Needle animation over static image background

[zdravke]

Hi, I’m wondering if I’m using sprites in the most efficient way. I have ESP32-WROOM with st7789 1.9inch display and trying to animate smooth vu meter needle over a preloaded vu meter background.

void drawNeedles(float mainAngle, float peakAngle) {
// 1. Draw the background in the area where the needle will move
needleSprite.pushImage(0, 0, 320, HEIGHT, background); // Full background redraw

// 2. Draw the peak needle
float rad = peakAngle * DEG_TO_RAD;
float tipX = needleCenterX - needleLength * cos(rad);
float tipY = needleCenterY - needleLength * sin(rad);
float baseX = needleCenterX + (tipX - needleCenterX) * (needleCenterY - HEIGHT) / (needleCenterY - tipY);
float baseY = HEIGHT;
needleSprite.drawWideLine(baseX, baseY, tipX, tipY, 1, NEEDLE_COLOR, TFT_ORANGE);

// 3. Draw the main needle
rad = mainAngle * DEG_TO_RAD;
tipX = needleCenterX - needleLength * cos(rad);
tipY = needleCenterY - needleLength * sin(rad);
baseX = needleCenterX + (tipX - needleCenterX) * (needleCenterY - HEIGHT) / (needleCenterY - tipY);
baseY = HEIGHT;
needleSprite.drawWideLine(baseX, baseY, tipX, tipY, 3, NEEDLE_COLOR, TFT_ORANGE);

// 4. Push the sprite to the screen
needleSprite.pushSprite(0, 0);
}

I am aware that I’m redrawing full screen instead of dirty rectangle and would like to know if esprite can take care of it automatically.

[Basitadam]

Did this a while ago. Might give some clues
ESP32_128_4MB_Sprite_RotatedNeedle.zip