Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.PointF;

public class Main {
    public static void barrelDistortion(double paramA, double paramB, double paramC, PointF src) {

        double paramD = 1.0 - paramA - paramB - paramC; // describes the linear scaling of the image

        float d = 1.0f;

        // center of dst image
        double centerX = 0f;
        double centerY = 0f;

        if (src.x == centerX && src.y == centerY) {
            return;
        }

        // cartesian coordinates of the destination point (relative to the centre of the image)
        double deltaX = (src.x - centerX) / d;
        double deltaY = (src.y - centerY) / d;

        // distance or radius of dst image
        double dstR = Math.sqrt(deltaX * deltaX + deltaY * deltaY);

        // distance or radius of src image (with formula)
        double srcR = (paramA * dstR * dstR * dstR + paramB * dstR * dstR + paramC * dstR + paramD) * dstR;

        // comparing old and new distance to get factor
        double factor = Math.abs(dstR / srcR);

        // coordinates in source image
        float xResult = (float) (centerX + (deltaX * factor * d));
        float yResult = (float) (centerY + (deltaY * factor * d));

        src.set(xResult, yResult);
    }
}