321 lines
10 KiB
C++
321 lines
10 KiB
C++
/*
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This example draws fonts (as used by the Adafruit_GFX library) onto the
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screen. These fonts are called the GFX Free Fonts (GFXFF) in this library.
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Other True Type fonts could be converted using the utility within the
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"fontconvert" folder inside the library. This converted has also been
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copied from the Adafruit_GFX library.
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Since these fonts are a recent addition Adafruit do not have a tutorial
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available yet on how to use the utility. Linux users will no doubt
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figure it out! In the meantime there are 48 font files to use in sizes
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from 9 point to 24 point, and in normal, bold, and italic or oblique
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styles.
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This example sketch uses both the print class and drawString() functions
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to plot text to the screen.
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Make sure LOAD_GFXFF is defined in the User_Setup.h file within the
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TFT_eSPI library folder.
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--------------------------- NOTE ----------------------------------------
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The free font encoding format does not lend itself easily to plotting
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the background without flicker. For values that changes on screen it is
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better to use Fonts 1- 8 which are encoded specifically for rapid
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drawing with background.
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-------------------------------------------------------------------------
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>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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As supplied with the default settings the sketch has 11 fonts loaded,
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i.e. GLCD (Font 1), Font 2, Font 4, Font 6, Font 7, Font 8 and five Free Fonts,
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even though they are not all used in the sketch.
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Disable fonts you do not need in User_Setup.h in the library folder.
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#########################################################################
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###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
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#########################################################################
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*/
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#include "Free_Fonts.h" // Include the header file attached to this sketch
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#include "SPI.h"
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#include "TFT_eSPI.h"
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// Use hardware SPI
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TFT_eSPI tft = TFT_eSPI();
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unsigned long drawTime = 0;
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void setup(void) {
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tft.begin();
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tft.setRotation(1);
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}
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void loop() {
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int xpos = 0;
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int ypos = 40;
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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// Select different fonts to draw on screen using the print class
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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header("Using print() method", TFT_NAVY);
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// For comaptibility with Adafruit_GFX library the text background is not plotted when using the print class
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// even if we specify it.
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tft.setTextColor(TFT_YELLOW);
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tft.setCursor(xpos, ypos); // Set cursor near top left corner of screen
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tft.setFreeFont(TT1); // Select the orginal small TomThumb font
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tft.println(); // Move cursor down a line
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tft.print("The really tiny TomThumb font"); // Print the font name onto the TFT screen
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tft.println();
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tft.println();
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tft.setFreeFont(FSB9); // Select Free Serif 9 point font, could use:
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// tft.setFreeFont(&FreeSerif9pt7b);
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tft.println(); // Free fonts plot with the baseline (imaginary line the letter A would sit on)
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// as the datum, so we must move the cursor down a line from the 0,0 position
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tft.print("Serif Bold 9pt"); // Print the font name onto the TFT screen
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tft.setFreeFont(FSB12); // Select Free Serif 12 point font
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tft.println(); // Move cursor down a line
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tft.print("Serif Bold 12pt"); // Print the font name onto the TFT screen
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tft.setFreeFont(FSB18); // Select Free Serif 12 point font
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tft.println(); // Move cursor down a line
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tft.print("Serif Bold 18pt"); // Print the font name onto the TFT screen
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tft.setFreeFont(FSB24); // Select Free Serif 24 point font
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tft.println(); // Move cursor down a line
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tft.print("Serif Bold 24pt"); // Print the font name onto the TFT screen
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delay(4000);
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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// Now use drawString() so we can set font background colours and the datum
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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header("Using drawString()", TFT_BLACK);
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tft.setTextColor(TFT_WHITE, TFT_BLACK);
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tft.setTextDatum(TC_DATUM); // Centre text on x,y position
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xpos = tft.width() / 2; // Half the screen width
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ypos = 50;
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tft.setFreeFont(FSB9); // Select the font
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tft.drawString("Serif Bold 9pt", xpos, ypos, GFXFF); // Draw the text string in the selected GFX free font
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ypos += tft.fontHeight(GFXFF); // Get the font height and move ypos down
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tft.setFreeFont(FSB12);
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tft.drawString("Serif Bold 12pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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tft.setFreeFont(FSB18);
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tft.drawString("Serif Bold 18pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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tft.setFreeFont(FSB24);
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tft.drawString("Serif Bold 24pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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// Set text padding to 100 pixels wide area to over-write old values on screen
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tft.setTextPadding(100);
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for (int i = 0; i <= 20; i++) {
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tft.drawFloat(i / 10.0, 1, xpos, ypos, GFXFF);
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delay (200);
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}
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delay(4000);
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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// Same again but with colours that show bounding boxes
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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header("With background", TFT_DARKGREY);
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tft.setTextColor(TFT_YELLOW, TFT_BLACK);
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tft.setTextDatum(TC_DATUM); // Centre text on x,y position
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xpos = tft.width() / 2; // Half the screen width
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ypos = 50;
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tft.setFreeFont(FSB9); // Select the font
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tft.drawString("Serif Bold 9pt", xpos, ypos, GFXFF); // Draw the text string in the selected GFX free font
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ypos += tft.fontHeight(GFXFF); // Get the font height and move ypos down
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tft.setFreeFont(FSB12);
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tft.drawString("Serif Bold 12pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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tft.setFreeFont(FSB18);
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tft.drawString("Serif Bold 18pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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tft.setFreeFont(FSBI24);
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tft.drawString("Bold Italic 24pt", xpos, ypos, GFXFF);
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ypos += tft.fontHeight(GFXFF);
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// Set text padding to 100 pixels wide area to over-write old values on screen
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tft.setTextPadding(100);
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for (int i = 0; i <= 20; i++) {
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tft.drawFloat(i / 10.0, 1, xpos, ypos, GFXFF);
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delay (200);
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}
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delay(4000);
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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// Now show setting the 12 datum positions works with free fonts
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// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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// Numbers, floats and strings can be drawn relative to a datum
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header("Text with a datum", TFT_BLACK);
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tft.setTextColor(TFT_DARKGREY, TFT_BLACK);
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tft.setFreeFont(FSS12);
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tft.setTextDatum(TL_DATUM);
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tft.drawString("[Top left]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(TC_DATUM);
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tft.drawString("[Top centre]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(TR_DATUM);
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tft.drawString("[Top right]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(ML_DATUM);
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tft.drawString("[Middle left]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(MC_DATUM);
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tft.drawString("[Middle centre]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(MR_DATUM);
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tft.drawString("[Middle right]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(BL_DATUM);
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tft.drawString("[Bottom left]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(BC_DATUM);
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tft.drawString("[Bottom centre]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(BR_DATUM);
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tft.drawString("[Bottom right]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(L_BASELINE);
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tft.drawString("[Left baseline]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(C_BASELINE);
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tft.drawString("[Centre baseline]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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tft.fillRect(0, 80, 320, 80, TFT_BLACK);
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tft.setTextDatum(R_BASELINE);
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tft.drawString("[Right baseline]", 160, 120, GFXFF);
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drawDatumMarker(160,120);
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delay(1000);
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//while(1);
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delay(8000);
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}
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// Print the header for a display screen
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void header(const char *string, uint16_t color)
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{
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tft.fillScreen(color);
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tft.setTextSize(1);
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tft.setTextColor(TFT_MAGENTA, TFT_BLUE);
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tft.fillRect(0, 0, 320, 30, TFT_BLUE);
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tft.setTextDatum(TC_DATUM);
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tft.drawString(string, 160, 2, 4); // Font 4 for fast drawing with background
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}
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// Draw a + mark centred on x,y
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void drawDatumMarker(int x, int y)
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{
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tft.drawLine(x - 5, y, x + 5, y, TFT_GREEN);
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tft.drawLine(x, y - 5, x, y + 5, TFT_GREEN);
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}
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// There follows a crude way of flagging that this example sketch needs fonts which
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// have not been enbabled in the User_Setup.h file inside the TFT_HX8357 library.
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//
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// These lines produce errors during compile time if settings in User_Setup are not correct
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//
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// The error will be "does not name a type" but ignore this and read the text between ''
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// it will indicate which font or feature needs to be enabled
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//
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// Either delete all the following lines if you do not want warnings, or change the lines
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// to suit your sketch modifications.
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#ifndef LOAD_GLCD
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//ERROR_Please_enable_LOAD_GLCD_in_User_Setup
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#endif
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#ifndef LOAD_FONT2
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//ERROR_Please_enable_LOAD_FONT2_in_User_Setup!
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#endif
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#ifndef LOAD_FONT4
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//ERROR_Please_enable_LOAD_FONT4_in_User_Setup!
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#endif
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#ifndef LOAD_FONT6
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//ERROR_Please_enable_LOAD_FONT6_in_User_Setup!
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#endif
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#ifndef LOAD_FONT7
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//ERROR_Please_enable_LOAD_FONT7_in_User_Setup!
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#endif
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#ifndef LOAD_FONT8
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//ERROR_Please_enable_LOAD_FONT8_in_User_Setup!
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#endif
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#ifndef LOAD_GFXFF
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ERROR_Please_enable_LOAD_GFXFF_in_User_Setup!
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#endif
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