Back to project page PinchToClose.
The source code is released under:
Apache License
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package lt.marius.pinchtoclose.algo; //www . j ava 2 s . com import android.graphics.Canvas; import android.graphics.Paint; class TriangleArea implements AreaAlgorithm { private float[] x, y; @Override public float area(float x[], float y[]) { if (x.length <= 2 || y.length <= 2) { return 0; } this.x = x; this.y = y; float a = dist(x[0], y[0], x[1], y[1]); float b = dist(x[0], y[0], x[2], y[2]); float c = dist(x[1], y[1], x[2], y[2]); float p = (a + b + c) / 2; float area = (float) Math.sqrt(p * (p - a) * (p - b) * (p - c)); return area; } private float dist(float x1, float y1, float x2, float y2) { return (float)Math.hypot((x2 - x1), (y2 - y1)); } @Override public void visualize(Canvas canvas, Paint paint) { if (x != null && x.length >= 3) { canvas.drawLine(x[0], y[0], x[1], y[1], paint); canvas.drawLine(x[1], y[1], x[2], y[2], paint); canvas.drawLine(x[2], y[2], x[0], y[0], paint); } } }