Draw a Heart Shape on Android with UiAutomator Math Functions

The author wanted to create a heart-shaped pattern on an Android device using UiAutomator's math utilities and share the solution for feedback.

By applying the polar equation of a heart, the method first computes a series of angles, then converts the mathematical (x, y) coordinates to screen coordinates because the device's coordinate system differs from the standard Cartesian system.

Key parameters are x and y for the heart's center and r for its radius. The implementation follows these steps:

Calculate the angle increment d = Math.PI / 30 and fill an angle array of 61 values.

Compute the horizontal offsets ox using r * (2 * Math.cos(angle[i]) - Math.cos(2 * angle[i])).

Compute the vertical offsets oy using r * (2 * Math.sin(angle[i]) - Math.sin(2 * angle[i])).

Create a Point[] heart array, translate each offset to screen coordinates ( heart[i].x = (int) oy[i] + x, heart[i].y = -(int) ox[i] + y), and store the points.

Finally, invoke getUiDevice().swipe(heart, 2) to draw the heart on the screen.

public void heart(int x, int y, int r) {
    double d = (double) (Math.PI / 30);
    double[] angle = new double[61]; // set angle step
    for (int i = 0; i < 61; i++) {
        angle[i] = i * d;
    }
    double[] ox = new double[61];
    for (int i = 0; i < 61; i++) {
        ox[i] = r * (2 * Math.cos(angle[i]) - Math.cos(2 * angle[i]));
    }
    double[] oy = new double[61];
    for (int i = 0; i < 61; i++) {
        oy[i] = r * (2 * Math.sin(angle[i]) - Math.sin(2 * angle[i]));
    }
    Point[] heart = new Point[61];
    for (int i = 0; i < 61; i++) {
        heart[i] = new Point();
        heart[i].x = (int) oy[i] + x;
        heart[i].y = -(int) ox[i] + y;
    }
    getUiDevice().swipe(heart, 2);
}

This method is similar to drawing a circle but modifies the mathematical formula and rotates the coordinates to produce a heart shape.