void draw_line_antialias_(GBitmap* img, int16_t x1, int16_t y1, int16_t x2, int16_t y2, GColor8 color)
{
uint8_t* img_pixels = gbitmap_get_data(img);
int16_t w = gbitmap_get_bounds(img).size.w;
int16_t h = gbitmap_get_bounds(img).size.h;
fixed dx = int_to_fixed(abs_(x1 - x2));
fixed dy = int_to_fixed(abs_(y1 - y2));
bool steep = dy > dx;
if(steep){
swap_(x1, y1);
swap_(x2, y2);
}
if(x1 > x2){
swap_(x1, x2);
swap_(y1, y2);
}
dx = x2 - x1;
dy = y2 - y1;
fixed intery;
int x;
for(x=x1; x <= x2; x++) {
intery = int_to_fixed(y1) + (int_to_fixed(x - x1) * dy / dx);
if(x>=0){
if(steep){
_plot(img_pixels, w, h, ipart_(intery) , x, color, rfpart_(intery));
_plot(img_pixels, w, h, ipart_(intery) + 1, x, color, fpart_(intery));
}
else {
_plot(img_pixels, w, h, x, ipart_(intery) , color, rfpart_(intery));
_plot(img_pixels, w, h, x, ipart_(intery) + 1, color, fpart_(intery));
}
}
}
}
void ag_surface32__draw_line_aa(struct ag_surface32* img, struct ag_vec2i start, struct ag_vec2i end, struct ag_color32 color)
{
int x1 = start.x, x2 = end.x, y1 = start.y, y2 = end.y;
double dx = (double)x2 - (double)x1;
double dy = (double)y2 - (double)y1;
if ( fabs(dx) > fabs(dy) ) {
if ( x2 < x1 ) {
swap_(x1, x2);
swap_(y1, y2);
}
double gradient = dy / dx;
double xend = round_(x1);
double yend = y1 + gradient*(xend - x1);
double xgap = rfpart_(x1 + 0.5);
int xpxl1 = xend;
int ypxl1 = ipart_(yend);
plot_(xpxl1, ypxl1, rfpart_(yend)*xgap);
plot_(xpxl1, ypxl1+1, fpart_(yend)*xgap);
double intery = yend + gradient;
xend = round_(x2);
yend = y2 + gradient*(xend - x2);
xgap = fpart_(x2+0.5);
int xpxl2 = xend;
int ypxl2 = ipart_(yend);
plot_(xpxl2, ypxl2, rfpart_(yend) * xgap);
plot_(xpxl2, ypxl2 + 1, fpart_(yend) * xgap);
int x;
for(x=xpxl1+1; x <= (xpxl2-1); x++) {
plot_(x, ipart_(intery), rfpart_(intery));
plot_(x, ipart_(intery) + 1, fpart_(intery));
intery += gradient;
}
} else {
if ( y2 < y1 ) {
swap_(x1, x2);
swap_(y1, y2);
}
double gradient = dx / dy;
double yend = round_(y1);
double xend = x1 + gradient*(yend - y1);
double ygap = rfpart_(y1 + 0.5);
int ypxl1 = yend;
int xpxl1 = ipart_(xend);
plot_(xpxl1, ypxl1, rfpart_(xend)*ygap);
plot_(xpxl1, ypxl1+1, fpart_(xend)*ygap);
double interx = xend + gradient;
yend = round_(y2);
xend = x2 + gradient*(yend - y2);
ygap = fpart_(y2+0.5);
int ypxl2 = yend;
int xpxl2 = ipart_(xend);
plot_(xpxl2, ypxl2, rfpart_(xend) * ygap);
plot_(xpxl2, ypxl2 + 1, fpart_(xend) * ygap);
int y;
for(y=ypxl1+1; y <= (ypxl2-1); y++) {
plot_(ipart_(interx), y, rfpart_(interx));
plot_(ipart_(interx) + 1, y, fpart_(interx));
interx += gradient;
}
}
}
void MemoryImage::DrawLine(double x1, double y1, double x2, double y2, double color, Mode mode)
{
x1 *= m_oversample;
x2 *= m_oversample;
y1 *= m_oversample;
y2 *= m_oversample;
double dx = (double)x2 - (double)x1;
double dy = (double)y2 - (double)y1;
if (abs(dx) > abs(dy)) {
if (x2 < x1) {
swap(x1, x2);
swap(y1, y2);
}
double gradient = dy / dx;
double xend = round_(x1);
double yend = y1 + gradient*(xend - x1);
double xgap = rfpart_(x1 + 0.5);
int xpxl1 = xend;
int ypxl1 = ipart_(yend);
DrawPoint(xpxl1, ypxl1, color* rfpart_(yend)*xgap,mode);
DrawPoint(xpxl1, ypxl1 + 1, color* fpart_(yend)*xgap,mode);
double intery = yend + gradient;
xend = round_(x2);
yend = y2 + gradient*(xend - x2);
xgap = fpart_(x2 + 0.5);
int xpxl2 = xend;
int ypxl2 = ipart_(yend);
DrawPoint(xpxl2, ypxl2, color* rfpart_(yend) * xgap,mode);
DrawPoint(xpxl2, ypxl2 + 1, color* fpart_(yend) * xgap,mode);
int x;
for (x = xpxl1 + 1; x <= (xpxl2 - 1); x++) {
DrawPoint(x, ipart_(intery), color* rfpart_(intery),mode);
DrawPoint(x, ipart_(intery) + 1, color* fpart_(intery),mode);
intery += gradient;
}
}
else {
if (y2 < y1) {
swap(x1, x2);
swap(y1, y2);
}
double gradient = dx / dy;
double yend = round_(y1);
double xend = x1 + gradient*(yend - y1);
double ygap = rfpart_(y1 + 0.5);
int ypxl1 = yend;
int xpxl1 = ipart_(xend);
DrawPoint(xpxl1, ypxl1, color* rfpart_(xend)*ygap, mode);
DrawPoint(xpxl1, ypxl1 + 1, color* fpart_(xend)*ygap, mode);
double interx = xend + gradient;
yend = round_(y2);
xend = x2 + gradient*(yend - y2);
ygap = fpart_(y2 + 0.5);
int ypxl2 = yend;
int xpxl2 = ipart_(xend);
DrawPoint(xpxl2, ypxl2, color* rfpart_(xend) * ygap, mode);
DrawPoint(xpxl2, ypxl2 + 1, color* fpart_(xend) * ygap,mode);
int y;
for (y = ypxl1 + 1; y <= (ypxl2 - 1); y++) {
DrawPoint(ipart_(interx), y, color* rfpart_(interx),mode);
DrawPoint(ipart_(interx) + 1, y, color* fpart_(interx),mode);
interx += gradient;
}
}
}
void draw_line(
unsigned int x1, unsigned int y1,
unsigned int x2, unsigned int y2,
uint8_t r,
uint8_t g,
uint8_t b )
{
double dx = (double)x2 - (double)x1;
double dy = (double)y2 - (double)y1;
if ( fabs(dx) > fabs(dy) )
{
if ( x2 < x1 )
{
swap_(x1, x2);
swap_(y1, y2);
}
double gradient = dy / dx;
double xend = round_(x1);
double yend = y1 + gradient*(xend - x1);
double xgap = rfpart_(x1 + 0.5);
int xpxl1 = xend;
int ypxl1 = ipart_(yend);
dla_plot(xpxl1, ypxl1, r,g,b,rfpart_(yend)*xgap);
dla_plot(xpxl1, ypxl1+1, r,g,b,fpart_(yend)*xgap);
double intery = yend + gradient;
xend = round_(x2);
yend = y2 + gradient*(xend - x2);
xgap = fpart_(x2+0.5);
int xpxl2 = xend;
int ypxl2 = ipart_(yend);
dla_plot(xpxl2, ypxl2, r,g,b,rfpart_(yend) * xgap);
dla_plot(xpxl2, ypxl2 + 1, r,g,b,fpart_(yend) * xgap);
int x;
for(x=xpxl1+1; x <= (xpxl2-1); x++)
{
dla_plot(x, ipart_(intery), r,g,b,rfpart_(intery));
dla_plot(x, ipart_(intery) + 1, r,g,b,fpart_(intery));
intery += gradient;
}
}
else
{
if ( y2 < y1 )
{
swap_(x1, x2);
swap_(y1, y2);
}
double gradient = dx / dy;
double yend = round_(y1);
double xend = x1 + gradient*(yend - y1);
double ygap = rfpart_(y1 + 0.5);
int ypxl1 = yend;
int xpxl1 = ipart_(xend);
dla_plot(xpxl1, ypxl1, r,g,b,rfpart_(xend)*ygap);
dla_plot(xpxl1, ypxl1+1, r,g,b,fpart_(xend)*ygap);
double interx = xend + gradient;
yend = round_(y2);
xend = x2 + gradient*(yend - y2);
ygap = fpart_(y2+0.5);
int ypxl2 = yend;
int xpxl2 = ipart_(xend);
dla_plot(xpxl2, ypxl2, r,g,b,rfpart_(xend) * ygap);
dla_plot(xpxl2, ypxl2 + 1, r,g,b,fpart_(xend) * ygap);
int y;
for(y=ypxl1+1; y <= (ypxl2-1); y++)
{
dla_plot(ipart_(interx), y, r,g,b,rfpart_(interx));
dla_plot(ipart_(interx) + 1, y, r,g,b,fpart_(interx));
interx += gradient;
}
}
}