touch_coords_legacy.tc

touch_coords_legacy.tc — live touch coordinates using the LEGACY (non-LVGL) display API.

Source on GitHub

// touch_coords_legacy.tc — live touch coordinates using the LEGACY (non-LVGL) display API.
//
// Mirror of touch_coords.tc, but draws straight to the framebuffer (dspText/dspFillCircle) so it
// verifies touch tracking under DisplayRotate in NORMAL (non-LVGL) mode. touchGet() returns the
// post-rotation coords (Touch_Status / TS_RotConvert); the red dot is drawn there via the legacy
// renderer (drawPixel). GREEN markers sit at every corner + edge midpoint (in screen coords) so
// you can see exactly where the dot lands vs each edge — handy for the rot 1/3 touch offset.
//
//   touchGet(0) -> 1 if pressed   touchGet(1) -> x   touchGet(2) -> y

int ox;
int oy;
int op;
int lw;

void drawMarkers() {
    int W = dspWidth();
    int H = dspHeight();
    dspColor(0x07E0, 0x0000);                 // green
    dspPos(0, 0);          dspFillRect(26, 26);          // TL
    dspPos(W - 26, 0);     dspFillRect(26, 26);          // TR
    dspPos(0, H - 26);     dspFillRect(26, 26);          // BL
    dspPos(W - 26, H - 26); dspFillRect(26, 26);         // BR
    dspPos(W / 2 - 13, 0);      dspFillRect(26, 13);     // top mid
    dspPos(W / 2 - 13, H - 13); dspFillRect(26, 13);     // bottom mid
    dspPos(0, H / 2 - 13);      dspFillRect(13, 26);     // left mid
    dspPos(W - 13, H / 2 - 13); dspFillRect(13, 26);     // right mid
    dspSize(2);
    dspPos(32, 4);          dspText("TL");
    dspPos(W - 64, 4);      dspText("TR");
    dspPos(32, H - 24);     dspText("BL");
    dspPos(W - 64, H - 24); dspText("BR");
}

int main() {
    dspColor(0xFFFF, 0x0000);
    dspClear();
    dspUpdate();
    ox = 0; oy = 0; op = 0;
    lw = dspWidth();

    while (1) {
        if (dspWidth() != lw) {                 // orientation changed -> full clear once
            lw = dspWidth();
            dspColor(0xFFFF, 0x0000); dspClear();
            op = 0;
        }

        int p = touchGet(0);
        int x = touchGet(1);
        int y = touchGet(2);

        if (op == 1) {                          // erase the previous dot
            dspColor(0x0000, 0x0000); dspPos(ox, oy); dspFillCircle(20);
        }

        dspColor(0x0000, 0x0000); dspPos(34, 40); dspFillRect(520, 72);   // wipe text area (2 lines)
        dspColor(0xFFFF, 0x0000); dspSize(3); dspPos(38, 44);
        char buf[56];
        sprintf(buf, "x=%d y=%d %s", x, y, p == 1 ? "PRESSED" : "rel");
        dspText(buf);
        dspColor(0x07E0, 0x0000); dspSize(2); dspPos(38, 80);
        char buf2[40];
        sprintf(buf2, "W=%d H=%d", dspWidth(), dspHeight());
        dspText(buf2);

        drawMarkers();

        if (p == 1) {                           // draw the dot at the touch point
            dspColor(0xF800, 0x0000); dspPos(x, y); dspFillCircle(18);
            ox = x; oy = y;
        }

        op = p;
        dspUpdate();
        delay(40);
    }
    return 0;
}