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VGAXUtils.h
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VGAXUtils.h
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/*
Utils for VGAX Library
COPYRIGHT (C) 2014 Sandro Maffiodo
http://www.assezeta.com/sandromaffiodo
Some of these methods are from TVOut library created by Myles Metzer (thank you!)
https://code.google.com/p/arduino-tvout/
*/
#ifndef __VGAX_utils__
#define __VGAX_utils__
#include <VGAX.h>
class VGAXUtils {
public:
//porting of TVOut::draw_line method, writen by Myles Metzer
static inline void draw_line(uint8_t x0, uint8_t y0,
uint8_t x1, uint8_t y1, uint8_t c) {
if (x0>VGAX_WIDTH || y0>VGAX_HEIGHT || x1>VGAX_WIDTH || y1>VGAX_HEIGHT)
return;
if (x0==x1)
VGAXUtils::draw_column(x0, y0, y1, c);
else if (y0==y1)
VGAXUtils::draw_row(y0, x0, x1, c);
else {
int e;
signed int dx, dy, j, temp;
signed char s1, s2, xchange;
signed int x, y;
x=x0;
y=y0;
//take absolute value
if (x1<x0) {
dx=x0-x1;
s1=-1;
} else if (x1==x0) {
dx=0;
s1=0;
} else {
dx=x1-x0;
s1=1;
}
if (y1<y0) {
dy=y0-y1;
s2=-1;
} else if (y1==y0) {
dy=0;
s2=0;
} else {
dy=y1-y0;
s2=1;
}
xchange=0;
if (dy>dx) {
temp=dx;
dx=dy;
dy=temp;
xchange=1;
}
e=((int)dy<<1)-dx;
for (j=0; j<=dx; j++) {
VGAX::putpixel(x, y, c);
if (e>=0) {
if (xchange==1)
x=x+s1;
else
y=y+s2;
e=e-((int)dx<<1);
}
if (xchange==1)
y=y+s2;
else
x=x+s1;
e=e+((int)dy<<1);
}
}
}
//porting of TVOut::draw_circle method, writen by Myles Metzer
static inline void draw_circle(uint8_t x0, uint8_t y0,
uint8_t radius, uint8_t c, char fc) {
int f=1-radius;
int ddF_x=1;
int ddF_y=-2 * radius;
int x=0;
int y=radius;
uint8_t pyy=y, pyx=x;
//there is a fill color
if (fc!=-1)
VGAXUtils::draw_row(y0, x0-radius, x0+radius, fc);
VGAX::putpixel(x0, y0+radius, c);
VGAX::putpixel(x0, y0-radius, c);
VGAX::putpixel(x0+radius, y0, c);
VGAX::putpixel(x0-radius, y0, c);
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
//there is a fill color
if (fc != -1) {
//prevent double draws on the same rows
if (pyy != y) {
VGAXUtils::draw_row(y0+y, x0-x, x0+x, fc);
VGAXUtils::draw_row(y0-y, x0-x, x0+x, fc);
}
if (pyx != x && x != y) {
VGAXUtils::draw_row(y0+x, x0-y, x0+y, fc);
VGAXUtils::draw_row(y0-x, x0-y, x0+y, fc);
}
pyy=y;
pyx=x;
}
VGAX::putpixel(x0+x, y0+y, c);
VGAX::putpixel(x0-x, y0+y, c);
VGAX::putpixel(x0+x, y0-y, c);
VGAX::putpixel(x0-x, y0-y, c);
VGAX::putpixel(x0+y, y0+x, c);
VGAX::putpixel(x0-y, y0+x, c);
VGAX::putpixel(x0+y, y0-x, c);
VGAX::putpixel(x0-y, y0-x, c);
}
}
//porting of TVOut::draw_rect method, writen by Myles Metzer
static inline void draw_rect(uint8_t x0, uint8_t y0, uint8_t w, uint8_t h,
uint8_t c, char fc) {
if (fc != -1) {
for (unsigned char i=y0; i < y0+h; i++) {
VGAXUtils::draw_row(i, x0, x0+w, fc);
}
}
VGAXUtils::draw_line(x0, y0, x0+w, y0, c);
VGAXUtils::draw_line(x0, y0, x0, y0+h, c);
VGAXUtils::draw_line(x0+w, y0, x0+w, y0+h, c);
VGAXUtils::draw_line(x0, y0+h, x0+w, y0+h, c);
}
//porting of TVOut::draw_row method, writen by Myles Metzer
static inline void draw_row(uint8_t line, uint8_t x0, uint8_t x1, uint8_t c) {
if (x0 == x1) {
VGAX::putpixel(x0, line, c);
} else {
if (x0 > x1) {
uint8_t tmp=x0;
x0=x1;
x1=tmp;
}
while (x0 < x1) {
VGAX::putpixel(x0++, line, c);
}
}
}
//porting of TVOut::draw_column method, writen by Myles Metzer
static inline void draw_column(uint8_t row, uint8_t y0, uint8_t y1, uint8_t c) {
if (y0 == y1) {
VGAX::putpixel(row, y0, c);
} else {
if (y1 < y0) {
uint8_t tmp=y0;
y0=y1;
y1=tmp;
}
while (y0 < y1) {
VGAX::putpixel(row, y0++, c);
}
}
}
//porting of TVOut::draw_line method, writen by Myles Metzer
//Safe version with screen clipping
static inline void draw_line_safe(uint8_t x0, uint8_t y0,
uint8_t x1, uint8_t y1, uint8_t c) {
if (x0>VGAX_WIDTH || y0>VGAX_HEIGHT || x1>VGAX_WIDTH || y1>VGAX_HEIGHT)
return;
if (x0==x1)
VGAXUtils::draw_column_safe(x0, y0, y1, c);
else if (y0==y1)
VGAXUtils::draw_row_safe(y0, x0, x1, c);
else {
int e;
signed int dx, dy, j, temp;
signed char s1, s2, xchange;
signed int x, y;
x=x0;
y=y0;
//take absolute value
if (x1<x0) {
dx=x0-x1;
s1=-1;
} else if (x1==x0) {
dx=0;
s1=0;
} else {
dx=x1-x0;
s1=1;
}
if (y1<y0) {
dy=y0-y1;
s2=-1;
} else if (y1==y0) {
dy=0;
s2=0;
} else {
dy=y1-y0;
s2=1;
}
xchange=0;
if (dy>dx) {
temp=dx;
dx=dy;
dy=temp;
xchange=1;
}
e=((int)dy<<1)-dx;
for (j=0; j<=dx; j++) {
putpixel_safe(x, y, c);
if (e>=0) {
if (xchange==1)
x=x+s1;
else
y=y+s2;
e=e-((int)dx<<1);
}
if (xchange==1)
y=y+s2;
else
x=x+s1;
e=e+((int)dy<<1);
}
}
}
//porting of TVOut::draw_circle method, writen by Myles Metzer
//Safe version with screen clipping
static inline void draw_circle_safe(uint8_t x0, uint8_t y0,
uint8_t radius, uint8_t c, char fc) {
int f=1-radius;
int ddF_x=1;
int ddF_y=-2 * radius;
int x=0;
int y=radius;
uint8_t pyy=y, pyx=x;
//there is a fill color
if (fc!=-1)
VGAXUtils::draw_row_safe(y0, x0-radius, x0+radius, fc);
VGAX::putpixel(x0, y0+radius, c);
VGAX::putpixel(x0, y0-radius, c);
VGAX::putpixel(x0+radius, y0, c);
VGAX::putpixel(x0-radius, y0, c);
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
//there is a fill color
if (fc != -1) {
//prevent double draws on the same rows
if (pyy != y) {
VGAXUtils::draw_row_safe(y0+y, x0-x, x0+x, fc);
VGAXUtils::draw_row_safe(y0-y, x0-x, x0+x, fc);
}
if (pyx != x && x != y) {
VGAXUtils::draw_row_safe(y0+x, x0-y, x0+y, fc);
VGAXUtils::draw_row_safe(y0-x, x0-y, x0+y, fc);
}
pyy=y;
pyx=x;
}
putpixel_safe(x0+x, y0+y, c);
putpixel_safe(x0-x, y0+y, c);
putpixel_safe(x0+x, y0-y, c);
putpixel_safe(x0-x, y0-y, c);
putpixel_safe(x0+y, y0+x, c);
putpixel_safe(x0-y, y0+x, c);
putpixel_safe(x0+y, y0-x, c);
putpixel_safe(x0-y, y0-x, c);
}
}
//porting of TVOut::draw_rect method, writen by Myles Metzer
//Safe version with screen clipping
static inline void draw_rect_safe(uint8_t x0, uint8_t y0, uint8_t w, uint8_t h,
uint8_t c, char fc) {
if (fc != -1) {
for (unsigned char i=y0; i < y0+h; i++) {
VGAXUtils::draw_row_safe(i, x0, x0+w, fc);
}
}
VGAXUtils::draw_line_safe(x0, y0, x0+w, y0, c);
VGAXUtils::draw_line_safe(x0, y0, x0, y0+h, c);
VGAXUtils::draw_line_safe(x0+w, y0, x0+w, y0+h, c);
VGAXUtils::draw_line_safe(x0, y0+h, x0+w, y0+h, c);
}
//porting of TVOut::draw_row method, writen by Myles Metzer
//Safe version with screen clipping
static inline void draw_row_safe(uint8_t line, uint8_t x0, uint8_t x1, uint8_t c) {
if (x0 == x1) {
putpixel_safe(x0, line, c);
} else {
if (x0 > x1) {
uint8_t tmp=x0;
x0=x1;
x1=tmp;
}
while (x0 < x1) {
putpixel_safe(x0++, line, c);
}
}
}
//porting of TVOut::draw_column method, writen by Myles Metzer
//Safe version with screen clipping
static inline void draw_column_safe(uint8_t row, uint8_t y0, uint8_t y1, uint8_t c) {
if (y0 == y1) {
putpixel_safe(row, y0, c);
} else {
if (y1 < y0) {
uint8_t tmp=y0;
y0=y1;
y1=tmp;
}
while (y0 < y1) {
putpixel_safe(row, y0++, c);
}
}
}
static inline void putpixel_safe(char x, char y, uint8_t color) {
if (x>=VGAX_WIDTH || y>=VGAX_HEIGHT || x<0 || y<0)
return;
VGAX::putpixel(x, y, color);
}
};
#endif