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ThermalBitmap.ino
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ThermalBitmap.ino
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#include "Adafruit_Thermal.h"
#include "SoftwareSerial.h"
#include <avr/pgmspace.h>
// Improved Perlin Noise from http://www.kasperkamperman.com/blog/perlin-noise-improved-noise-on-arduino/
// permutation array
PROGMEM const unsigned char p[] = {
171,160,137,91,90,15,
131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180,
};
// array below generated with this code line in the INoise code.
PROGMEM const uint16_t fadeArray[] = {
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 3, 4, 6, 7,
9, 10, 12, 14, 17, 19, 22, 25, 29, 32, 36, 40, 45, 49, 54, 60,
65, 71, 77, 84, 91, 98, 105, 113, 121, 130, 139, 148, 158, 167, 178, 188,
199, 211, 222, 234, 247, 259, 273, 286, 300, 314, 329, 344, 359, 374, 390, 407,
424, 441, 458, 476, 494, 512, 531, 550, 570, 589, 609, 630, 651, 672, 693, 715,
737, 759, 782, 805, 828, 851, 875, 899, 923, 948, 973, 998, 1023, 1049, 1074, 1100,
1127, 1153, 1180, 1207, 1234, 1261, 1289, 1316, 1344, 1372, 1400, 1429, 1457, 1486, 1515, 1543,
1572, 1602, 1631, 1660, 1690, 1719, 1749, 1778, 1808, 1838, 1868, 1898, 1928, 1958, 1988, 2018,
2048, 2077, 2107, 2137, 2167, 2197, 2227, 2257, 2287, 2317, 2346, 2376, 2405, 2435, 2464, 2493,
2523, 2552, 2580, 2609, 2638, 2666, 2695, 2723, 2751, 2779, 2806, 2834, 2861, 2888, 2915, 2942,
2968, 2995, 3021, 3046, 3072, 3097, 3122, 3147, 3172, 3196, 3220, 3244, 3267, 3290, 3313, 3336,
3358, 3380, 3402, 3423, 3444, 3465, 3486, 3506, 3525, 3545, 3564, 3583, 3601, 3619, 3637, 3654,
3672, 3688, 3705, 3721, 3736, 3751, 3766, 3781, 3795, 3809, 3822, 3836, 3848, 3861, 3873, 3884,
3896, 3907, 3917, 3928, 3937, 3947, 3956, 3965, 3974, 3982, 3990, 3997, 4004, 4011, 4018, 4024,
4030, 4035, 4041, 4046, 4050, 4055, 4059, 4063, 4066, 4070, 4073, 4076, 4078, 4081, 4083, 4085,
4086, 4088, 4089, 4091, 4092, 4092, 4093, 4094, 4094, 4095, 4095, 4095, 4095, 4095, 4095, 4095,
};
// default Adafruit Thermal Printer init code
#define TX_PIN 6 // Arduino transmit YELLOW WIRE labeled RX on printer
#define RX_PIN 5 // Arduino receive GREEN WIRE labeled TX on printer
SoftwareSerial mySerial(RX_PIN, TX_PIN); // Declare SoftwareSerial obj first
Adafruit_Thermal printer(&mySerial); // Pass addr to printer constructor
// Set up an array to hold a row of bitmap pixels
// This _should_ be bytes, not pixels (bits) but I couldn't find the right number that
// wouldn't cause the Arduino to crash part-way through a print.
// For now: 384 = the number of dots the thermal printer can print on a line
uint8_t pixels[384];
// vars for the print
int row = 0; // current row
int printRows = 1000; // total number of rows in the image -- 1000 = ~4.88inches (~124mm)
// vars for the noise algo
int x = 0;
float x0 = 0.0f;
float y0 = 0.0f;
float r = -3.0f;
float r2 = 0.0f;
boolean isrunning = true; // bool to figure out when to stop
void setup() {
delay(4000); // don't start printing immediately, giving time to plug in an upload new code.
// cheap indicator of when done
pinMode(13, OUTPUT);
digitalWrite(13,LOW);
randomSeed(analogRead(0));
mySerial.begin(19200); // Initialize SoftwareSerial
printer.begin(); // Init printer (same regardless of serial type)
// not sure this is needed here, but better safe than wonder
printer.wake();
printer.setDefault();
printer.feed(1);
row = 0;
x0 = random(0.0,5000.0); // sadly this doesn't do what I wanted, but leaving for reference
}
// This is the main drawing logic code
// -- check which row is printing
// -- if first: draw a border row
// -- if last: draw a border row
// -- if inbetween: draw side borders and row's content
void makeBitmapImage() {
memset(pixels, 0, sizeof(pixels)); // clear bitmap row
// handle borders
// kept first and last their own in case wanted to do something different
if (row == 0) { // first row (top border)
for (int i=0;i<384;i++) {
setBitPixel(pixels, i,1);
}
} else if (row == printRows) { // last row (bottom border)
for (int i=0;i<384;i++) {
setBitPixel(pixels, i,1);
}
} else { // everything inbetween
setBitPixel(pixels, 1, 3); // left border
setBitPixel(pixels, 382, 3); // right border
int inc = floor(384/20); // number of lines in the noise drawing
int pixw = 3; // width of the lines
// create noise for each line in drawing, based on the noise function
// r2 = multiplier of noise amount that raises then falls over the length of print
// to create flat lines at top and bottom and chaos in the middle
for (int y=0;y<=383;y+=inc) {
setBitPixel(pixels, y+(-r2/2.0f + inoise(x0,y*600.0f+y0,0.0f)/4096.0*r2), pixw);
}
}
// move in the noise for the next row. Mess with these numbers!
x0 += 170.0f;
y0 += 484.0f;
// these lines create the multiplier describes above
r+= (row < printRows/2) ? 0.029f : -0.029f;
r2 = max(r,0.0f); // clamp multiplier to a min of 0
// finally, print the row to the printer
printer.printBitmap(384, 1, pixels, false);
}
// This is the code to take a row of pixels, a pixel index, and a width and draw the correct points.
// This automatically sets the correct bit in each byte across the row
void setBitPixel(uint8_t *pxlBytes, int pxlIndex, short width) {
for (int i=1;i<=width;i++) {
int tmpIndex = pxlIndex - (floor(width/2)) + i; // center the width around desires pixel (use odd numbers)
int byteIndex = floor(tmpIndex/8); // e.g.: 33 / 8 = 4.125 -> floor 4
int bitIndex = floor(tmpIndex%8); // 3.g.: 33 % 8 = 1
// clamp to left/right bounds
if (byteIndex < 0) byteIndex = 0;
if (bitIndex < 0) bitIndex = 0;
if (byteIndex > 383) byteIndex = 383;
if (bitIndex > 7) bitIndex = 7;
// finally, set the appropriate bit in the byte
bitSet(pxlBytes[byteIndex], 7-bitIndex);
}
}
void loop() {
if (isrunning) {
if (row < printRows) {
makeBitmapImage();
row++;
} else {
isrunning = false;
// make sure to print the last row (border)
makeBitmapImage();
// wrap things up
finishPrint();
}
}
}
void finishPrint() {
// turn on LED for fun
digitalWrite(13,HIGH);
// feed paper in printer to just tear off
printer.feed(4);
}
// Improved Perlin Noise from http://www.kasperkamperman.com/blog/perlin-noise-improved-noise-on-arduino/
#define P(x) pgm_read_byte_near(p + ((x)&255))
long inoise(unsigned long x, unsigned long y, unsigned long z)
{
long X = x>>16 & 255, Y = y>>16 & 255, Z = z>>16 & 255, N = 1L<<16;
x &= N-1; y &= N-1; z &= N-1;
long u=fade(x),v=fade(y),w=fade(z), A=P(X)+Y, AA=P(A)+Z, AB=P(A+1)+Z, B=P(X+1)+Y, BA=P(B)+Z, BB=P(B+1)+Z;
return lerp(w, lerp(v, lerp(u, grad(P(AA), x , y , z ),
grad(P(BA), x-N , y , z )),
lerp(u, grad(P(AB), x , y-N , z ),
grad(P(BB), x-N , y-N , z ))),
lerp(v, lerp(u, grad(P(AA+1), x , y , z-N ),
grad(P(BA+1), x-N , y , z-N )),
lerp(u, grad(P(AB+1), x , y-N , z-N ),
grad(P(BB+1), x-N , y-N , z-N ))));
}
long lerp(long t, long a, long b) { return a + (t * (b - a) >> 12); }
long grad(long hash, long x, long y, long z)
{ long h = hash&15, u = h<8?x:y, v = h<4?y:h==12||h==14?x:z;
return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
}
#define F(x) pgm_read_word_near(fadeArray + (x))
long fade(long t)
{
long t0 = F(t >> 8), t1 = F(min(255, (t >> 8) + 1));
return t0 + ( (t & 255) * (t1 - t0) >> 8 );
}