void TextFade::draw_text(clan::Canvas &canvas, clan::Font &font, int ypos, const char *text)
{
// For this example, to keep things simple, we only handle ASCII characters
int gc_width = canvas.get_width();
clan::Size text_size = clan::Size(font.measure_text(canvas, text).bbox_size);
int xpos = (gc_width - text_size.width) / 2;
while(*text)
{
char let = *(text++);
char buffer[2];
buffer[0] = let;
buffer[1] = 0;
int position_off_centre = (gc_width/2) - xpos;
if (position_off_centre < 0)
position_off_centre = -position_off_centre;
float alpha = 1.0f - ( (float) position_off_centre * 2.0f / gc_width );
if (alpha > 0.0f)
font.draw_text(canvas, xpos, ypos, buffer, clan::Colorf(0.4f, 0.4f, 1.0f, alpha));
xpos += font.get_metrics(canvas, let).bbox_size.width;
}
}
