Shapes

Draw a custom shape, such as circle, square, or a more complicated sprite. Do this by creating a two-dimensional array of bytes with a simple logic of 1 for light on and 0 for light off.

Challenges

Challenge 1

Invert your shape without modifying the array itself. Pixels which are now on should be off and vice-versa.

Challenge 2

Define your shape in base16 (Hexadecimal) instead of base2 (Binary). For example:

0  0  0  0  0  0  0  0
0  1  1  0  0  1  1  0
1  1  1  1  1  1  1  1
1  1  1  1  1  1  1  1
0  1  1  1  1  1  1  0
0  0  1  1  1  1  0  0
0  0  0  1  1  0  0  0
0  0  0  0  0  0  0  0   <-- base2

30 78 7C 7E 7E 7C 78 30  <-- Base16

Example

#include <MD_MAX72xx.h>

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define CS_PIN 10
#define SEGMENTS 1

MD_MAX72XX display = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, SEGMENTS);

const int frame[8][8] = {
    {0, 0, 0, 0, 0, 0, 0, 0},
    {0, 1, 1, 0, 0, 1, 1, 0},
    {1, 1, 1, 1, 1, 1, 1, 1},
    {1, 1, 1, 1, 1, 1, 1, 1},
    {0, 1, 1, 1, 1, 1, 1, 0},
    {0, 0, 1, 1, 1, 1, 0, 0},
    {0, 0, 0, 1, 1, 0, 0, 0},
    {0, 0, 0, 0, 0, 0, 0, 0}
};

void displayShape(const int frame[8][8]) {
    for (int row = 0; row < 8; row++) {
        for (int col = 0; col < 8; col++) {
            display.setPoint(col, row, frame[row][col]);
        }
    }
}

void setup() {
    display.begin();
    display.clear();
    displayShape(frame);
}

void loop() {
}