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plot.c
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plot.c
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/*
* Copyright (c) 2014-2015, TAKAHASHI Tomohiro (TTRFTECH) edy555@gmail.com
* All rights reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* The software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <math.h>
#include <string.h>
#include "ch.h"
#include "hal.h"
#include "chprintf.h"
#include "nanovna.h"
static void cell_draw_marker_info(int x0, int y0);
static void draw_battery_status(void);
static int16_t grid_offset;
static int16_t grid_width;
int16_t area_width = AREA_WIDTH_NORMAL;
int16_t area_height = AREA_HEIGHT_NORMAL;
// Cell render use spi buffer
typedef uint16_t pixel_t;
pixel_t *cell_buffer = (pixel_t *)spi_buffer;
// Cell size
// Depends from spi_buffer size, CELLWIDTH*CELLHEIGHT*sizeof(pixel) <= sizeof(spi_buffer)
#define CELLWIDTH (64)
#define CELLHEIGHT (32)
// Check buffer size
#if CELLWIDTH*CELLHEIGHT > SPI_BUFFER_SIZE
#error "Too small spi_buffer size SPI_BUFFER_SIZE < CELLWIDTH*CELLHEIGH"
#endif
// indicate dirty cells (not redraw if cell data not changed)
#define MAX_MARKMAP_X ((320+CELLWIDTH-1)/CELLWIDTH)
#define MAX_MARKMAP_Y ((240+CELLHEIGHT-1)/CELLHEIGHT)
// Define markmap mask size
#if MAX_MARKMAP_X <= 8
typedef uint8_t map_t;
#elif MAX_MARKMAP_X <= 16
typedef uint16_t map_t;
#elif MAX_MARKMAP_X <= 32
typedef uint32_t map_t;
#endif
map_t markmap[2][MAX_MARKMAP_Y];
uint8_t current_mappage = 0;
// Trace data cache, for faster redraw cells
// CELL_X[16:31] x position
// CELL_Y[ 0:15] y position
typedef uint32_t index_t;
static index_t trace_index[TRACES_MAX][POINTS_COUNT];
#define INDEX(x, y) ((((index_t)x)<<16)|(((index_t)y)))
#define CELL_X(i) (int)(((i)>>16))
#define CELL_Y(i) (int)(((i)&0xFFFF))
//#define float2int(v) ((int)(v))
static int
float2int(float v)
{
if (v < 0) return v - 0.5;
if (v > 0) return v + 0.5;
return 0;
}
void update_grid(void)
{
uint32_t gdigit = 100000000;
uint32_t fstart = get_sweep_frequency(ST_START);
uint32_t fspan = get_sweep_frequency(ST_SPAN);
uint32_t grid;
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;
}
grid_offset = (WIDTH) * ((fstart % grid) / 100) / (fspan / 100);
grid_width = (WIDTH) * (grid / 100) / (fspan / 1000);
force_set_markmap();
redraw_request |= REDRAW_FREQUENCY;
}
static inline 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;
}
static int
polar_grid(int x, int y)
{
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 1;
// vertical and horizontal axis
if (x == 0 || y == 0) return 1;
d = circle_inout(x, y, P_RADIUS / 5);
if (d == 0) return 1;
if (d > 0) return 0;
d = circle_inout(x, y, P_RADIUS * 2 / 5);
if (d == 0) return 1;
if (d > 0) return 0;
// cross sloping lines
if (x == y || x == -y) return 1;
d = circle_inout(x, y, P_RADIUS * 3 / 5);
if (d == 0) return 1;
if (d > 0) return 0;
d = circle_inout(x, y, P_RADIUS * 4 / 5);
if (d == 0) return 1;
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 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 1;
// horizontal axis
if (y == 0) return 1;
// shift circle center to right origin
x -= P_RADIUS;
// Constant Reactance Circle: 2j : R/2 = P_RADIUS/2
if (circle_inout(x, y + P_RADIUS / 2, P_RADIUS / 2) == 0) return 1;
if (circle_inout(x, y - P_RADIUS / 2, P_RADIUS / 2) == 0) return 1;
// Constant Resistance Circle: 3 : R/4 = P_RADIUS/4
d = circle_inout(x + P_RADIUS / 4, y, P_RADIUS / 4);
if (d > 0) return 0;
if (d == 0) return 1;
// Constant Reactance Circle: 1j : R = P_RADIUS
if (circle_inout(x, y + P_RADIUS, P_RADIUS) == 0) return 1;
if (circle_inout(x, y - P_RADIUS, P_RADIUS) == 0) return 1;
// Constant Resistance Circle: 1 : R/2
d = circle_inout(x + P_RADIUS / 2, y, P_RADIUS / 2);
if (d > 0) return 0;
if (d == 0) return 1;
// Constant Reactance Circle: 1/2j : R*2
if (circle_inout(x, y + P_RADIUS * 2, P_RADIUS * 2) == 0) return 1;
if (circle_inout(x, y - P_RADIUS * 2, P_RADIUS * 2) == 0) return 1;
// Constant Resistance Circle: 1/3 : R*3/4
if (circle_inout(x + P_RADIUS * 3 / 4, y, P_RADIUS * 3 / 4) == 0) return 1;
return 0;
}
#if 0
static int
smith_grid2(int x, int y, float scale)
{
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 1;
// 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 1;
if (circle_inout(x, y-58*scale, 58*scale) == 0)
return 1;
#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 1;
d = circle_inout(x-29*scale, y, 29*scale);
if (d > 0) return 0;
if (d == 0) return 1;
#endif
// Constant Reactance Circle: 1j : R = 116
if (circle_inout(x, y+116*scale, 116*scale) == 0)
return 1;
if (circle_inout(x, y-116*scale, 116*scale) == 0)
return 1;
// 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 1;
d = circle_inout(x-58*scale, y, 58*scale);
if (d > 0) return 0;
if (d == 0) return 1;
// Constant Reactance Circle: 1/2j : R*2 = 232
if (circle_inout(x, y+232*scale, 232*scale) == 0)
return 1;
if (circle_inout(x, y-232*scale, 232*scale) == 0)
return 1;
#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 1;
d = circle_inout(x+87*scale, y, 87*scale);
if (d > 0) return 0;
if (d == 0) return 1;
#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 1;
d = circle_inout(x-P_RADIUS*scale, y, P_RADIUS*scale);
if (d > 0) return 0;
if (d == 0) return 1;
// 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 1;
d = circle_inout(x-174*scale, y, 174*scale);
//if (d > 0) return 0;
if (d == 0) return 1;
return 0;
}
#endif
#if 0
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, 115/2, 115/2, 0 }, // Constant Reactance Circle: 1j : R = 115
{ 58/2, 0, 58/2, 1 }, // Constant Resistance Circle: 1 : R/2 = 58
{ 0, 230/2, 230/2, 0 }, // Constant Reactance Circle: 1/2j : R*2 = 230
{ 86/2, 0, 86/2, 1 }, // Constant Resistance Circle: 1/3 : R*3/4 = 86
{ 0, 460/2, 460/2, 0 }, // Constant Reactance Circle: 1/4j : R*4 = 460
{ 115/2, 0, 115/2, 1 }, // Constant Resistance Circle: 0 : R
{ 173/2, 0, 173/2, 1 }, // Constant Resistance Circle: -1/3 : R*3/2 = 173
{ 0, 0, 0, 0 } // sentinel
};
static int
smith_grid3(int x, int y)
{
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 1;
// 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 1;
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 1;
if (d > 0 && cirs[i][3])
return 0;
}
return 0;
}
#endif
#if 0
static int
rectangular_grid(int x, int y)
{
//#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 1;
if ((y % GRIDY) == 0)
return 1;
if ((((x + grid_offset) * 10) % grid_width) < 10)
return 1;
return 0;
}
#endif
static int
rectangular_grid_x(int x)
{
x -= CELLOFFSETX;
if (x < 0) return 0;
if (x == 0 || x == WIDTH)
return 1;
if ((((x + grid_offset) * 10) % grid_width) < 10)
return 1;
return 0;
}
static int
rectangular_grid_y(int y)
{
if (y < 0)
return 0;
if ((y % GRIDY) == 0)
return 1;
return 0;
}
#if 0
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;
}
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;
}
#endif
/*
* calculate log10(abs(gamma))
*/
static float
logmag(const float *v)
{
return log10f(v[0]*v[0] + v[1]*v[1]) * 10;
}
/*
* calculate phase[-2:2] of coefficient
*/
static float
phase(const float *v)
{
return 2 * atan2f(v[1], v[0]) / VNA_PI * 90;
}
/*
* calculate groupdelay
*/
static float
groupdelay(const float *v, const float *w, float deltaf)
{
#if 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 * VNA_PI * deltaf);
#else
return (atan2f(w[0], w[1]) - atan2f(v[0], v[1])) / (2 * VNA_PI * deltaf);
#endif
}
/*
* calculate abs(gamma)
*/
static float
linear(const float *v)
{
return - sqrtf(v[0]*v[0] + v[1]*v[1]);
}
/*
* calculate vswr; (1+gamma)/(1-gamma)
*/
static float
swr(const 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(const 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(const 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;
}
static float
qualityfactor(const float *v)
{
float i = 2*v[1];
float r = (1+v[0])*(1-v[0]) - v[1]*v[1];
return fabs(i / r);
}
static void
cartesian_scale(float re, float im, int *xp, int *yp, float scale)
{
//float scale = 4e-3;
int x = float2int(re * P_RADIUS * scale);
int y = float2int(im * P_RADIUS * scale);
if (x < -P_RADIUS) x = -P_RADIUS;
else if (x > P_RADIUS) x = P_RADIUS;
if (y < -P_RADIUS) y = -P_RADIUS;
else if (y > P_RADIUS) y = P_RADIUS;
*xp = P_CENTER_X + x;
*yp = P_CENTER_Y - y;
}
float
groupdelay_from_array(int i, float array[POINTS_COUNT][2])
{
int bottom = (i == 0) ? 0 : i - 1;
int top = (i == sweep_points-1) ? sweep_points-1 : i + 1;
float deltaf = frequencies[top] - frequencies[bottom];
return groupdelay(array[bottom], array[top], deltaf);
}
static float
gamma2resistance(const float v[2])
{
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
return ((1+v[0])*(1-v[0]) - v[1]*v[1]) * d;
}
static float
gamma2reactance(const float v[2])
{
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
return 2*v[1] * d;
}
static index_t
trace_into_index(int t, int i, float array[POINTS_COUNT][2])
{
int y, x;
float *coeff = array[i];
float refpos = NGRIDY - get_trace_refpos(t);
float v = refpos;
float scale = 1 / get_trace_scale(t);
switch (trace[t].type) {
case TRC_LOGMAG:
v-= logmag(coeff) * scale;
break;
case TRC_PHASE:
v-= phase(coeff) * scale;
break;
case TRC_DELAY:
v-= groupdelay_from_array(i, array) * scale;
break;
case TRC_LINEAR:
v+= linear(coeff) * scale;
break;
case TRC_SWR:
v+= (1 - swr(coeff)) * scale;
break;
case TRC_REAL:
v-= coeff[0] * scale;
break;
case TRC_IMAG:
v-= coeff[1] * scale;
break;
case TRC_R:
v-= resitance(coeff) * scale;
break;
case TRC_X:
v-= reactance(coeff) * scale;
break;
case TRC_Q:
v-= qualityfactor(coeff) * scale;
break;
case TRC_SMITH:
//case TRC_ADMIT:
case TRC_POLAR:
cartesian_scale(coeff[0], coeff[1], &x, &y, scale);
goto set_index;
}
if (v < 0) v = 0;
if (v > NGRIDY) v = NGRIDY;
x = (i * (WIDTH) + (sweep_points-1)/2) / (sweep_points-1) + CELLOFFSETX;
y = float2int(v * GRIDY);
set_index:
return INDEX(x, y);
}
static void
format_smith_value(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;
char prefix;
float value;
switch (marker_smith_format) {
case MS_LIN:
plot_printf(buf, len, "%.2f %.1f" S_DEGREE, linear(coeff), phase(coeff));
break;
case MS_LOG: {
float v = logmag(coeff);
if (v == -INFINITY)
plot_printf(buf, len, "-"S_INFINITY" dB");
else
plot_printf(buf, len, "%.1fdB %.1f" S_DEGREE, v, phase(coeff));
}
break;
case MS_REIM:
plot_printf(buf, len, "%F%+Fj", coeff[0], coeff[1]);
break;
case MS_RX:
plot_printf(buf, len, "%F%+Fj"S_OHM, zr, zi);
break;
case MS_RLC:
if (zi < 0) {// Capacity
prefix = 'F';
value = -1 / (2 * VNA_PI * frequency * zi);
} else {
prefix = 'H';
value = zi / (2 * VNA_PI * frequency);
}
plot_printf(buf, len, "%F"S_OHM" %F%c", zr, value, prefix);
break;
}
}
static void
trace_get_value_string(int t, char *buf, int len, float array[POINTS_COUNT][2], int i)
{
float *coeff = array[i];
float v;
char *format;
switch (trace[t].type) {
case TRC_LOGMAG:
format = "%.2fdB";
v = logmag(coeff);
break;
case TRC_PHASE:
format = "%.1f"S_DEGREE;
v = phase(coeff);
break;
case TRC_DELAY:
format = "%.2Fs";
v = groupdelay_from_array(i, array);
break;
case TRC_LINEAR:
format = "%.4f";
v = linear(coeff);
break;
case TRC_SWR:
format = "%.4f";
v = swr(coeff);
break;
case TRC_REAL:
format = "%.4f";
v = coeff[0];
break;
case TRC_IMAG:
format = "%.4fj";
v = coeff[1];
break;
case TRC_R:
format = "%.2F"S_OHM;
v = gamma2resistance(coeff);
break;
case TRC_X:
format = "%.2F"S_OHM;
v = gamma2reactance(coeff);
break;
case TRC_Q:
format = "%.1f";
v = qualityfactor(coeff);
break;
case TRC_SMITH:
format_smith_value(buf, len, coeff, frequencies[i]);
return;
//case TRC_ADMIT:
case TRC_POLAR:
plot_printf(buf, len, "%.2f%+.2fj", coeff[0], coeff[1]);
default:
return;
}
plot_printf(buf, len, format, v);
}
static void
trace_get_value_string_delta(int t, char *buf, int len, float array[POINTS_COUNT][2], int index, int index_ref)
{
float *coeff = array[index];
float *coeff_ref = array[index_ref];
float v;
char *format;
switch (trace[t].type) {
case TRC_LOGMAG:
format = S_DELTA"%.2fdB";
v = logmag(coeff) - logmag(coeff_ref);
break;
case TRC_PHASE:
format = S_DELTA"%.2f"S_DEGREE;
v = phase(coeff) - phase(coeff_ref);
break;
case TRC_DELAY:
format = "%.2Fs";
v = groupdelay_from_array(index, array) - groupdelay_from_array(index_ref, array);
break;
case TRC_LINEAR:
format = S_DELTA"%.3f";
v = linear(coeff) - linear(coeff_ref);
break;
case TRC_SWR:
format = S_DELTA"%.3f";
v = swr(coeff);
if (v != INFINITY) v -= swr(coeff_ref);
break;
case TRC_SMITH:
format_smith_value(buf, len, coeff, frequencies[index]);
return;
case TRC_REAL:
format = S_DELTA"%.3f";
v = coeff[0] - coeff_ref[0];
break;
case TRC_IMAG:
format = S_DELTA"%.3fj";
v = coeff[1] - coeff_ref[1];
break;
case TRC_R:
format = "%.2F"S_OHM;
v = gamma2resistance(coeff);
break;
case TRC_X:
format = "%.2F"S_OHM;
v = gamma2reactance(coeff);
break;
case TRC_Q:
format = "%.1f";
v = qualityfactor(coeff);
break;
//case TRC_ADMIT:
case TRC_POLAR:
plot_printf(buf, len, "%.2f%+.2fj", coeff[0], coeff[1]);
return;
default:
return;
}
plot_printf(buf, len, format, v);
}
static int
trace_get_info(int t, char *buf, int len)
{
const char *name = get_trace_typename(t);
float scale = get_trace_scale(t);
switch (trace[t].type) {
case TRC_LOGMAG:
return plot_printf(buf, len, "%s %ddB/", name, (int)scale);
case TRC_PHASE:
return plot_printf(buf, len, "%s %d" S_DEGREE "/", name, (int)scale);
case TRC_SMITH:
//case TRC_ADMIT:
case TRC_POLAR:
if (scale != 1.0)
return plot_printf(buf, len, "%s %.1fFS", name, scale);
else
return plot_printf(buf, len, "%s ", name);
default:
return plot_printf(buf, len, "%s %F/", name, scale);
}
return 0;
}
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)
{
float distance = ((float)idx * (float)SPEED_OF_LIGHT) /
((float)(frequencies[1] - frequencies[0]) * (float)FFT_SIZE * 2.0);
return distance * velocity_factor;
}
static inline void
mark_map(int x, int y)
{
if (y >= 0 && y < MAX_MARKMAP_Y && x >= 0 && x < MAX_MARKMAP_X)
markmap[current_mappage][y] |= 1 << x;
}
static inline void
swap_markmap(void)
{
current_mappage^= 1;
}
static void
clear_markmap(void)
{
memset(markmap[current_mappage], 0, sizeof markmap[current_mappage]);
}
void
force_set_markmap(void)
{
memset(markmap[current_mappage], 0xff, sizeof markmap[current_mappage]);
}
void
invalidate_rect(int x0, int y0, int x1, int y1)
{
x0 /= CELLWIDTH;
x1 /= CELLWIDTH;
y0 /= CELLHEIGHT;
y1 /= CELLHEIGHT;
int x, y;
for (y = y0; y <= y1; y++)
for (x = x0; x <= x1; x++)
mark_map(x, y);
}
#define SWAP(x,y) {int t=x;x=y;y=t;}
static void
mark_cells_from_index(void)
{
int t, i, j;
/* mark cells between each neighber points */
map_t *map = &markmap[current_mappage][0];
for (t = 0; t < TRACES_MAX; t++) {
if (!trace[t].enabled)
continue;
index_t *index = &trace_index[t][0];
int m0 = CELL_X(index[0]) / CELLWIDTH;
int n0 = CELL_Y(index[0]) / CELLHEIGHT;
map[n0] |= 1 << m0;
for (i = 1; i < sweep_points; i++) {
int m1 = CELL_X(index[i]) / CELLWIDTH;
int n1 = CELL_Y(index[i]) / CELLHEIGHT;
if (m0 == m1 && n0 == n1)
continue;
int x0 = m0; int x1 = m1; if (x0>x1) SWAP(x0, x1); m0 = m1;
int y0 = n0; int y1 = n1; if (y0>y1) SWAP(y0, y1); n0 = n1;
for (; y0 <= y1; y0++)
for (j = x0; j <= x1; j++)
map[y0] |= 1 << j;
}
}
}
static inline void
markmap_upperarea(void)
{
// Hardcoded, Text info from upper area
invalidate_rect(0, 0, AREA_WIDTH_NORMAL, 31);
}
//
// in most cases _compute_outcode clip calculation not give render line speedup
//
static inline void
cell_drawline(int x0, int y0, int x1, int y1, int c)
{
if (x0 < 0 && x1 < 0) return;
if (y0 < 0 && y1 < 0) return;
if (x0 >= CELLWIDTH && x1 >= CELLWIDTH) return;
if (y0 >= CELLHEIGHT && y1 >= CELLHEIGHT) return;
// modifed Bresenham's line algorithm, see https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
if (x1 < x0) { SWAP(x0, x1); SWAP(y0, y1); }
int dx = x1 - x0;
int dy = y1 - y0, sy = 1; if (dy < 0) { dy = -dy; sy = -1; }
int err = (dx > dy ? dx : -dy) / 2;
while (1) {
if (y0 >= 0 && y0 < CELLHEIGHT && x0 >= 0 && x0 < CELLWIDTH)
cell_buffer[y0 * CELLWIDTH + x0] |= c;
if (x0 == x1 && y0 == y1)
return;
int e2 = err;
if (e2 > -dx) { err -= dy; x0++; }
if (e2 < dy) { err += dx; y0+=sy;}
}
}
// Give a little speedup then draw rectangular plot (50 systick on all calls, all render req 700 systick)
// Write more difficult algoritm for seach indexes not give speedup
static int
search_index_range_x(int x1, int x2, index_t index[POINTS_COUNT], int *i0, int *i1)
{
int i, j;
int head = 0;
int tail = sweep_points;
int idx_x;
// Search index point in cell
while (1) {
i = (head + tail) / 2;
idx_x = CELL_X(index[i]);
if (idx_x >= x2) { // index after cell
if (tail == i)
return false;
tail = i;
}
else if (idx_x < x1) { // index before cell
if (head == i)
return false;
head = i;
}
else // index in cell (x =< idx_x < cell_end)
break;
}
j = i;
// Search index left from point
do {
j--;
} while (j > 0 && x1 <= CELL_X(index[j]));
*i0 = j;
// Search index right from point
do {
i++;
} while (i < sweep_points-1 && CELL_X(index[i]) < x2);
*i1 = i;
return TRUE;
}
#define REFERENCE_WIDTH 6
#define REFERENCE_HEIGHT 5
#define REFERENCE_X_OFFSET 5
#define REFERENCE_Y_OFFSET 2
// Reference bitmap
static const uint8_t reference_bitmap[]={
0b11000000,
0b11110000,
0b11111100,
0b11110000,
0b11000000,
};
static void
draw_refpos(int x, int y, int c)
{
int y0 = y, j;
for (j = 0; j < REFERENCE_HEIGHT; j++, y0++) {
if (y0 < 0 || y0 >= CELLHEIGHT) continue;
int x0 = x;
uint8_t bits = reference_bitmap[j];
while (bits) {
if (x0 >= 0 && x0 < CELLWIDTH)
cell_buffer[y0 * CELLWIDTH + x0] = (bits & 0x80) ? c : DEFAULT_BG_COLOR;
x0++;
bits <<= 1;
}
}
}
#define MARKER_WIDTH 7
#define MARKER_HEIGHT 10
#define X_MARKER_OFFSET 3
#define Y_MARKER_OFFSET 10
static const uint8_t marker_bitmap[]={
// Marker 1
0b11111110,
0b11101110,
0b11001110,
0b11101110,
0b11101110,
0b11101110,
0b11000110,
0b01111100,
0b00111000,
0b00010000,
// Marker 2
0b11111110,
0b11000110,
0b10111010,
0b11111010,
0b11000110,
0b10111110,
0b10000010,
0b01111100,
0b00111000,
0b00010000,
// Marker 3
0b11111110,
0b11000110,