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Lay out text on a page observing word boundaries

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This commit is contained in:
Correl Roush 2023-01-29 14:16:10 -05:00
parent 94de526f52
commit d443129f38
1 changed files with 95 additions and 12 deletions
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107
src/main.cpp
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@ -6,6 +6,8 @@
#include <sntp.h>
#include "config.h"
using namespace std;
class App {
public:
enum Choices {Clock, System, OTA, Text};
@ -179,21 +181,20 @@ public:
class Text: public App {
public:
Text() {
String sample =
"I've seen things you people wouldn't believe.\n"
"Attack ships on fire off the shoulder of Orion.\n"
"I watched c-beams glitter in the dark near the Tannhäuser Gate.\n"
"All those moments will be lost in time, like tears in rain.\n"
"Time to die.";
M5.Display.startWrite();
M5.Display.setEpdMode(epd_quality);
M5.Display.clearDisplay(TFT_WHITE);
auto font = &fonts::FreeSans9pt7b;
lgfx::v1::FontMetrics metrics;
font->getDefaultMetric(&metrics);
M5.Display.setFont(font);
M5.Display.setTextSize(3);
auto t_x = M5.Display.getTextSizeX();
auto t_y = M5.Display.getTextSizeY();
auto t_p = M5.Display.getTextPadding();
M5.Display.setFont(&fonts::FreeSans9pt7b);
M5.Display.setTextSize(2);
M5.Display.setCursor(0, 0);
M5.Display.printf("FreeSans9pt7b\n");
auto c_y = M5.Display.getCursorY();
M5.Display.printf("Y: %d\nH: %2.2f\nW:%2.2f\nPadding: %d\n", c_y, t_y, t_x, t_p);
M5.Display.printf("Y Advance: %d\n", metrics.y_advance); // This here, this is the actual Y height of the text
printPage(M5.Display, sample);
M5.Display.endWrite();
}
App::Choices loop() {
return App::Text;
@ -201,6 +202,88 @@ public:
void shutdown() {
}
protected:
uint8_t getTextHeight(M5GFX display) {
const lgfx::v1::IFont* font = display.getFont();
lgfx::v1::FontMetrics metrics;
font->getDefaultMetric(&metrics);
return metrics.y_advance * display.getTextSizeY();
}
bool endOfPage(M5GFX display) {
return display.getCursorY() + getTextHeight(display) > display.height();
}
int printPage(M5GFX display, String s, int index = 0) {
int next = index;
bool in_whitespace = false;
display.setTextWrap(false, false);
for (int i = index; i < s.length(); i++) {
if (endOfPage(display)) {
break;
}
if (s.charAt(i) == '\n') {
if (! in_whitespace) {
String word = s.substring(next, i);
if (display.textWidth(word) + display.getCursorX() > display.width()) {
display.print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
next = i;
} else {
display.print(word);
next = i;
}
}
in_whitespace = true;
display.print("\n");
if (endOfPage(display)) {
break;
}
} else if (s.charAt(i) == ' ') {
if (! in_whitespace) {
String word = s.substring(next, i);
if (display.textWidth(word) + display.getCursorX() > display.width()) {
display.print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
next = i;
} else {
display.print(word);
next = i;
}
}
in_whitespace = true;
next = i;
} else if (i == s.length() - 1) {
// End of the input, print it if we can.
String word = s.substring(next);
if (display.textWidth(words) + display.getCursorX() > display.width()) {
display.print("\n");
if (endOfPage(display)) {
break;
}
word.trim();
display.print(word);
next = i;
} else {
display.print(word);
next = i;
}
} else {
in_whitespace = false;
}
}
return next;
}
};
App* app;