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/*
* Copyright (c) 2015-2016 Intel Corporation. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef bumpbox_h
#define bumpbox_h
#include <assert.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
/// class to hide box bump logical
/// the inner rect will bump back when it hit outerrect.
///
class BumpBox
{
public:
BumpBox(uint32_t outerWidth, uint32_t outerHeight, uint32_t width, uint32_t height, uint32_t step = 5)
:m_width(width), m_height(height)
{
assert(outerWidth > width && outerHeight > height);
m_xMax = outerWidth - width;
m_yMax = outerHeight - height;
m_x = rand() % m_xMax;
m_y = rand() % m_yMax;
//generate dx, dy
uint32_t a = rand()%255 + 1;
uint32_t b = rand()%255 + 1;
double c2 = a*a + b*b;
double c = sqrt(c2);
m_dx = genSign() * (a / c * step);
m_dy = genSign() * (b / c * step);
// printf("(%d, %d, %d, %d)\r\n", outerWidth, outerWidth, width, height);
//printf("a = %d, b = %d, c = %f, a/c = %f\r\n", a, b, c, a/c);
}
void getPos(uint32_t& x, uint32_t& y, uint32_t& width, uint32_t& height)
{
width = m_width;
height = m_height;
//step
m_x += m_dx;
m_y += m_dy;
//clip
if (clip(m_x, 0, m_xMax))
m_dx = -m_dx;
if (clip(m_y, 0, m_yMax))
m_dy = -m_dy;
//now we get the pos
x = m_x;
y = m_y;
}
private:
bool clip(int& a, int left, int right)
{
if (a <= left) {
a = left;
return true;
}
else if (a >= right) {
a = right;
return true;
}
return false;
}
int genSign()
{
int ret = rand() % 2;
if (!ret)
ret = -1;
return ret;
}
int32_t m_x;
int32_t m_y;
double m_dx;
double m_dy;
uint32_t m_xMax;
uint32_t m_yMax;
uint32_t m_width;
uint32_t m_height;
};
#endif
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