### FastLED Panel Plus APA Example

Source: http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

An example sketch for driving APA102 LEDs with the SmartMatrix Shield using the FastLED library.

```c++
See the `FastLED_Panel_Plus_APA` sketch in the SmartMatrix Library for an example of driving the APA102 LEDs with the SmartMatrix Shield
```

--------------------------------

### Include Header and Initialize for 32x32 Panel

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Include the specific header for a 32x32 panel and declare the SmartMatrix object. This is the first step before initializing the library in `setup()`.

```cpp
#include <SmartMatrix_32x32.h>
SmartMatrix matrix;
```

--------------------------------

### Initialize SmartMatrix Library

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Call the `begin()` method within the `setup()` function to initialize the SmartMatrix library. This must be done after including the header and declaring the matrix object.

```cpp
void setup() {
  matrix.begin()
}
```

--------------------------------

### Include Header and Initialize for 16x32 Panel

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Include the specific header for a 16x32 panel and declare the SmartMatrix object. This is the first step before initializing the library in `setup()`.

```cpp
#include <SmartMatrix_16x32.h>
SmartMatrix matrix;
```

--------------------------------

### Get Screen Dimensions

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Retrieve the current width and height of the display buffer after potential rotation.

```cpp
uint16_t getScreenWidth(void);
uint16_t getScreenHeight(void);
```

--------------------------------

### Draw Border with Dynamic Dimensions

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Draw a white border around the screen using dynamically retrieved screen dimensions, ensuring compatibility with various rotations and display sizes.

```cpp
matrix.drawRectangle(0,0, matrix.getScreenHeight()-1, matrix.getScreenWidth()-1, {0xff, 0xff, 0xff});
```

--------------------------------

### Rotate Display and Redraw

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Clear the screen, swap buffers, rotate the display, and then redraw the content. This is necessary if rotation needs to change mid-program.

```cpp
matrix.fillScreen({0,0,0}); // clear screen by filling with black
matrix.swapBuffers();
matrix.setRotation(rotation90); // rotate to 90 degree position
// now draw your screen again
```

--------------------------------

### Configure and Display Scrolling Text

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Set scrolling mode, speed, font, and color before displaying text. Use a negative scroll count for infinite scrolling.

```cpp
matrix.setScrollMode(wrapForward);
    matrix.setScrollSpeed(10);
    matrix.setScrollFont(font3x5);
    matrix.setScrollColor({0xff,0xff,0xff});
    matrix.scrollText("Wrap message 4 times", 4);
```

```cpp
matrix.setScrollMode(bounceForward);
    matrix.setScrollSpeed(20);
    matrix.setFont(font5x7);
    matrix.setScrollColor({0x00,0xff,0x00});
    matrix.scrollText("Bounce Forever", -1);
```

--------------------------------

### Include SmartLED Shield for Teensy 4 (V5)

Source: http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

Uncomment this line in your sketch to specify that you are using the SmartLED Shield for Teensy 4 (V5). This is necessary for correct compilation and operation.

```cpp
#include <MatrixHardware_Teensy4_ShieldV5.h>        // SmartLED Shield for Teensy 4 (V5)
```

--------------------------------

### Set Color Correction Mode

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Enable or disable color correction. `ccNone` disables it, while `cc24` enables a specific correction mode.

```cpp
void setColorCorrection(colorCorrectionModes mode);

matrix.setColorCorrection(ccNone);
matrix.drawRectangle(0,0, matrix.getScreenHeight(), matrix.getScreenWidth()/3, fullRed);
matrix.drawRectangle(matrix.getScreenWidth()/3,0, matrix.getScreenHeight(), matrix.getScreenWidth()/3, halfRed);
matrix.drawRectangle(matrix.getScreenWidth()/3*2,0, matrix.getScreenHeight(), matrix.getScreenWidth()/3, quarterRed);
matrix.swapBuffers();
```

```cpp
matrix.setColorCorrection(cc24);
```

--------------------------------

### Swap Buffers to Display Drawing

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Call `swapBuffers()` to update the display with the contents of the drawing buffer. This method waits for the next refresh cycle to ensure a clean update.

```cpp
matrix.swapBuffers();
```

--------------------------------

### Include SmartLED Shield V4 Header

Source: http://docs.pixelmatix.com/SmartMatrix/shield-v4.html

Uncomment this line in your sketch to specify that you are using the SmartLED Shield for Teensy 3 (V4). This is essential for the SmartMatrix library to correctly configure the hardware.

```c++
#include <MatrixHardware_Teensy3_ShieldV4.h>        // SmartLED Shield for Teensy 3 (V4)
```

--------------------------------

### Set Display Brightness

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Adjust the display brightness without sacrificing color depth. Values range from 0 (off) to 255 (max).

```cpp
void setBrightness(uint8_t brightness);

matrix.setBrightness(255); // max brightness
matrix.setBrightness(25); // 10% brightness, for a dark room
```

--------------------------------

### Set Display Rotation

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Rotate the display by multiples of 90 degrees. This should be done early in the program before drawing.

```cpp
matrix.setRotation(rotation180);
```

--------------------------------

### Draw a Pixel with a Defined Color

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Use the `drawPixel()` function with a pre-defined `rgb24` color variable to set the color of a specific pixel at given coordinates.

```cpp
rgb24 myColor = {0xff, 0xff, 0xff}; // white
drawPixel(0,0,myColor);
```

--------------------------------

### Set Primary Colors Directly

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Assign values directly to the `red`, `green`, and `blue` members of an `rgb24` structure to set a specific color. This is an alternative to initializing with a struct literal.

```cpp
rgb24 myColor;
myColor.red = 0xff;
myColor.green = 0;
myColor.blue = 0;
```

--------------------------------

### Wait for Scrolling Text to Complete

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Display text and then wait for all scrolling instances to finish before proceeding. The `scrollText()` function returns the remaining scroll count.

```cpp
matrix.scrollText("Display this message twice", 2);

    // wait for scrolling to finish
    while(matrix.scrollText());

    matrix.scrollText("Then display this message once", 1);
```

--------------------------------

### Alternate Clock Pin for I2S Output

Source: http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

Use this option if you need I2S OUT1A and are willing to reroute the HUB75 clock pin. This requires cutting jumper JP4 and soldering to connect pin 8 to the HUB75 panel.

```cpp
const uint32_t kMatrixOptions = (SM_HUB75_OPTIONS_T4_CLK_PIN_ALT);
```

--------------------------------

### Define a Color Variable

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Declare an `rgb24` variable and assign values to its red, green, and blue members to define a specific color. This color can then be used in drawing functions.

```cpp
rgb24 myColor = {0xff, 0xff, 0xff}; // white
```

--------------------------------

### Stop Scrolling Text

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Initiate scrolling text and then stop it after a delay. Useful for temporary text displays.

```cpp
matrix.scrollText("Scroll this text forever", -1);

    delay(1000);
    matrix.stopScrollText();
```

--------------------------------

### APA102 SPI Bus Connection

Source: http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

Optional configuration for driving APA102 LEDs with the SPI bus. DAT connects to Teensy pin 11 and CLK to Teensy pin 13. This conflicts with the HUB75 pinout.

```c++
DAT to Teensy pin 11, and CLK to Teensy pin 13
```

--------------------------------

### APA102 LED Data and Clock Pins

Source: http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

Connects APA102 LEDs to the SmartLED Shield. DAT is connected to Teensy pin 5 and CLK to Teensy pin 4. VEXT/+5V supplies power from the APA102 strip to the shield.

```c++
DAT is connected to Teensy pin 5
CLK is connected to Teensy pin 4
VEXT/+5V is used to supply 5V from the APA102 strip to the SmartLED Shield
```

--------------------------------

### Draw a Pixel with an Inline Color

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Call `drawPixel()` and define the `rgb24` color directly within the function call using a struct literal. This is useful for one-off color assignments.

```cpp
drawPixel(0,0, {0xff, 0, 0});
```

--------------------------------

### Define rgb24 Color Structure

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

The `rgb24` structure defines a color with 8 bits for red, green, and blue components. This is used for all color-related drawing functions in the library.

```c
typedef struct rgb24 {
  uint8_t red;
  uint8_t green;
  uint8_t blue;
} rgb24;
```

--------------------------------

### Swap Buffers Without Copying Drawing Buffer

Source: http://docs.pixelmatix.com/SmartMatrix/library.html

Use `swapBuffers(false)` to disable the copying of the drawing buffer after swapping. This can improve performance if the entire buffer is redrawn each frame.

```cpp
matrix.fillScreen({0xff,0,0});
matrix.swapBuffers(false);
delay(1000);
matrix.fillScreen({0,0xff,0});
matrix.swapBuffers(false);
```

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