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plot.c
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plot.c
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#include <math.h>
#include <string.h>
#include "ch.h"
#include "hal.h"
#include "chprintf.h"
#include "nanovna.h"
#define __DRAW_Z__
#define SWAP(x,y) { int z=x; x = y; y = z; }
static void cell_draw_marker_info(int m, int n, int w, int h);
static void frequency_string(char *buf, size_t len, int32_t freq);
static void markmap_all_markers(void);
//#define GRID_COLOR 0x0863
//uint16_t grid_color = 0x1084;
/* indicate dirty cells */
static uint16_t markmap[2][8];
static uint16_t current_mappage = 0;
static int32_t fgrid = 50000000;
static int16_t grid_offset;
static int16_t grid_width;
int area_width = AREA_WIDTH_NORMAL;
int area_height = HEIGHT;
#define GRID_RECTANGULAR (1<<0)
#define GRID_SMITH (1<<1)
#define GRID_ADMIT (1<<2)
#define GRID_POLAR (1<<3)
#define CELLWIDTH 32
#define CELLHEIGHT 32
/*
* CELL_X0[27:31] cell position
* CELL_Y0[22:26]
* CELL_N[10:21] original order
* CELL_X[5:9] position in the cell
* CELL_Y[0:4]
*/
static uint32_t trace_index[TRACE_COUNT][POINT_COUNT];
#define INDEX(x, y, n) \
((((x)&0x03e0UL)<<22) | (((y)&0x03e0UL)<<17) | (((n)&0x0fffUL)<<10) \
| (((x)&0x1fUL)<<5) | ((y)&0x1fUL))
#define CELL_X(i) (int)((((i)>>5)&0x1f) | (((i)>>22)&0x03e0))
#define CELL_Y(i) (int)(((i)&0x1f) | (((i)>>17)&0x03e0))
#define CELL_N(i) (int)(((i)>>10)&0xfff)
#define CELL_X0(i) (int)(((i)>>22)&0x03e0)
#define CELL_Y0(i) (int)(((i)>>17)&0x03e0)
#define CELL_P(i, x, y) (((((x)&0x03e0UL)<<22) | (((y)&0x03e0UL)<<17)) == ((i)&0xffc00000UL))
void update_grid(void)
{
int32_t gdigit = 100000000;
int32_t fstart, fspan;
int32_t grid;
if (frequency1 > 0) {
fstart = frequency0;
fspan = frequency1 - frequency0;
} else {
fspan = -frequency1;
fstart = frequency0 - fspan/2;
}
while (gdigit > 100) {
grid = 5 * gdigit;
if (fspan / grid >= 4)
break;
grid = 2 * gdigit;
if (fspan / grid >= 4)
break;
grid = gdigit;
if (fspan / grid >= 4)
break;
gdigit /= 10;
}
fgrid = grid;
grid_offset = (WIDTH-1) * ((fstart % fgrid) / 100) / (fspan / 100);
grid_width = (WIDTH-1) * (fgrid / 100) / (fspan / 1000);
force_set_markmap();
redraw_request |= REDRAW_FREQUENCY;
}
static int circle_inout(int x, int y, int r)
{
int d = x*x + y*y - r*r;
if (d <= -r)
return 1;
if (d > r)
return -1;
return 0;
}
#define P_CENTER_X 146
#define P_CENTER_Y 116
#define P_RADIUS 116
static int polar_grid(int x, int y)
{
int c = config.grid_color;
int d;
// offset to center
x -= P_CENTER_X;
y -= P_CENTER_Y;
// outer circle
d = circle_inout(x, y, P_RADIUS);
if (d < 0) return 0;
if (d == 0) return c;
// vertical and horizontal axis
if (x == 0 || y == 0)
return c;
d = circle_inout(x, y, P_RADIUS / 5);
if (d == 0) return c;
if (d > 0) return 0;
d = circle_inout(x, y, P_RADIUS * 2 / 5);
if (d == 0) return c;
if (d > 0) return 0;
// cross sloping lines
if (x == y || x == -y)
return c;
d = circle_inout(x, y, P_RADIUS * 3 / 5);
if (d == 0) return c;
if (d > 0) return 0;
d = circle_inout(x, y, P_RADIUS * 4 / 5);
if (d == 0) return c;
return 0;
}
/*
* Constant Resistance circle: (u - r/(r+1))^2 + v^2 = 1/(r+1)^2
* Constant Reactance circle: (u - 1)^2 + (v-1/x)^2 = 1/x^2
*/
static int smith_grid(int x, int y)
{
int c = config.grid_color;
int d;
// offset to center
x -= P_CENTER_X;
y -= P_CENTER_Y;
// outer circle
d = circle_inout(x, y, P_RADIUS);
if (d < 0)
return 0;
if (d == 0)
return c;
// horizontal axis
if (y == 0)
return c;
// shift circle center to right origin
x -= P_RADIUS;
// Constant Reactance Circle: 2j : R/2 = 58
if (circle_inout(x, y+58, 58) == 0)
return c;
if (circle_inout(x, y-58, 58) == 0)
return c;
// Constant Resistance Circle: 3 : R/4 = 29
d = circle_inout(x+29, y, 29);
if (d > 0) return 0;
if (d == 0) return c;
// Constant Reactance Circle: 1j : R = 116
if (circle_inout(x, y+116, 116) == 0)
return c;
if (circle_inout(x, y-116, 116) == 0)
return c;
// Constant Resistance Circle: 1 : R/2 = 58
d = circle_inout(x+58, y, 58);
if (d > 0) return 0;
if (d == 0) return c;
// Constant Reactance Circle: 1/2j : R*2 = 232
if (circle_inout(x, y+232, 232) == 0)
return c;
if (circle_inout(x, y-232, 232) == 0)
return c;
// Constant Resistance Circle: 1/3 : R*3/4 = 87
if (circle_inout(x+87, y, 87) == 0)
return c;
return 0;
}
//static int smith_grid2(int x, int y, float scale)
//{
// int c = config.grid_color;
// int d;
//
// // offset to center
// x -= P_CENTER_X;
// y -= P_CENTER_Y;
//
// // outer circle
// d = circle_inout(x, y, P_RADIUS);
// if (d < 0)
// return 0;
// if (d == 0)
// return c;
//
// // shift circle center to right origin
// x -= P_RADIUS * scale;
//
// // Constant Reactance Circle: 2j : R/2 = 58
// if (circle_inout(x, y+58*scale, 58*scale) == 0)
// return c;
// if (circle_inout(x, y-58*scale, 58*scale) == 0)
// return c;
//#if 0
// // Constant Resistance Circle: 3 : R/4 = 29
// d = circle_inout(x+29*scale, y, 29*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
// d = circle_inout(x-29*scale, y, 29*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
//#endif
//
// // Constant Reactance Circle: 1j : R = 116
// if (circle_inout(x, y+116*scale, 116*scale) == 0)
// return c;
// if (circle_inout(x, y-116*scale, 116*scale) == 0)
// return c;
//
// // Constant Resistance Circle: 1 : R/2 = 58
// d = circle_inout(x+58*scale, y, 58*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
// d = circle_inout(x-58*scale, y, 58*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
//
// // Constant Reactance Circle: 1/2j : R*2 = 232
// if (circle_inout(x, y+232*scale, 232*scale) == 0)
// return c;
// if (circle_inout(x, y-232*scale, 232*scale) == 0)
// return c;
//
//#if 0
// // Constant Resistance Circle: 1/3 : R*3/4 = 87
// d = circle_inout(x+87*scale, y, 87*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
// d = circle_inout(x+87*scale, y, 87*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
//#endif
//
// // Constant Resistance Circle: 0 : R
// d = circle_inout(x+P_RADIUS*scale, y, P_RADIUS*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
// d = circle_inout(x-P_RADIUS*scale, y, P_RADIUS*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
//
// // Constant Resistance Circle: -1/3 : R*3/2 = 174
// d = circle_inout(x+174*scale, y, 174*scale);
// if (d > 0) return 0;
// if (d == 0) return c;
// d = circle_inout(x-174*scale, y, 174*scale);
// //if (d > 0) return 0;
// if (d == 0) return c;
// return 0;
//}
static const int cirs[][4] = {
{ 0, 58/2, 58/2, 0 }, // Constant Reactance Circle: 2j : R/2 = 58
{ 29/2, 0, 29/2, 1 }, // Constant Resistance Circle: 3 : R/4 = 29
{ 0, 116/2, 116/2, 0 }, // Constant Reactance Circle: 1j : R = 116
{ 58/2, 0, 58/2, 1 }, // Constant Resistance Circle: 1 : R/2 = 58
{ 0, 232/2, 232/2, 0 }, // Constant Reactance Circle: 1/2j : R*2 = 232
{ 87/2, 0, 87/2, 1 }, // Constant Resistance Circle: 1/3 : R*3/4 = 87
{ 0, 464/2, 464/2, 0 }, // Constant Reactance Circle: 1/4j : R*4 = 464
{ 116/2, 0, 116/2, 1 }, // Constant Resistance Circle: 0 : R
{ 174/2, 0, 174/2, 1 }, // Constant Resistance Circle: -1/3 : R*3/2 = 174
{ 0, 0, 0, 0 } // sentinel
};
static int smith_grid3(int x, int y)
{
int c = config.grid_color;
int d;
// offset to center
x -= P_CENTER_X;
y -= P_CENTER_Y;
// outer circle
d = circle_inout(x, y, P_RADIUS);
if (d < 0)
return 0;
if (d == 0)
return c;
// shift circle center to right origin
x -= P_RADIUS /2;
int i;
for (i = 0; cirs[i][2]; i++) {
d = circle_inout(x+cirs[i][0], y+cirs[i][1], cirs[i][2]);
if (d == 0)
return c;
if (d > 0 && cirs[i][3])
return 0;
d = circle_inout(x-cirs[i][0], y-cirs[i][1], cirs[i][2]);
if (d == 0)
return c;
if (d > 0 && cirs[i][3])
return 0;
}
return 0;
}
//static int rectangular_grid(int x, int y)
//{
// int c = config.grid_color;
// //#define FREQ(x) (((x) * (fspan / 1000) / (WIDTH-1)) * 1000 + fstart)
// //int32_t n = FREQ(x-1) / fgrid;
// //int32_t m = FREQ(x) / fgrid;
// //if ((m - n) > 0)
// //if (((x * 6) % (WIDTH-1)) < 6)
// //if (((x - grid_offset) % grid_width) == 0)
// if (x == 0 || x == WIDTH-1)
// return c;
// if ((y % GRIDY) == 0)
// return c;
// if ((((x + grid_offset) * 10) % grid_width) < 10)
// return c;
// return 0;
//}
static int rectangular_grid_x(int x)
{
int c = config.grid_color;
if (x < 0)
return 0;
if (x == 0 || x == WIDTH)
return c;
if ((((x + grid_offset) * 10) % grid_width) < 10)
return c;
return 0;
}
static int rectangular_grid_y(int y)
{
int c = config.grid_color;
if (y < 0)
return 0;
if ((y % GRIDY) == 0)
return c;
return 0;
}
//static int set_strut_grid(int x)
//{
// uint16_t *buf = spi_buffer;
// int y;
//
// for (y = 0; y < HEIGHT; y++) {
// int c = rectangular_grid(x, y);
// c |= smith_grid(x, y);
// *buf++ = c;
// }
// return y;
//}
//
//static void draw_on_strut(int v0, int d, int color)
//{
// int v;
// int v1 = v0 + d;
// if (v0 < 0) v0 = 0;
// if (v1 < 0) v1 = 0;
// if (v0 >= HEIGHT) v0 = HEIGHT-1;
// if (v1 >= HEIGHT) v1 = HEIGHT-1;
// if (v0 == v1) {
// v = v0; d = 2;
// } else if (v0 < v1) {
// v = v0; d = v1 - v0 + 1;
// } else {
// v = v1; d = v0 - v1 + 1;
// }
// while (d-- > 0)
// spi_buffer[v++] |= color;
//}
/*
* calculate log10(abs(gamma))
*/
static float logmag(float *v)
{
return log10f(v[0]*v[0] + v[1]*v[1]) * 10;
}
/*
* calculate phase[-2:2] of coefficient
*/
static float phase(float *v)
{
return 2 * atan2f(v[1], v[0]) / M_PI * 90;
}
/*
* calculate group_delay = -deltaAngle(gamma) / (deltaf * 360)
*/
static float group_delay(float gamma[POINT_COUNT][2], uint32_t* freq, int count, int index)
{
float *v, *w;
float deltaf;
if (index == count-1) {
deltaf = freq[index] - freq[index-1];
v = gamma[index-1];
w = gamma[index];
}
else {
deltaf = freq[index+1] - freq[index];
v = gamma[index];
w = gamma[index+1];
}
// w = w[0]/w[1]
// v = v[0]/v[1]
// atan(w)-atan(v) = atan((w-v)/(1+wv))
float r = w[0]*v[1] - w[1]*v[0];
float i = w[0]*v[0] + w[1]*v[1];
return atan2f(r, i) / (2 * M_PI * deltaf);
}
/*
* calculate abs(gamma)
*/
static float linear(float *v)
{
return - sqrtf(v[0]*v[0] + v[1]*v[1]);
}
/*
* calculate vswr; (1+gamma)/(1-gamma)
*/
static float swr(float *v)
{
float x = sqrtf(v[0]*v[0] + v[1]*v[1]);
if (x > 1)
return INFINITY;
return (1 + x)/(1 - x);
}
static float resitance(float *v) {
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
float zr = ((1+v[0])*(1-v[0]) - v[1]*v[1]) * d;
return zr;
}
static float reactance(float *v) {
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
float zi = 2*v[1] * d;
return zi;
}
#define RADIUS ((HEIGHT-1)/2)
static void cartesian_scale(float re, float im, int *xp, int *yp, float scale)
{
//float scale = 4e-3;
int x = (int)(re * RADIUS * scale);
int y = (int)(im * RADIUS * scale);
if (x < -RADIUS) x = -RADIUS;
if (y < -RADIUS) y = -RADIUS;
if (x > RADIUS) x = RADIUS;
if (y > RADIUS) y = RADIUS;
*xp = WIDTH/2 + x;
*yp = HEIGHT/2 - y;
}
static uint32_t trace_into_index(
int x, int t, int i,
float coeff[POINT_COUNT][2],
uint32_t freq[POINT_COUNT],
int point_count)
{
int y = 0;
float v = 0;
float refpos = 8 - get_trace_refpos(t);
float scale = 1 / get_trace_scale(t);
switch (trace[t].type) {
case TRC_LOGMAG:
v = refpos - logmag(coeff[i]) * scale;
break;
case TRC_PHASE:
v = refpos - phase(coeff[i]) * scale;
break;
case TRC_DELAY:
v = refpos - group_delay(coeff, freq, point_count, i) * scale;
break;
case TRC_LINEAR:
v = refpos + linear(coeff[i]) * scale;
break;
case TRC_SWR:
v = refpos+ (1 - swr(coeff[i])) * scale;
break;
case TRC_REAL:
v = refpos - coeff[i][0] * scale;
break;
case TRC_IMAG:
v = refpos - coeff[i][1] * scale;
break;
case TRC_R:
v = refpos - resitance(coeff[i]) * scale;
break;
case TRC_X:
v = refpos - reactance(coeff[i]) * scale;
break;
case TRC_SMITH:
//case TRC_ADMIT:
case TRC_POLAR:
cartesian_scale(coeff[i][0], coeff[i][1], &x, &y, scale);
return INDEX(x +CELLOFFSETX, y, i);
break;
}
if (v < 0) v = 0;
if (v > 8) v = 8;
y = (int)(v * GRIDY);
return INDEX(x +CELLOFFSETX, y, i);
}
static int string_value_with_prefix(char *buf, int len, float val, char unit)
{
char prefix;
int n;
if (val < 0) {
val = -val;
*buf++ = '-';
len--;
}
if (val < 1e-12) {
prefix = 'f';
val *= 1e15;
} else if (val < 1e-9) {
prefix = 'p';
val *= 1e12;
} else if (val < 1e-6) {
prefix = 'n';
val *= 1e9;
} else if (val < 1e-3) {
prefix = S_MICRO[0];
val *= 1e6;
} else if (val < 1) {
prefix = 'm';
val *= 1e3;
} else if (val < 1e3) {
prefix = 0;
} else if (val < 1e6) {
prefix = 'k';
val /= 1e3;
} else if (val < 1e9) {
prefix = 'M';
val /= 1e6;
} else {
prefix = 'G';
val /= 1e9;
}
if (val < 10) {
n = chsnprintf(buf, len, "%.2f", val);
} else if (val < 100) {
n = chsnprintf(buf, len, "%.1f", val);
} else {
n = chsnprintf(buf, len, "%d", (int)val);
}
if (prefix)
buf[n++] = prefix;
if (unit)
buf[n++] = unit;
buf[n] = '\0';
return n;
}
#define PI2 6.283184
static void gamma2imp(char *buf, int len, const float coeff[2], uint32_t frequency)
{
// z = (gamma+1)/(gamma-1) * z0
float z0 = 50;
float d = z0 / ((1-coeff[0])*(1-coeff[0])+coeff[1]*coeff[1]);
float zr = ((1+coeff[0])*(1-coeff[0]) - coeff[1]*coeff[1]) * d;
float zi = 2*coeff[1] * d;
int n;
n = string_value_with_prefix(buf, len, zr, S_OHM[0]);
buf[n++] = ' ';
if (zi < 0) {
float c = -1 / (PI2 * frequency * zi);
string_value_with_prefix(buf+n, len-n, c, 'F');
} else {
float l = zi / (PI2 * frequency);
string_value_with_prefix(buf+n, len-n, l, 'H');
}
}
static void gamma2resistance(char *buf, int len, const float coeff[2])
{
float z0 = 50;
float d = z0 / ((1-coeff[0])*(1-coeff[0])+coeff[1]*coeff[1]);
float zr = ((1+coeff[0])*(1-coeff[0]) - coeff[1]*coeff[1]) * d;
string_value_with_prefix(buf, len, zr, S_OHM[0]);
}
static void gamma2reactance(char *buf, int len, const float coeff[2])
{
float z0 = 50;
float d = z0 / ((1-coeff[0])*(1-coeff[0])+coeff[1]*coeff[1]);
float zi = 2*coeff[1] * d;
string_value_with_prefix(buf, len, zi, S_OHM[0]);
}
static void trace_get_value_string(
int t, char *buf, int len,
int i, float coeff[POINT_COUNT][2],
uint32_t freq[POINT_COUNT],
int point_count)
{
float v;
switch (trace[t].type) {
case TRC_LOGMAG:
v = logmag(coeff[i]);
if (v == -INFINITY)
chsnprintf(buf, len, "-INF dB");
else
chsnprintf(buf, len, "%.2fdB", v);
break;
case TRC_PHASE:
v = phase(coeff[i]);
chsnprintf(buf, len, "%.3f" S_DEGREE, v);
break;
case TRC_DELAY:
v = group_delay(coeff, freq, point_count, i);
string_value_with_prefix(buf, len, v, 's');
break;
case TRC_LINEAR:
v = linear(coeff[i]);
chsnprintf(buf, len, "%.3f", v);
break;
case TRC_SWR:
v = swr(coeff[i]);
chsnprintf(buf, len, "%.2f", v);
break;
case TRC_SMITH:
gamma2imp(buf, len, coeff[i], freq[i]);
break;
case TRC_REAL:
chsnprintf(buf, len, "%.3f", coeff[i][0]);
break;
case TRC_IMAG:
chsnprintf(buf, len, "%.3fj", coeff[i][1]);
break;
case TRC_R:
gamma2resistance(buf, len, coeff[i]);
break;
case TRC_X:
gamma2reactance(buf, len, coeff[i]);
break;
//case TRC_ADMIT:
case TRC_POLAR:
chsnprintf(buf, len, "%.3f %.3fj", coeff[i][0], coeff[i][1]);
break;
}
}
void trace_get_info(int t, char *buf, int len)
{
const char *type = get_trace_typename(t);
int n;
switch (trace[t].type) {
case TRC_LOGMAG:
chsnprintf(buf, len, "%s %ddB/", type, (int)get_trace_scale(t));
break;
case TRC_PHASE:
chsnprintf(buf, len, "%s %d" S_DEGREE "/", type, (int)get_trace_scale(t));
break;
case TRC_SMITH:
//case TRC_ADMIT:
case TRC_POLAR:
chsnprintf(buf, len, "%s %.1fFS", type, get_trace_scale(t));
break;
default:
n = chsnprintf(buf, len, "%s ", type);
string_value_with_prefix(buf+n, len-n, get_trace_scale(t), '/');
break;
}
}
static float time_of_index(int idx) {
return 1.0 / (float)(frequencies[1] - frequencies[0]) / (float)FFT_SIZE * idx;
}
static float distance_of_index(int idx) {
#define SPEED_OF_LIGHT 299792458
float distance = ((float)idx * (float)SPEED_OF_LIGHT) / ( (float)(frequencies[1] - frequencies[0]) * (float)FFT_SIZE * 2.0);
return distance * (velocity_factor / 100.0);
}
static inline void mark_map(int x, int y)
{
if (y >= 0 && y < 8 && x >= 0 && x < 16)
markmap[current_mappage][y] |= 1<<x;
}
static inline int is_mapmarked(int x, int y)
{
uint16_t bit = 1<<x;
return (markmap[0][y] & bit) || (markmap[1][y] & bit);
}
static inline void markmap_upperarea(void)
{
markmap[current_mappage][0] |= 0xffff;
}
static inline void swap_markmap(void)
{
current_mappage = 1 - current_mappage;
}
static inline void clear_markmap(void)
{
memset(markmap[current_mappage], 0, sizeof markmap[current_mappage]);
}
inline void force_set_markmap(void)
{
memset(markmap[current_mappage], 0xff, sizeof markmap[current_mappage]);
}
static void mark_cells_from_index(void)
{
int t;
/* mark cells between each neighber points */
for (t = 0; t < TRACE_COUNT; t++) {
if (!trace[t].enabled)
continue;
int x0 = CELL_X(trace_index[t][0]);
int y0 = CELL_Y(trace_index[t][0]);
int m0 = x0 >> 5;
int n0 = y0 >> 5;
int i;
mark_map(m0, n0);
for (i = 1; i < sweep_points; i++) {
int x1 = CELL_X(trace_index[t][i]);
int y1 = CELL_Y(trace_index[t][i]);
int m1 = x1 >> 5;
int n1 = y1 >> 5;
while (m0 != m1 || n0 != n1) {
if (m0 == m1) {
if (n0 < n1) n0++; else n0--;
} else if (n0 == n1) {
if (m0 < m1) m0++; else m0--;
} else {
int x = (m0 < m1) ? (m0 + 1)<<5 : m0<<5;
int y = (n0 < n1) ? (n0 + 1)<<5 : n0<<5;
int sgn = (n0 < n1) ? 1 : -1;
if (sgn*(y-y0)*(x1-x0) < sgn*(x-x0)*(y1-y0)) {
if (m0 < m1) m0++;
else m0--;
} else {
if (n0 < n1) n0++;
else n0--;
}
}
mark_map(m0, n0);
}
x0 = x1;
y0 = y1;
m0 = m1;
n0 = n1;
}
}
}
void plot_into_index(float measured[2][POINT_COUNT][2])
{
int i, t;
for (i = 0; i < sweep_points; i++) {
int x = i * (WIDTH-1) / (sweep_points-1);
for (t = 0; t < TRACE_COUNT; t++) {
if (!trace[t].enabled)
continue;
int n = trace[t].channel;
trace_index[t][i] = trace_into_index(
x, t, i,
measured[n], frequencies, sweep_points);
}
}
#if 0
for (t = 0; t < TRACE_COUNT; t++)
if (trace[t].enabled && trace[t].polar)
quicksort(trace_index[t], 0, sweep_points);
#endif
mark_cells_from_index();
markmap_all_markers();
}
//static const uint8_t INSIDE = 0x00;
static const uint8_t LEFT = 0x01;
static const uint8_t RIGHT = 0x02;
static const uint8_t BOTTOM = 0x04;
static const uint8_t TOP = 0x08;
static inline uint8_t _compute_outcode(int w, int h, int x, int y)
{
uint8_t code = 0;
if (x < 0) {
code |= LEFT;
} else
if (x > w) {
code |= RIGHT;
}
if (y < 0) {
code |= BOTTOM;
} else
if (y > h) {
code |= TOP;
}
return code;
}
static void cell_drawline(int w, int h, int x0, int y0, int x1, int y1, int c)
{
uint8_t outcode0 = _compute_outcode(w, h, x0, y0);
uint8_t outcode1 = _compute_outcode(w, h, x1, y1);
if (outcode0 & outcode1) {
// this line is out of requested area. early return
return;
}
if (x0 > x1) {
SWAP(x0, x1);
SWAP(y0, y1);
}
int dx = x1 - x0;
int dy = y1 - y0;
int sy = dy > 0 ? 1 : -1;
int e = 0;
dy *= sy;
if (dx >= dy) {
e = dy * 2 - dx;
while (x0 != x1) {
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
x0++;
e += dy * 2;
if (e >= 0) {
e -= dx * 2;
y0 += sy;
}
}
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
} else {
e = dx * 2 - dy;
while (y0 != y1) {
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
y0 += sy;
e += dx * 2;
if (e >= 0) {
e -= dy * 2;
x0++;
}
}
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w) spi_buffer[y0*w+x0] |= c;
}
}
//static int search_index_range(int x, int y, uint32_t index[POINT_COUNT], int *i0, int *i1)
//{
// int i, j;
// int head = 0;
// int tail = sweep_points;
// i = 0;
// x &= 0x03e0;
// y &= 0x03e0;
// while (head < tail) {
// i = (head + tail) / 2;
// if (x < CELL_X0(index[i]))
// tail = i+1;
// else if (x > CELL_X0(index[i]))
// head = i;
// else if (y < CELL_Y0(index[i]))
// tail = i+1;
// else if (y > CELL_Y0(index[i]))
// head = i;
// else
// break;
// }
//
// if (x != CELL_X0(index[i]) || y != CELL_Y0(index[i]))
// return FALSE;
//
// j = i;
// while (j > 0 && x == CELL_X0(index[j-1]) && y == CELL_Y0(index[j-1]))
// j--;
// *i0 = j;
// j = i;
// while (j < 100 && x == CELL_X0(index[j+1]) && y == CELL_Y0(index[j+1]))
// j++;
// *i1 = j;
// return TRUE;
//}
static int search_index_range_x(int x, uint32_t index[POINT_COUNT], int *i0, int *i1)
{
int i, j;
int head = 0;
int tail = sweep_points;
x &= 0x03e0;
i = 0;
while (head < tail) {
i = (head + tail) / 2;
if (x == CELL_X0(index[i]))
break;
else if (x < CELL_X0(index[i])) {
if (tail == i+1)
break;
tail = i+1;
} else {
if (head == i)
break;
head = i;
}
}
if (x != CELL_X0(index[i]))
return FALSE;
j = i;
while (j > 0 && x == CELL_X0(index[j-1]))
j--;
*i0 = j;
j = i;
while (j < 100 && x == CELL_X0(index[j+1]))
j++;
*i1 = j;
return TRUE;
}
static void draw_refpos(int w, int h, int x, int y, int c)
{
// draw triangle
int i, j;
if (y < -3 || y > 32 + 3)
return;
for (j = 0; j < 3; j++) {
int j0 = 6 - j*2;
for (i = 0; i < j0; i++) {
int x0 = x + i-5;
int y0 = y - j;
int y1 = y + j;
if (y0 >= 0 && y0 < h && x0 >= 0 && x0 < w)
spi_buffer[y0*w+x0] = c;
if (j != 0 && y1 >= 0 && y1 < h && x0 >= 0 && x0 < w)
spi_buffer[y1*w+x0] = c;
}
}
}