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snow.cpp
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snow.cpp
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#include "snow.h"
void Snow::setup() {
randomSeed(analogRead(0));
for (int i=0; i<ROWS; ++i) {
framebuffer[i] = 0x00;
}
}
void Snow::enter() {
drawFramebuffer();
}
void Snow::loop() {
Serial.println("loop");
// Check full rows
clearFullRows();
// Drop snowflakes
dropFlakes();
avalanche();
// Spawn new snowflake
spawnFlakes();
// Draw
drawFramebuffer();
}
void Snow::drawFramebuffer() {
for (int r=0; r<ROWS; ++r) {
byte row = framebuffer[r];
for (int c=0; c<COLS; ++c) {
lc.setLed(0,r,c,getFramebuffer(r,c));
}
}
}
void Snow::setFramebuffer(byte row, byte col, boolean state) {
byte val = B1000000 >> col;
if (state) {
framebuffer[row] = framebuffer[row] | val;
} else {
val=~val;
framebuffer[row] = framebuffer[row] & val;
}
}
boolean Snow::getFramebuffer(byte row, byte col) {
byte val = B1000000 >> col;
if (row < 0) return false;
return framebuffer[row] & val;
}
void Snow::clearFullRows() {
const byte fullRow = B1111111;
const byte clearRow = 0x00;
for (int r=MAX_ROW; r>0; --r) {
byte row = framebuffer[r];
if (row == fullRow && framebuffer[r-1] == fullRow) {
framebuffer[r] = clearRow;
} else {
return; // clear full rows only from the bottom
}
}
}
void Snow::dropFlakes() {
for (int r=MAX_ROW-1; r>=0; --r) {
byte row = framebuffer[r];
for (int c=0; c<COLS; ++c) {
if (getFramebuffer(r,c) && !getFramebuffer(r+1,c)) {
setFramebuffer(r,c,false);
setFramebuffer(r+1,c,true);
}
}
}
}
void Snow::avalanche() {
for (int r=0; r<ROWS-2; ++r) {
for (int c=0; c<COLS; ++c) {
if (getFramebuffer(r,c) && !getFramebuffer(r-1,c) && getFramebuffer(r+1,c)) {
boolean rightGap = c<MAX_COL && (!getFramebuffer(r+1,c+1) && !getFramebuffer(r+2,c+1));
boolean leftGap = 0<c && (!getFramebuffer(r+1,c-1) && !getFramebuffer(r+2,c-1));
if (leftGap && rightGap) {
if (random(0,2) == 0) {
rightGap = false;
} else {
leftGap = false;
}
}
if (leftGap || rightGap) {
setFramebuffer(r,c, false);
if (leftGap) {
setFramebuffer(r,c-1, true);
} else {
setFramebuffer(r,c+1, true);
}
}
}
}
}
}
void Snow::spawnFlakes() {
if(random(0,10) > 5) {
int c = random(0,COLS+1);
Serial.println("Spawning at " + String(c));
setFramebuffer(0,c,true);
}
}