a word would extend past the edge of the rectangle specified by the pRect parameter. A carriage return/line feed sequence also breaks the line.

参数

Parameters

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