Hello folks,
I am seeking some help editing the contents of a bar chart at runtime in LVGL 8.3.11.
Here is the plotting function:
void drawAutoScaledBarGraph(uint8_t numOfBars, int values[], String xTicks[]) {
lv_chart_series_t* ui_mainGraph_series_1 = lv_chart_add_series(ui_mainGraph, lv_color_hex(0x686868), LV_CHART_AXIS_PRIMARY_Y);
// Count the number of non-zero values
int nonZeroCount = 0;
for (int i = 0; i < numOfBars; i++) {
if (values[i] > 0) {
nonZeroCount++;
}
}
// Dynamically allocate memory for the series array
lv_coord_t* ui_mainGraph_series_1_array = new lv_coord_t[nonZeroCount];
// Loop through each bar and draw it only if the value is greater than 0
int drawnBars = 0;
for (int i = 0; i < numOfBars; i++) {
if (values[i] > 0 && values[i] < 60) {
ui_mainGraph_series_1_array[drawnBars] = values[i];
drawnBars++;
}
}
lv_chart_set_axis_tick(ui_mainGraph, LV_CHART_AXIS_PRIMARY_X, 10, 0, drawnBars, 1, true, 50);
lv_chart_set_ext_y_array(ui_mainGraph, ui_mainGraph_series_1, ui_mainGraph_series_1_array);
// Print the number of drawn bars
Serial.print("Drawn Bars:\t");
Serial.println(drawnBars);
}
The expectation is to see a bar chart with number of bars matching the count in drawnBars.
However, this is the result. Looks like multiple bars are drawn in clusters at each “xtick”
