/*
x,y Upper left position of the line
len length of the line in pixel, len must not be 0
dir 0: horizontal line (left to right)
1: vertical line (top to bottom)
*/
static void u8g2_draw_hv_line(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir)
{
u8g2_uint_t a;
if ( dir == 0 )
{
if ( y < u8g2->buf_y0 )
return;
if ( y >= u8g2->buf_y1 )
return;
a = x;
a += len;
if ( u8g2_clip_intersection(&x, &a, u8g2->buf_x0, u8g2->buf_x1) == 0 )
return;
len = a;
len -= x;
}
else
{
if ( x < u8g2->buf_x0 )
return;
if ( x >= u8g2->buf_x1 )
return;
a = y;
a += len;
if ( u8g2_clip_intersection(&y, &a, u8g2->buf_y0, u8g2->buf_y1) == 0 )
return;
len = a;
len -= y;
}
u8g2_unsafe_draw_hv_line(u8g2, x, y, len, dir);
}
/*
x,y Upper left position of the line
len length of the line in pixel, len must not be 0
dir 0: horizontal line (left to right)
1: vertical line (top to bottom)
This function first adjusts the y position to the local buffer. Then it
will clip the line and call u8g2_draw_low_level_hv_line()
*/
static void u8g2_draw_hv_line_2dir(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir)
{
u8g2_uint_t a;
register u8g2_uint_t w, h;
y -= u8g2->tile_curr_row*8;
h = u8g2->pixel_buf_height; // this must be the real buffer height
w = u8g2->pixel_buf_width; // this could be replaced by u8g2->u8x8.display_info->pixel_width
if ( dir == 0 )
{
if ( y >= h )
return;
a = x;
a += len;
if ( u8g2_clip_intersection(&x, &a, w) == 0 )
return;
len = a;
len -= x;
}
else
{
if ( x >= w )
return;
a = y;
a += len;
if ( u8g2_clip_intersection(&y, &a, h) == 0 )
return;
len = a;
len -= y;
}
u8g2->ll_hvline(u8g2, x, y, len, dir);
//u8g2_draw_low_level_hv_line(u8g2, x, y, len, dir);
}