graphics/field.cpp
/*******************************************************
* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* https://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <arrayfire.h>
#include <math.h>
#include <cstdio>
using namespace af;
const static float MINIMUM = -3.0f;
const static float MAXIMUM = 3.0f;
const static float STEP = 0.18f;
int main(int, char**) {
try {
af::Window myWindow(1024, 1024, "2D Vector Field example: ArrayFire");
myWindow.grid(1, 2);
array dataRange = seq(MINIMUM, MAXIMUM, STEP);
array x = tile(dataRange, 1, dataRange.dims(0));
array y = tile(dataRange.T(), dataRange.dims(0), 1);
x.eval();
y.eval();
float scale = 2.0f;
do {
array points = join(1, flat(x), flat(y));
array saddle = join(1, flat(x), -1.0f * flat(y));
array bvals = sin(scale * (x * x + y * y));
array hbowl = join(1, constant(1, x.elements()), flat(bvals));
hbowl.eval();
myWindow(0, 0).vectorField(points, saddle, "Saddle point");
myWindow(0, 1).vectorField(
points, hbowl, "hilly bowl (in a loop with varying amplitude)");
myWindow.show();
scale -= 0.0010f;
if (scale < -0.01f) { scale = 2.0f; }
} while (!myWindow.close());
} catch (af::exception& e) {
fprintf(stderr, "%s\n", e.what());
throw;
}
return 0;
}