diff options
Diffstat (limited to 'plugingui/painter.cc')
| -rw-r--r-- | plugingui/painter.cc | 179 |
1 files changed, 178 insertions, 1 deletions
diff --git a/plugingui/painter.cc b/plugingui/painter.cc index 025363c..b74952f 100644 --- a/plugingui/painter.cc +++ b/plugingui/painter.cc @@ -49,6 +49,107 @@ void GUI::Painter::setColour(Colour colour) this->colour = colour; } +void GUI::Painter::plot(int x, int y, double c) +{ + // plot the pixel at (x, y) with brightness c (where 0 ≤ c ≤ 1) + + //c += 0.5; + //if(c > 1) c = 1; + + pixbuf->addPixel(x, y, + (unsigned char)(colour.red * 255.0), + (unsigned char)(colour.green * 255.0), + (unsigned char)(colour.blue * 255.0), + (unsigned char)(colour.alpha * 255 * c)); + +} + +#include <math.h> +double GUI::Painter::ipart(double x) +{ + return floor(x); //integer part of x' +} + +double GUI::Painter::round(double x) +{ + return ipart(x + 0.5); +} + +double GUI::Painter::fpart(double x) +{ + return x - ipart(x);//'fractional part of x' +} + +double GUI::Painter::rfpart(double x) +{ + return 1 - fpart(x); +} + + +#define SWAP(x, y) { int tmp = x; x = y; y = tmp; } +void GUI::Painter::drawLine(int x0, int y0, int x1, int y1) +{ + bool steep = abs(y1 - y0) > abs(x1 - x0); + + if(steep) { + SWAP(x0, y0); + SWAP(x1, y1); + } + if(x0 > x1) { + SWAP(x0, x1); + SWAP(y0, y1); + } + + double dx = x1 - x0; + double dy = y1 - y0; + double gradient = dy / dx; + + // handle first endpoint + double xend = round(x0); + double yend = y0 + gradient * (xend - x0); + double xgap = rfpart(x0 + 0.5); + double xpxl1 = xend; //this will be used in the main loop + double ypxl1 = ipart(yend); + if(steep) { + plot(ypxl1, xpxl1, rfpart(yend) * xgap); + plot(ypxl1+1, xpxl1, fpart(yend) * xgap); + } else { + plot(xpxl1, ypxl1 , rfpart(yend) * xgap); + plot(xpxl1, ypxl1+1, fpart(yend) * xgap); + } + double intery = yend + gradient; // first y-intersection for the main loop + + // handle second endpoint + + xend = round(x1); + yend = y1 + gradient * (xend - x1); + xgap = fpart(x1 + 0.5); + double xpxl2 = xend; //this will be used in the main loop + double ypxl2 = ipart(yend); + if(steep) { + plot(ypxl2 , xpxl2, rfpart(yend) * xgap); + plot(ypxl2+1, xpxl2, fpart(yend) * xgap); + } else { + plot(xpxl2, ypxl2, rfpart(yend) * xgap); + plot(xpxl2, ypxl2+1, fpart(yend) * xgap); + } + + // main loop + for(int x = xpxl1 + 1; x <= xpxl2 - 1; x++) { + if(steep) { + plot(ipart(intery) , x, rfpart(intery)); + plot(ipart(intery)+1, x, fpart(intery)); + } else { + plot(x, ipart (intery), rfpart(intery)); + plot(x, ipart (intery)+1, fpart(intery)); + } + intery += gradient; + } +} +///////////////////////////////////////////// + +/* +// No antialiasing void GUI::Painter::drawLine(int x0, int y0, int x1, int y1) { int dx = abs(x1 - x0); @@ -78,6 +179,7 @@ void GUI::Painter::drawLine(int x0, int y0, int x1, int y1) } } } +*/ void GUI::Painter::drawRectangle(int x1, int y1, int x2, int y2) { @@ -123,6 +225,80 @@ void GUI::Painter::drawPoint(int x, int y) (unsigned char)(colour.alpha * 255.0)); } +#if 0 +static double distance(double r, double y) +{ + double real_point = sqrt(pow(r, 2) - pow(y, 2)); + return ceil(real_point) - real_point; +} + +double new_color(double i) { + return i * 127; +} + +void GUI::Painter::drawCircle(int cx, int cy, double radius) +{ + // wu_circle($image, $r, $color, $offset_x = null, $offset_y = null) { + //$red = $color["red"]; + //$green = $color["green"]; + //$blue = $color["blue"]; + int offset_x = cx; + int offset_y = cy; + int x = radius; + // int xx = radius; + int y = -1; + // int yy = -1; + double t = 0; + //$color = imagecolorallocate($image, $red, $green, $blue); + while(x > y) { + y++; + double current_distance = distance(radius, y); + if(current_distance < t) { + x--; + } + + double trasparency = new_color(current_distance); + double alpha = trasparency; + double alpha2 = 127.0 - trasparency; + + double color = 1; + + plot(x + offset_x, y + offset_y, color); + plot(x + offset_x - 1, y + offset_y, alpha2 ); + plot(x + offset_x + 1, y + offset_y, alpha ); + + plot(y + offset_x, x + offset_y, color); + plot(y + offset_x, x + offset_y - 1, alpha2); + plot(y + offset_x, x + offset_y + 1, alpha); + + plot(offset_x - x , y + offset_y, color); + plot(offset_x - x + 1, y + offset_y, alpha2); + plot(offset_x - x - 1, y + offset_y, alpha); + + plot(offset_x - y, x + offset_y, color); + plot(offset_x - y, x + offset_y - 1, alpha2); + plot(offset_x - y, x + offset_y + 1, alpha); + + plot(x + offset_x, offset_y - y, color); + plot(x + offset_x - 1, offset_y - y, alpha2); + plot(x + offset_x + 1, offset_y - y, alpha); + + plot(y + offset_x, offset_y - x, color); + plot(y + offset_x, offset_y - x - 1, alpha); + plot(y + offset_x, offset_y - x + 1, alpha2); + + plot(offset_x - y, offset_y - x, color); + plot(offset_x - y, offset_y - x - 1, alpha); + plot(offset_x - y, offset_y - x + 1, alpha2); + + plot(offset_x - x, offset_y - y, color); + plot(offset_x - x - 1, offset_y - y, alpha); + plot(offset_x - x + 1, offset_y - y, alpha2); + + t = current_distance; + } +} +#else static void plot4points(GUI::Painter *p, int cx, int cy, int x, int y) { p->drawPoint(cx + x, cy + y); @@ -131,7 +307,7 @@ static void plot4points(GUI::Painter *p, int cx, int cy, int x, int y) if(x != 0 && y != 0) p->drawPoint(cx - x, cy - y); } -void GUI::Painter::drawCircle(int cx, int cy, int radius) +void GUI::Painter::drawCircle(int cx, int cy, double radius) { int error = -radius; int x = radius; @@ -152,6 +328,7 @@ void GUI::Painter::drawCircle(int cx, int cy, int radius) } } } +#endif static void plot4lines(GUI::Painter *p, int cx, int cy, int x, int y) { |