Scrolling Text and Fixed Text using double buffer #791

ARPROJECT26 · 2025-05-07T07:27:51Z

I have the problem for Scrolling and Fixed Text using double buffer.
I don't want scroll text to overwrite fixed text when scroll text overlap with fixedtext.

any suggestion?

Thanks

`
#include <Arduino.h>
#include <ESP32-HUB75-VirtualMatrixPanel_T.hpp>
#include <Fonts/FreeSerifBold9pt7b.h>

/**

Configuration of the LED matrix panels number and individual pixel resolution.
**/
#define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 32 // Number of pixels tall of each INDIVIDUAL panel module.

#define VDISP_NUM_ROWS 2 // Number of rows of individual LED panels
#define VDISP_NUM_COLS 2 // Number of individual LED panels per row

#define PANEL_CHAIN_LEN (VDISP_NUM_ROWS * VDISP_NUM_COLS) // Don't change

/**

Configuration of the approach used to chain all the individual panels together.
Refer to the documentation or check the enum 'PANEL_CHAIN_TYPE' in VirtualMatrixPanel_T.hpp for options.
**/
#define PANEL_CHAIN_TYPE CHAIN_TOP_RIGHT_DOWN

/**

Optional config for the per-panel pixel mapping, for non-standard panels.
i.e. 1/4 scan panels, or outdoor panels. They're a pain in the a-- and all

 have their own weird pixel mapping that is not linear.

This is used for Examples 2 and 3.

**/
#define PANEL_SCAN_TYPE FOUR_SCAN_32PX_HIGH

/**

Mandatory declaration of the dma_display. DO NOT CHANGE
*/
MatrixPanel_I2S_DMA dma_display = nullptr;

// ------------------------------------------------------------------------------------------------------------

// --- Example 1: STANDARD 1/2 Scan ---

// Declare a pointer to the specific instantiation:
VirtualMatrixPanel_T<PANEL_CHAIN_TYPE>* virtualDisp = nullptr;

int16_t xOne, yOne;
uint16_t w, h;

int16_t fxOne, fyOne;
uint16_t fw, fh;

unsigned long isAnimationDue;
int delayBetweeenAnimations = 25; // Smaller == faster

// int textXPosition = PANEL_RES_X * PANEL_CHAIN_LEN; // Will start off screen
int textXPosition = 64 * 2; // Will start off screen

// int textYPosition = PANEL_RES_Y / 2 - 8; // center of screen - 8 (half of the text height)
int textYPosition = 8;

uint16_t myBLACK = dma_display->color565(0, 0, 0);
uint16_t myWHITE = dma_display->color565(255, 255, 255);
uint16_t myRED = dma_display->color565(255, 0, 0);
uint16_t myGREEN = dma_display->color565(0, 255, 0);
uint16_t myBLUE = dma_display->color565(0, 0, 255);

String scrollText = "Scroll Text";
String fixedText = "Fix";

void setup() {
Serial.begin(115200);
delay(2000);

HUB75_I2S_CFG mxconfig(
PANEL_RES_X,
PANEL_RES_Y,
PANEL_CHAIN_LEN
//, _pins
);

mxconfig.double_buff = true;
mxconfig.i2sspeed = HUB75_I2S_CFG::HZ_10M;
mxconfig.clkphase = false;
//mxconfig.driver = HUB75_I2S_CFG::FM6126A;

dma_display = new MatrixPanel_I2S_DMA(mxconfig);
dma_display->begin();
dma_display->setBrightness8(128); //0-255
dma_display->clearScreen();

virtualDisp = new VirtualMatrixPanel_T<PANEL_CHAIN_TYPE>(VDISP_NUM_ROWS, VDISP_NUM_COLS, PANEL_RES_X, PANEL_RES_Y);

virtualDisp->setDisplay(*dma_display);
virtualDisp->clearScreen();

virtualDisp->fillScreen(myBLACK);

virtualDisp->setTextSize(1); // size 2 == 16 pixels high
virtualDisp->setTextWrap(false); // N.B!! Don't wrap at end of line
virtualDisp->setTextColor(myRED);

String scrollText1 = "ABC";
Serial.println(scrollText1);
// virtualDisp->setFont(&FreeSerifBold9pt7b);

// scrollText1 = scrollText1.substring(0, scrollText1.length() - 1);
// Serial.println(scrollText1);
// scrollText1 = scrollText1.substring(0, scrollText1.length() - 1);
// Serial.println(scrollText1);
}

void loop() {

dma_display->flipDMABuffer();
delay(1000 / dma_display->calculated_refresh_rate);
dma_display->clearScreen();
delay(25);
virtualDisp->setCursor(0, textYPosition);
virtualDisp->print(fixedText);

unsigned long now = millis();
if (now > isAnimationDue) {
isAnimationDue = now + delayBetweeenAnimations;
textXPosition -= 1;

// Checking is the very right of the text off screen to the left
virtualDisp->getTextBounds(scrollText, textXPosition, textYPosition, &xOne, &yOne, &w, &h);
if (textXPosition + w <= 0) {
  textXPosition = 64 * 2;
}
virtualDisp->setCursor(textXPosition, textYPosition);
virtualDisp->print(scrollText);

}

// Serial.println("textXPosition + w");
// Serial.println(textXPosition + w);

// Serial.println("textXPosition");
// Serial.println(textXPosition);
// Serial.println("textYPosition");
// Serial.println(textYPosition);
}`

WhatsApp.Video.2025-05-07.at.14.27.07.mp4

The text was updated successfully, but these errors were encountered:

board707 · 2025-05-07T08:21:15Z

I don't want scroll text to overwrite fixed text when scroll text overlap with fixedtext.

You could first scroll moving text, and then renew a fixed text.

ARPROJECT26 · 2025-05-07T14:18:52Z

Hi @board707 ,

Thanks for the response.
I try to move fixedtext after scroll text still issue.

`
#include <Arduino.h>
#include <ESP32-HUB75-VirtualMatrixPanel_T.hpp>
#include <Fonts/FreeSerifBold9pt7b.h>

/**

Configuration of the LED matrix panels number and individual pixel resolution.
**/
#define PANEL_RES_X 64 // Number of pixels wide of each INDIVIDUAL panel module.
#define PANEL_RES_Y 32 // Number of pixels tall of each INDIVIDUAL panel module.

#define VDISP_NUM_ROWS 2 // Number of rows of individual LED panels
#define VDISP_NUM_COLS 2 // Number of individual LED panels per row

#define PANEL_CHAIN_LEN (VDISP_NUM_ROWS * VDISP_NUM_COLS) // Don't change

/**

Configuration of the approach used to chain all the individual panels together.
Refer to the documentation or check the enum 'PANEL_CHAIN_TYPE' in VirtualMatrixPanel_T.hpp for options.
**/
#define PANEL_CHAIN_TYPE CHAIN_TOP_RIGHT_DOWN

/**

Optional config for the per-panel pixel mapping, for non-standard panels.
i.e. 1/4 scan panels, or outdoor panels. They're a pain in the a-- and all

 have their own weird pixel mapping that is not linear.

This is used for Examples 2 and 3.

**/
#define PANEL_SCAN_TYPE FOUR_SCAN_32PX_HIGH

/**

Mandatory declaration of the dma_display. DO NOT CHANGE
*/
MatrixPanel_I2S_DMA dma_display = nullptr;

// ------------------------------------------------------------------------------------------------------------

// --- Example 1: STANDARD 1/2 Scan ---

// Declare a pointer to the specific instantiation:
VirtualMatrixPanel_T<PANEL_CHAIN_TYPE>* virtualDisp = nullptr;

int16_t xOne, yOne;
uint16_t w, h;

int16_t fxOne, fyOne;
uint16_t fw, fh;

unsigned long isAnimationDue;
int delayBetweeenAnimations = 25; // Smaller == faster

// int textXPosition = PANEL_RES_X * PANEL_CHAIN_LEN; // Will start off screen
int textXPosition = 64 * 2; // Will start off screen

// int textYPosition = PANEL_RES_Y / 2 - 8; // center of screen - 8 (half of the text height)
int textYPosition = 8;

uint16_t myBLACK = dma_display->color565(0, 0, 0);
uint16_t myWHITE = dma_display->color565(255, 255, 255);
uint16_t myRED = dma_display->color565(255, 0, 0);
uint16_t myGREEN = dma_display->color565(0, 255, 0);
uint16_t myBLUE = dma_display->color565(0, 0, 255);

String scrollText = "Scroll Text";
String fixedText = "Fix";

void setup() {
Serial.begin(115200);
delay(2000);

HUB75_I2S_CFG mxconfig(
PANEL_RES_X,
PANEL_RES_Y,
PANEL_CHAIN_LEN
//, _pins
);

mxconfig.double_buff = true;
mxconfig.i2sspeed = HUB75_I2S_CFG::HZ_10M;
mxconfig.clkphase = false;
//mxconfig.driver = HUB75_I2S_CFG::FM6126A;

dma_display = new MatrixPanel_I2S_DMA(mxconfig);
dma_display->begin();
dma_display->setBrightness8(128); //0-255
dma_display->clearScreen();

virtualDisp = new VirtualMatrixPanel_T<PANEL_CHAIN_TYPE>(VDISP_NUM_ROWS, VDISP_NUM_COLS, PANEL_RES_X, PANEL_RES_Y);

virtualDisp->setDisplay(*dma_display);
virtualDisp->clearScreen();

virtualDisp->fillScreen(myBLACK);

virtualDisp->setTextSize(1); // size 2 == 16 pixels high
virtualDisp->setTextWrap(false); // N.B!! Don't wrap at end of line
virtualDisp->setTextColor(myRED);

String scrollText1 = "ABC";
Serial.println(scrollText1);
// virtualDisp->setFont(&FreeSerifBold9pt7b);

// scrollText1 = scrollText1.substring(0, scrollText1.length() - 1);
// Serial.println(scrollText1);
// scrollText1 = scrollText1.substring(0, scrollText1.length() - 1);
// Serial.println(scrollText1);
}

void loop() {

dma_display->flipDMABuffer();
delay(1000 / dma_display->calculated_refresh_rate);
dma_display->clearScreen();
delay(25);

unsigned long now = millis();
if (now > isAnimationDue) {
isAnimationDue = now + delayBetweeenAnimations;
textXPosition -= 1;

// Checking is the very right of the text off screen to the left
virtualDisp->getTextBounds(scrollText, textXPosition, textYPosition, &xOne, &yOne, &w, &h);
if (textXPosition + w <= 0) {
  textXPosition = 64 * 2;
}
virtualDisp->setCursor(textXPosition, textYPosition);
virtualDisp->print(scrollText);

}

virtualDisp->setCursor(0, textYPosition);
virtualDisp->print(fixedText);

// Serial.println("textXPosition + w");
// Serial.println(textXPosition + w);

// Serial.println("textXPosition");
// Serial.println(textXPosition);
// Serial.println("textYPosition");
// Serial.println(textYPosition);
}`

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Scrolling Text and Fixed Text using double buffer #791

Scrolling Text and Fixed Text using double buffer #791

ARPROJECT26 commented May 7, 2025

board707 commented May 7, 2025

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ARPROJECT26 commented May 7, 2025 •

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Scrolling Text and Fixed Text using double buffer #791

Scrolling Text and Fixed Text using double buffer #791

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ARPROJECT26 commented May 7, 2025

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