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