// Copyright 2024-2025 Google LLC // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. LED_MATRIX_EFFECT(FLOW) #ifdef LED_MATRIX_CUSTOM_EFFECT_IMPLS // "Flow" animated effect. Draws moving wave patterns mimicking the appearance // of flowing liquid. For interesting variety of patterns, space coordinates are // slowly rotated and a function of several sine waves is evaluated. static bool FLOW(effect_params_t* params) { LED_MATRIX_USE_LIMITS(led_min, led_max); static uint16_t wrap_correction = 0; static uint8_t last_high_byte = 0; const uint8_t time_scale = 1 + led_matrix_eeconfig.speed / 8; const uint8_t high_byte = (uint8_t)(g_led_timer >> 16); if (last_high_byte != high_byte) { last_high_byte = high_byte; wrap_correction += ((uint16_t)time_scale) << 8; } const uint16_t time = scale16by8(g_led_timer, time_scale) + wrap_correction; // Compute rotation coefficients with 7 fractional bits. const int8_t rot_c = cos8(time / 4) - 128; const int8_t rot_s = sin8(time / 4) - 128; const uint8_t omega = 32 + sin8(time) / 4; for (uint8_t i = led_min; i < led_max; ++i) { LED_MATRIX_TEST_LED_FLAGS(); const uint8_t x = g_led_config.point[i].x; const uint8_t y = g_led_config.point[i].y; // Rotate (x, y) by the 2x2 rotation matrix described by rot_c, rot_s. const uint8_t x1 = (uint8_t)((((int16_t)rot_c) * ((int16_t)x)) / 128) - (uint8_t)((((int16_t)rot_s) * ((int16_t)y)) / 128); const uint8_t y1 = (uint8_t)((((int16_t)rot_s) * ((int16_t)x)) / 128) + (uint8_t)((((int16_t)rot_c) * ((int16_t)y)) / 128); uint8_t value = scale8(sin8(x1 - 2 * time), omega) + y1 + time / 4; value = (value <= 127) ? value : (255 - value); led_matrix_set_value(i, scale8(led_matrix_eeconfig.val, value)); } return led_matrix_check_finished_leds(led_max); } #endif // LED_MATRIX_CUSTOM_EFFECT_IMPLS