bool Pattern_spectrum_timeline::display()
{
int hue = g_hue.get();
// Copy previous rows.
int start_row = TIMELINE_DIRECTION > 0 ? 0 : ROW_COUNT - 1;
int end_row = flip_y(start_row);
for (int y = end_row; y != start_row; y -= TIMELINE_DIRECTION) {
for (int x = 0; x < COLUMN_COUNT; ++x) {
draw_pixel(x, y, get_pixel(x, y - TIMELINE_DIRECTION));
}
}
for (int x = 0; x < COLUMN_COUNT; ++x) {
int lightness = g_bins[x] * g_brightness.get() / MAX_BRIGHTNESS;
draw_pixel(x, start_row, make_hsv(hue, MAX_SATURATION, lightness));
}
return true;
}
/** Construct a color suitable for heat map display.
* @param[in] v Heat value (0 = cold, 1 = hot)
* @pre 0 <= @a v <= 1
*
* The resulting color is a fully-saturated bright color ranging from
* purple/blue for cold to red for hot. */
static Color make_heat(float v) {
assert(0 <= v && v <= 1);
return make_hsv(0.78f - 0.76f * v, 1, 1);
}
/** Construct a color suitable for heat map display.
* @param[in] v Heat value (0 = cold, 1 = hot)
* @pre 0 <= @a v <= 1
*
* The resulting color is a fully-saturated bright color ranging from
* purple/blue for cold to red for hot. */
gil::rgb8_pixel_t make_heat(float v) {
assert(0 <= v && v <= 1);
return make_hsv(0.78f - 0.76f * v, 1, 1);
}
