GrCircleDraw(&sContext, 40, 105, 25);
GrContextFontSet(&sContext, &g_sFontCmss16);
GrStringDrawCentered(&sContext, "PWM2", -1, 40, 105, 0);
GrContextFontSet(&sContext, &g_sFontCmss26b);
GrStringDrawCentered(&sContext, sDutyCycle_PWM0, -1, 90, 105, 0);
GrStringDrawCentered(&sContext, "%", -1, 120, 105, 0);
以上程序里的数字代表什么啊?是 坐标么?