void GLCD_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t color)
{
uint8_t deltax, deltay, x, y, steep;
int8_t error, ystep;
steep = _GLCD_absDiff(y1, y2) > _GLCD_absDiff(x1, x2);
if (steep) {
_GLCD_swap(x1, y1);
_GLCD_swap(x2, y2);
}
if (x1 > x2) {
_GLCD_swap(x1, x2);
_GLCD_swap(y1, y2);
}
deltax = x2 - x1;
deltay = _GLCD_absDiff(y2, y1);
error = deltax / 2;
y = y1;
if (y1 < y2) ystep = 1;
else ystep = -1;
for (x = x1; x <= x2; x++) {
if (steep) GLCD_SetDot(y, x, color);
else GLCD_SetDot(x, y, color);
error = error - deltay;
if (error < 0) {
y = y + ystep;
error = error + deltax;
}
}
}
void glcd::DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2,
uint8_t color) {
uint8_t deltax, deltay, x, y, steep;
int8_t error, ystep;
#ifdef XXX
/*
* Rather than fudge up coordinates that are outside of range,
* It is better to allow the algorithm to run with them "as is"
* so that any pixels on the line that land inside the valid display
* coordinates will be drawn properly.
*
* If the coordinates are patched, then the line drawn will not
* be anything close to the original slope as the endpoint coordinates
* will have been altered.
*/
if (x1 >= this->CurrentWidth())
x1 = 0;
if (x2 >= this->CurrentWidth())
x2 = 0;
if (y1 >= this->CurrentHeight())
y1 = 0;
if (y2 >= this->CurrentHeight())
y2 = 0;
#endif
steep = _GLCD_absDiff(y1, y2) > _GLCD_absDiff(x1, x2);
if (steep) {
_GLCD_swap(x1, y1);
_GLCD_swap(x2, y2);
}
if (x1 > x2) {
_GLCD_swap(x1, x2);
_GLCD_swap(y1, y2);
}
deltax = x2 - x1;
deltay = _GLCD_absDiff(y2, y1);
error = deltax / 2;
y = y1;
if (y1 < y2)
ystep = 1;
else
ystep = -1;
for (x = x1; x <= x2; x++) {
if (steep)
this->SetDot(y, x, color);
else
this->SetDot(x, y, color);
error = error - deltay;
if (error < 0) {
y = y + ystep;
error = error + deltax;
}
}
}
