Cannot canvas.drawString() onto canvas. (M5PaperTouchArea)

[Steve1]

I have made a small modification to RAWSEQ'sexcellent M5PaperTouchArea project.

I am trying to use the spare white area as an output canvas. I can place the CanvasOP (output canvas) correctly and I can check it is really there by filling it in different shades and moving it around. but I cannot write into it. Any canvasOP.drawString() commands seem to be ignored. I have tried changing the text color, size and position but I cannot seem to get text to show up on the pushed canvasOP.

#include <M5EPD.h>
#include "M5PaperTouchArea.h"
#include "MPlusFontsSubset.h"

// M5EPD Canvas
M5EPD_Canvas canvas(&M5.EPD);
M5EPD_Canvas canvasOP(&M5.EPD);

// Module (Grid & TouchArea)
M5PaperTouchAreas _m5pta;

// Module (Grid Only)
GridUtil _gu;

void setup() {

  // Display Setup
  M5.begin();
  M5.EPD.SetRotation(90);
  M5.TP.SetRotation(90);
  M5.EPD.Clear(true);
  canvas.loadFont(MPlusFontsSubset, sizeof(MPlusFontsSubset));
  canvas.createCanvas(540, 960);
  canvas.createRender(48, 256);
  canvas.fillRect(0, 0, 540, 960, 10);
  _m5pta.current_canvas = &canvas;
  _m5pta.getGutil()->setVertical(true);
  _gu.setVertical(true);

  // Event Setting
  _m5pta.e_touch.func = bTouch;
  _m5pta.e_release.func = bRelease;

  // Change Default Setting
  _m5pta.default_font_size = 48;
  _m5pta.default_radius = 15;
  _m5pta.default_font_linepos = 6;
  _m5pta.default_bc = { 13, 0, 0 };

  // Touch Area Test
  _m5pta.add_grid(1, 1, 1, 1, "B1", "b1");
  _m5pta.add_grid(2, 1, 1, 1, "B2", "b2");
  _m5pta.add_grid(3, 1, 1, 1, "B3", "b3");
  _m5pta.add_grid(4, 1, 1, 1, "B4", "b4");
  _m5pta.add_grid(5, 1, 1, 1, "B5", "b5");
  _m5pta.add_grid(1, 2, 3, 1, "B6", "b6");
  _m5pta.add_grid(4, 2, 2, 1, "B7", "b7");
  _m5pta.add_grid(1, 3, 2, 1, "B8", "b8");
  _m5pta.add_grid(3, 3, 3, 1, "B9", "b9");
  _m5pta.add_grid(1, 4, 5, 1, "B10 Steve", "Steve");
  _m5pta.add_grid(1, 5, 2, 1, "B11", "b11");
  //_m5pta.add_grid(3, 5, 3, 2, "B16", "b16");//added by steve
  _m5pta.add_grid(1, 6, 2, 2, "B12", "b12");
  _m5pta.add_grid(3, 7, 3, 3, "B13", "b13");
  _m5pta.add_grid(1, 8, 2, 1, "B14", "b14");
  _m5pta.add_grid(1, 9, 2, 1, "B15", "b15");
  _m5pta.draw();

  // Grid Draw Test
 // GURect g = _gu.convert(3, 5, 3, 2);
//  canvas.setTextColor(10);
 // canvas.fillRect(g.x, g.y, g.w, g.h, 0);
  canvas.pushCanvas(0, 0, UPDATE_MODE_GC16);
 /*  Serial.print(g.x);
  Serial.print("...");
  Serial.print(g.y);
    Serial.print("...");
  Serial.print(g.w);  
  Serial.print("...");
  Serial.print(g.h);*/
  //230...440...290...180 g.cordinates
  canvasOP.createCanvas(290, 180);
  //canvasOP.fillCanvas(5);
  canvasOP.setTextSize(4);
  canvasOP.setTextColor(15);
  canvasOP.drawString("Hello", 20, 100);
  canvasOP.pushCanvas(230, 440, UPDATE_MODE_GC16);
}

// Touch Event
void bTouch(M5PTAEventContext& ct) {
  Serial.println("T:" + ct.code);

}

// Release Event
void bRelease(M5PTAEventContext& ct) {
  Serial.println("R:" + ct.code);

}

void loop() {
  _m5pta.loop();
}

[Steve1]

I am just starting out with the M5Paper and a lot of things are taking some getting use to. I thought about deleting this thread when I found out how easy the solution was but then I thought that maybe this will help someone else. So here is the solution:

You have to declare a font for use in the canvasOP. So adding his line after creating canvasOP fixes the problem:
canvasOP.setFreeFont(&FreeSerif24pt7b);