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Pixels_Antialiasing.h
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Pixels_Antialiasing.h
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/*
* Pixels. Graphics library for TFT displays.
*
* Copyright (C) 2012-2013 Igor Repinetski
*
* The code is written in C/C++ for Arduino and can be easily ported to any microcontroller by rewritting the low level pin access functions.
*
* Text output methods of the library rely on Pixelmeister's font data format. See: http://pd4ml.com/pixelmeister
*
* This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
*
* Commercial use of the library is possible for licensees of "Pixelmeister (for industry)" product.
*
* This library includes some code portions and algoritmic ideas derived from works of
* - Andreas Schiffler -- aschiffler at ferzkopp dot net (SDL_gfx Project)
* - K. Townsend http://microBuilder.eu (lpc1343codebase Project)
*/
#include "Pixels.h"
#ifdef PIXELS_MAIN
#error Pixels_Antialiasing.h must be included before Pixels_<CONTROLLER>.h
#endif
#ifndef PIXELS_ANTIALIASING_H
#define PIXELS_ANTIALIASING_H
class PixelsAntialiased : public PixelsBase {
protected:
virtual void drawCircleAntialiaced(int16_t x, int16_t y, int16_t radius, boolean bordermode);
virtual void drawFatLineAntialiased(int16_t x1, int16_t y1, int16_t x2, int16_t y2);
virtual void drawLineAntialiased(int16_t x1, int16_t y1, int16_t x2, int16_t y2);
virtual void drawRoundRectangleAntialiased(int16_t x, int16_t y, int16_t width, int16_t height, int16_t rx, int16_t ry, boolean bordermode);
public:
virtual void enableAntialiasing(boolean enable) {
antialiasing = enable;
}
PixelsAntialiased(uint16_t width, uint16_t height) : PixelsBase( width, height) {
}
};
void PixelsAntialiased::drawLineAntialiased(int16_t x1, int16_t y1, int16_t x2, int16_t y2) {
boolean steep = (y2 > y1 ? y2 - y1 : y1 - y2) > (x2 > x1 ? x2 - x1 : x1 - x2);
if (steep) {
int16_t tmp = x1;
x1 = y1;
y1 = tmp;
tmp = x2;
x2 = y2;
y2 = tmp;
}
if (x1 > x2) {
int16_t tmp = x1;
x1 = x2;
x2 = tmp;
tmp = y1;
y1 = y2;
y2 = tmp;
}
int16_t deltax = x2 - x1;
int16_t deltay = y2 - y1;
double gradient = 1.0 * deltay / deltax;
int16_t xend = x1; // round(x1);
double yend = y1 + gradient * (xend - x1);
double xgap = rfpart(x1 + 0.5);
int16_t xpxl1 = xend;
int16_t ypxl1 = ipart(yend);
putColor(xpxl1, ypxl1, steep, rfpart(yend)*xgap);
putColor(xpxl1, ypxl1 + 1, steep, fpart(yend)*xgap);
double intery = yend + gradient;
xend = x2; // round(x2);
yend = y2 + gradient * (xend - x2);
xgap = rfpart(x2 + 0.5);
int16_t xpxl2 = xend;
int16_t ypxl2 = ipart(yend);
putColor(xpxl2, ypxl2, steep, rfpart(yend)*xgap);
putColor(xpxl2, ypxl2 + 1, steep, fpart(yend)*xgap);
for ( int16_t x = xpxl1 + 1; x < xpxl2 - 1; x++ ) {
putColor(x, ipart(intery), steep, rfpart(intery));
putColor(x, ipart(intery) + 1, steep, fpart(intery));
intery += gradient;
}
}
void PixelsAntialiased::drawFatLineAntialiased(int16_t x1, int16_t y1, int16_t x2, int16_t y2) {
#ifdef ENABLE_FAT_LINES
// the code still needs to be completed. Problems by line caps
double wd = lineWidth;
int16_t dx = abs(x2 - x1);
int16_t sx = x1 < x2 ? 1 : -1;
int16_t dy = abs(y2 - y1);
int16_t sy = y1 < y2 ? 1 : -1;
int16_t err = dx - dy;
int16_t e2;
int16_t x;
int16_t y;
double ed = dx + dy == 0 ? 1 : sqrt((double) dx * dx + (double) dy * dy);
wd = (wd + 1) / 2;
while ( true ) {
putColor(x1, y1, false, 1 - max(0, abs(err-dx+dy)/ed - wd + 1));
e2 = err;
x = x1;
boolean out = false;
if (2 * e2 >= -dx) { /* x step */
for (e2 += dy, y = y1; e2 < ed * wd && (y2 != y || dx > dy); e2 += dx) {
putColor(x1, y += sy, false, 1 - max(0, abs(e2)/ed - wd + 1));
}
if (x1 == x2) {
out = true;
}
e2 = err;
err -= dy;
x1 += sx;
}
if (2 * e2 <= dy) { /* y step */
for (e2 = dx - e2; e2 < ed * wd && (x2 != x || dx < dy); e2 += dy) {
putColor(x += sx, y1, false, 1 - max(0, abs(e2)/ed - wd + 1));
}
if (y1 == y2) {
out = true;
}
err += dx;
y1 += sy;
}
if ( out ) {
break;
}
}
#else
drawLineAntialiased(x1, y1, x2, y2);
#endif
}
void PixelsAntialiased::drawRoundRectangleAntialiased(int16_t x, int16_t y, int16_t width, int16_t height, int16_t rx, int16_t ry, boolean bordermode) {
int16_t i;
int32_t a2, b2, ds, dt, dxt, t, s, d;
int16_t xp, yp, xs, ys, dyt, od, xx, yy, xc2, yc2;
float cp;
double sab;
double weight, iweight;
if ((rx < 0) || (ry < 0)) {
return;
}
if (rx == 0) {
vLine(x, y - ry, y + ry);
return;
}
if (ry == 0) {
hLine(x - rx, y, x + rx);
return;
}
a2 = rx * rx;
b2 = ry * ry;
ds = a2 << 1;
dt = b2 << 1;
xc2 = x << 1;
yc2 = y << 1;
sab = sqrt((double)(a2 + b2));
od = (int)iround(sab*0.01) + 1;
dxt = (int)iround((double)a2 / sab) + od;
t = 0;
s = -2 * a2 * ry;
d = 0;
xp = x + rx;
yp = y;
hLine(x + rx, y + height, x + width - rx);
hLine(x + rx, y, x + width - rx );
vLine(x + width, y + ry, y + height - ry);
vLine(x, y + ry, y + height - ry);
for (i = 1; i <= dxt; i++) {
xp--;
d += t - b2;
if (d >= 0) {
ys = yp - 1;
} else if ((d - s - a2) > 0) {
if (((d << 1) - s - a2) >= 0) {
ys = yp + 1;
} else {
ys = yp;
yp++;
d -= s + a2;
s += ds;
}
} else {
yp++;
ys = yp + 1;
d -= s + a2;
s += ds;
}
t -= dt;
if (s != 0) {
cp = (float) abs(d) / (float) abs(s);
if (cp > 1.0) {
cp = 1.0f;
}
} else {
cp = 1.0f;
}
weight = cp;
iweight = 1 - weight;
if( bordermode ) {
iweight = yp > ys ? 1 : iweight;
weight = ys > yp ? 1 : weight;
}
/* Upper half */
xx = xc2 - xp;
putColor(xp, yp, false, iweight);
putColor(xx+width, yp, false, iweight);
putColor(xp, ys, false, weight );
putColor(xx+width, ys, false, weight);
/* Lower half */
yy = yc2 - yp;
putColor(xp, yy+height, false, iweight);
putColor(xx+width, yy+height, false, iweight);
yy = yc2 - ys;
putColor(xp, yy+height, false, weight);
putColor(xx+width, yy+height, false, weight);
}
/* Replaces original approximation code dyt = abs(yp - yc); */
dyt = (int)iround((double)b2 / sab ) + od;
for (i = 1; i <= dyt; i++) {
yp++;
d -= s + a2;
if (d <= 0) {
xs = xp + 1;
} else if ((d + t - b2) < 0) {
if (((d << 1) + t - b2) <= 0) {
xs = xp - 1;
} else {
xs = xp;
xp--;
d += t - b2;
t -= dt;
}
} else {
xp--;
xs = xp - 1;
d += t - b2;
t -= dt;
}
s += ds;
if (t != 0) {
cp = (float) abs(d) / (float) abs(t);
if (cp > 1.0) {
cp = 1.0f;
}
} else {
cp = 1.0f;
}
weight = cp;
iweight = 1 - weight;
/* Left half */
xx = xc2 - xp;
yy = yc2 - yp;
putColor(xp, yp, false, iweight);
putColor(xx+width, yp, false, iweight);
putColor(xp, yy+height, false, iweight);
putColor(xx+width, yy+height, false, iweight);
/* Right half */
xx = xc2 - xs;
putColor(xs, yp, false, weight);
putColor(xx+width, yp, false, weight);
putColor(xs, yy+height, false, weight);
putColor(xx+width, yy+height, false, weight);
}
}
void PixelsAntialiased::drawCircleAntialiaced( int16_t x, int16_t y, int16_t radius, boolean bordermode ) {
drawRoundRectangleAntialiased(x-radius, y-radius, radius<<1, radius<<1, radius, radius, bordermode);
}
#endif