06-OpenGL字体显示.doc

OpenGL 字体显示在OpenGL中，提供了预定义的字库，可以满足一般的需求，用户也可以自定义字库，OpenGL红宝书中有自定义字库的详细过程。OpenGL预定义字库中提供了位图字符和矢量字符两种显示方式Void glutBitmapCharacter(void *font,int character);/位图字符其中font是GLUT常量，指定点阵字库，如:GLUT_BITMAP_8_BY_13,GLUT_BITMAP_9_BY_15,Void glutStrokeCharacter(void *font,int character);/矢量字符Font 的取值有glut_stroke_roman 等间距Roman Simplex 字体，glut_stroke_mono_roman 单一间距Roman Simplex 字体。本例演示了矢量字符的两种间距以及24磅位图字符的显示。显示效果：代码：#include #include #include int width = 200,height = 100;void init() glClearColor(0,0,0,0);void Reshape(int w,int h) width=w; height=h; glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0,width,0.0,height);void display() glClear(GL_COLOR_BUFFER_BIT); glColor3f(1.0f,1.0f,0.0f); glLineWidth(2.0); /设置笔画的大小 glTranslatef(0,250,0); /设置字符显示的位置，否则贴底显示不能完全显示部分字符 glutStrokeCharacter(GLUT_STROKE_ROMAN,79); /输出字体为GLUT_STROKE_ROMAN的OpenGL，从大写O开始，ASSCI码为79 glutStrokeCharacter(GLUT_STROKE_ROMAN,112); glutStrokeCharacter(GLUT_STROKE_ROMAN,101); glutStrokeCharacter(GLUT_STROKE_ROMAN,110); glutStrokeCharacter(GLUT_STROKE_ROMAN,71); glutStrokeCharacter(GLUT_STROKE_ROMAN,76); glTranslatef(-460,-150,0); /调整下一行显示的位置 glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,79); /输出字体为GLUT_STROKE_MONO_ROMAN的OpenGL，从大写O开始，ASSCI码为79 glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,112); glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,101); glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,110); glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,71); glutStrokeCharacter(GLUT_STROKE_MONO_ROMAN,76); glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,O); /显示24磅的times Roman 点阵字体 glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,p); glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,e); glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,n); glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,G); glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24,L); glutSwapBuffers();int main(int argc, char* argv)glutInit(&argc,argv);glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGB );glutInitWindowSize( 650, 400 );glutInitWindowPosition( 100,100 );glutCreateWindow(