Touchscreen Draw

This example demonstrates how to draw on the screen using the capacitive touchscreen on Inkplate 6FLICK. By dragging your finger across the screen, lines are drawn in real time, allowing basic interaction with the display.

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Example Overview

This example checks for touch input and draws lines between the last touch position and the current one. You can use your finger or a stylus to draw directly onto the e-paper display.

#include "Inkplate.h"

// Select to draw a line on screen or filled circle
#define DRAW_LINE
// #define DRAW_CIRCLE

Inkplate display(INKPLATE_1BIT);

#ifdef DRAW_LINE
uint16_t xOld, yOld;
#endif

void setup()
{
    // put your setup code here, to run once:
    Serial.begin(115200);
    display.begin();
    display.display();
    // Init touchscreen and power it on after init (send false as argument to put it in deep sleep right after init)
    if (display.touchscreen.init(true))
    {
        Serial.println("Touchscreen init ok");
    }
    else
    {
        Serial.println("Touchscreen init fail");
        while (true)
            ;
    }
}

void loop()
{
    // Check if there is any touch detected
    if (display.touchscreen.available())
    {
        uint8_t n;
        uint16_t x[2], y[2];
        // See how many fingers are detected (max 2) and copy x and y position of each finger on touchscreen
        n = display.touchscreen.getData(x, y);
        if (n != 0)
        {
#ifdef DRAW_LINE // Draw line from old point to new
            display.drawLine(xOld, yOld, x[0], y[0], BLACK);

            // Save coordinates to use as old next time
            xOld = x[0];
            yOld = y[0];
#endif

#ifdef DRAW_CIRCLE // Draw circle on touch event coordinates
            display.fillCircle(x[0], y[0], 20, BLACK);
#endif
            display.partialUpdate();
        }
    }
}

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touchDetected()

Returns true if the capacitive touchscreen detects input.

Returns type: bool

touchCoordinates()

Gets the X and Y position of the last touch point.

Returns type: void

Function parameters:

Type	Name	Description
int*	x	Pointer to store the X coordinate
int*	y	Pointer to store the Y coordinate

partialUpdate()

Refreshes only the updated section of the screen to save power and time.

Returns type: void

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Notes

• The touchscreen on Inkplate 6FLICK is a capacitive touch sensor that works best with bare fingers.
• partialUpdate() allows fast screen refreshes while interacting, avoiding full refresh flashes.

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Full example

You can find the complete example in the Inkplate Arduino library here:

Inkplate6FLICK_Touchscreen_Draw

Touchscreen drawing demo for Inkplate 6FLICK.