摘要
分析了几种常用的文字绘制方法,研究了文字的属性特征,提出了GDI和OpenGL相结合的文字绘制方法,前者负责文字位图的创建,后者负责文字位图的绘制。在绘制过程中,使用纹理贴图的方式,将位图转换为几何图形的纹理,通过对几何图形的操作,间接达到文字的放大、缩小、旋转、变形的绘制效果。使用C++语言设计出了位图文字和纹理文字的绘制类,可以方便地设置所绘文字的内容、字体、颜色、位置、对齐方式、旋转角度、放大倍数、变形系数等参数。该方法具有通用性、灵活性、易用性的特点。
This paper analyzes several commonly used methods of text rendering,studies the properties of the text,and putsforward the method of combining GDI and OpenGL. The former is responsible for the creation of text bitmap,and the latter is respon-sible for the rendering of the bitmap. In the drawing process,the use of texture mapping can convert the bitmap into a geometric tex-ture,and the operation of the geometric figure can indirectly achieve the rendering effect of text to zoom,rotate and deform. By us-ing C++ to design bitmap text and texture text rendering classes,the contents,font,color,position,alignment,rotation angle,magnification,deformation coefficient and other parameters of the painted text can be easily set. The method has the characteristicsof generality,flexibility and ease of use.
引文
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