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common code: Display wave form in color 

Show 0-line as blue and curve as green and channel number as white.
This commit is contained in:
Andreas Eversberg 2016-11-17 19:38:36 +01:00
parent 481181fa74
commit 0a83b19a99
1 changed files with 56 additions and 7 deletions
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63
src/common/display_wave.c
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@ -25,7 +25,7 @@
#define DISPLAY_INTERVAL 0.04
#define WIDTH 80
#define HEIGHT 10
#define HEIGHT 11
static int num_sender = 0;
static char screen[HEIGHT][WIDTH+1];
@ -60,16 +60,38 @@ void display_wave_on(int on)
printf("\0338"); fflush(stdout);
}
/*
* draw wave form:
*
* theoretical example: HEIGHT = 3 allows 5 steps
*
* Line 0: -_
* Line 1: -_
* Line 2: -
*
* HEIGHT is odd, so the center line's char is '-' (otherwise '_')
* (HEIGHT - 1) / 2 = 1, so the center line is drawn in line 1
*
* y is in range of 0..5, so these are 5 steps, where 2 to 2.999 is the
* center line. this is calculated by (HEIGHT * 2 - 1)
*/
void display_wave(sender_t *sender, int16_t *samples, int length)
{
dispwav_t *disp = &sender->dispwav;
int pos, max;
int16_t *buffer;
int i, j, y;
int i, j, k, y;
int color = 9; /* default color */
int center_line;
char center_char;
if (!wave_on)
return;
/* at what line we draw our zero-line and what character we use */
center_line = (HEIGHT - 1) >> 1;
center_char = (HEIGHT & 1) ? '-' : '_';
pos = disp->interval_pos;
max = disp->interval_max;
buffer = disp->buffer;
@ -84,8 +106,10 @@ void display_wave(sender_t *sender, int16_t *samples, int length)
if (pos == WIDTH) {
memset(&screen, ' ', sizeof(screen));
for (j = 0; j < WIDTH; j++) {
/* must divide by 65536, because we may never reach HEIGHT*2! */
y = (32767 - (int)buffer[j]) * HEIGHT * 2 / 65536;
/* 32767 - buffer[j] never reaches 65536, so
* the result is below HEIGHT * 2 - 1
*/
y = (32767 - (int)buffer[j]) * (HEIGHT * 2 - 1) / 65536;
screen[y >> 1][j] = (y & 1) ? '_' : '-';
}
sprintf(screen[0], "(chan %d", sender->kanal);
@ -94,10 +118,35 @@ void display_wave(sender_t *sender, int16_t *samples, int length)
for (j = 0; j < disp->offset; j++)
puts("");
for (j = 0; j < HEIGHT; j++) {
screen[j][WIDTH] = '\0';
puts(screen[j]);
for (k = 0; k < WIDTH; k++) {
if (j == center_line && screen[j][k] == ' ') {
/* blue 0-line */
if (color != 4) {
color = 4;
printf("\033[0;34m");
}
putchar(center_char);
} else if (screen[j][k] == '-' || screen[j][k] == '_') {
/* green scope curve */
if (color != 2) {
color = 2;
printf("\033[1;32m");
}
putchar(screen[j][k]);
} else if (screen[j][k] != ' ') {
/* white other characters */
if (color != 7) {
color = 7;
printf("\033[1;37m");
}
putchar(screen[j][k]);
} else
putchar(screen[j][k]);
}
printf("\n");
}
printf("\0338"); fflush(stdout);
/* reset color and position */
printf("\033[0;39m\0338"); fflush(stdout);
}
}