<![CDATA[Writing and re-writing text?]]>I'm trying to create a text area on the screen where I can write some text (like a sensor value) and then periodically replace this with new text somehow. I can't find anything about how to do common operations like this. How do I erase the prior value and replace it with the new value? thanks

]]>https://community.m5stack.com/topic/4180/writing-and-re-writing-textRSS for NodeWed, 29 Apr 2026 04:47:43 GMTMon, 04 Apr 2022 13:55:34 GMT60<![CDATA[Reply to Writing and re-writing text? on Thu, 07 Apr 2022 13:53:12 GMT]]>@macsbug Thank you!

]]>https://community.m5stack.com/post/17124https://community.m5stack.com/post/17124Thu, 07 Apr 2022 13:53:12 GMT<![CDATA[Reply to Writing and re-writing text? on Wed, 06 Apr 2022 02:44:02 GMT]]>Hello @david-bethesda

Use "backgroundcolor"

setTextColor(uint16_t color, uint16_t backgroundcolor);
m5-docs/docs/en/api/lcd.md
https://github.com/m5stack/m5-docs/blob/master/docs/en/api/lcd.md

#include <M5Stack.h>
void setup() {
M5.begin();
M5.Lcd.setTextSize(2);

// Numerical Value
M5.Lcd.setCursor(5, 10);
M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
M5.Lcd.println(123456.78);
M5.Lcd.setCursor(5, 10);
M5.Lcd.println(" "); // "........."
M5.Lcd.setCursor(5, 10);
M5.Lcd.println(1.41);

// Stirng
M5.Lcd.setCursor(5, 50);
M5.Lcd.println("987654.32");
M5.Lcd.setCursor(5, 50);
M5.Lcd.println(" "); // "........."
M5.Lcd.setCursor(5, 50);
M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
M5.Lcd.println("3.14");

}

void loop() {

}

If there is no background color
0_1649211605482_t1.png

If there is a background color
0_1649211646347_t2.png

]]>https://community.m5stack.com/post/17105https://community.m5stack.com/post/17105Wed, 06 Apr 2022 02:44:02 GMT<![CDATA[Reply to Writing and re-writing text? on Wed, 06 Apr 2022 00:34:01 GMT]]>@agreedk thanks! I guess that means I have to figure out how tall a font is in pixels, and how wide the phrase is, ugh. Feels very imprecise and clunky.

]]>https://community.m5stack.com/post/17104https://community.m5stack.com/post/17104Wed, 06 Apr 2022 00:34:01 GMT<![CDATA[Reply to Writing and re-writing text? on Tue, 05 Apr 2022 17:09:20 GMT]]>@david-bethesda you select where to write the text, x & y, then make a function to first erase the area with fill rect and then write the new text at x,y

]]>https://community.m5stack.com/post/17101https://community.m5stack.com/post/17101Tue, 05 Apr 2022 17:09:20 GMT<![CDATA[Reply to Writing and re-writing text? on Tue, 05 Apr 2022 16:07:13 GMT]]>Thanks @ajb2k3 but I'm writing this particular code in C++ / Arduino so I'm using M5.Lcd

]]>https://community.m5stack.com/post/17100https://community.m5stack.com/post/17100Tue, 05 Apr 2022 16:07:13 GMT<![CDATA[Reply to Writing and re-writing text? on Tue, 05 Apr 2022 14:39:41 GMT]]>You can hold use a label to display a sensor value and place it inside a loop so that it will constantly check the sensors reading and update the value.

]]>https://community.m5stack.com/post/17099https://community.m5stack.com/post/17099Tue, 05 Apr 2022 14:39:41 GMT