void lcd_drawline(int x0, int y0, int x1, int y1, unsigned char color) {
int dy = y1 - y0;
int dx = x1 - x0;
int stepx, stepy;
if (dy < 0) {
dy = -dy;
stepy = -1;
}
else {
stepy = 1;
}
if (dx < 0) {
dx = -dx;
stepx = -1;
}
else {
stepx = 1;
}
dy <<= 1; // dy is now 2*dy
dx <<= 1; // dx is now 2*dx
lcd_drawpoint(x0, y0, color);
if (dx > dy) {
int fraction = dy - (dx >> 1); // same as 2*dy - dx
while (x0 != x1) {
if (fraction >= 0) {
y0 += stepy;
fraction -= dx; // same as fraction -= 2*dx
}
x0 += stepx;
fraction += dy; // same as fraction -= 2*dy
lcd_drawpoint(x0, y0, color);
}
}
void PutPixel(SHORT x, SHORT y) {
BYTE mask, display;
mask = 1; // Left shift 1 by bit position
/* Read data from display buffer*/
display = lcd_read_point(x ,y);
if(_color > 0) // If non-zero for pixel on
display |= mask; // or in mask
else // If 0 for pixel off
display &= ~mask; // and with inverted mask
lcd_drawpoint(x , y,display);
}
