1 .手机屏幕尺寸为 w = 240 h = 320，现提供LCD BUF(type:unsigned short)的起始地址为lcdbuff。要求从坐标(100,10)处开始绘制一条长度为300的黑色(颜色值为0)垂直线。

参考代码：



2 .在第1题的基础上封装一个画垂直线的函数，不考虑颜色。

参考代码：



3 .在第1题的基础上封装一个画水平线的函数，颜色可不考虑。

参考代码：

-The start address of a mobile phone screen size w = 240 h = 320, and now the LCD BUF (type: unsigned short) lcdbuff. Required to start drawing from the coordinates (100,10) at a length of 300 black (color = 0) vertical line. The reference code: 2 encapsulated in the question 1 on the basis of a painting a function of the vertical line, without regard to color. Reference code: package in question 1 on the basis of a painting of a function of the horizon, time to consider color. Reference code: