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pong.cpp
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pong.cpp
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#include <stdio.h>
#include <opencv2/video/background_segm.hpp>
#include "opencv2/opencv.hpp"
#include "physics.h"
using namespace cv;
using namespace std;
const char *win = "Flying Pancake";
static bool reverseMirror = true;
void game_over(int, int, Mat *);
int main(int argc, char **argv)
{
if (argc > 2) {
fprintf(stderr, "Error: Please limit arguments to 1 or none.\n");
exit(1);
}
else if (argc == 2) {
if (!strcmp(argv[1], "-r"))
reverseMirror = false;
else {
fprintf(stderr, "Usage: videoBall [-r]\n");
exit(1);
}
}
int cam = 0; // default camera
VideoCapture cap(cam);
if (!cap.isOpened()) {
fprintf(stderr, "Error: Cannot open camera %d\n", cam);
exit(1);
}
namedWindow(win, 3);
Mat fgMaskMOG;
BackgroundSubtractorMOG2 MOG;
Mat inputFrame, outFrame, scoreFrame;
cap >> inputFrame;
int height = inputFrame.rows;
int width = inputFrame.cols;
// initial position
Point pt;
pt.x = RADIUS;
pt.y = height / 4;
// initial momentum
Point momentum;
momentum.x = 0;
momentum.y = 0;
Mat circ;
cvtColor(inputFrame, outFrame, CV_LOAD_IMAGE_COLOR);
cvtColor(inputFrame, scoreFrame, CV_LOAD_IMAGE_COLOR);
cvtColor(inputFrame, circ, CV_BGR2GRAY);
int count = 0;
int sum;
Mat reverseFrame;
Mat ballFrame, handFrame;
Mat foregroundMask, backgroundMask;
Point small;
int score = 0, left = 0, right = 0;
int timer = 50; // 50 frames between points are scored
/*
A score frame is used because drawing text is a VERY expensive operation,
adding two images together is almost 10x faster than using the putText function
SO:
A mask is created with the current score, and it is only updated between
points being scored.
*/
// initialize the scoreFrame here
string text = "First to 5 Points Wins";
int fontFace = FONT_HERSHEY_SCRIPT_SIMPLEX;
int baseline = 0;
double fontScale = 3;
Size textSize = getTextSize(text, fontFace,
fontScale, 8, &baseline);
// center the text
Point textOrg((scoreFrame.cols - textSize.width) / 2,
(scoreFrame.rows + textSize.height) / 2);
scoreFrame = scoreFrame > 256;
putText(scoreFrame, "First to 5 points wins", textOrg, fontFace, fontScale,
Scalar(255,255,255), 1, 8, false);
// Hackish way to Initialize the game
right = -1;
score = -1;
while(++count) {
cap >> inputFrame;
if (reverseMirror) {
inputFrame.copyTo(reverseFrame);
flip(reverseFrame, inputFrame, 1);
}
cvtColor(inputFrame, outFrame, CV_LOAD_IMAGE_COLOR);
MOG(inputFrame, fgMaskMOG);
foregroundMask = fgMaskMOG > THRESH;
backgroundMask = fgMaskMOG <= THRESH;
score = pongDir(&momentum, &pt, height, width);
if (!score) { // still moving
// blank canvas
circ.setTo(Scalar(0, 0, 0));
Rect ballRegion(pt.x - RADIUS, pt.y - RADIUS, 2 * RADIUS, 2 * RADIUS);
ballFrame = circ(ballRegion);
fgMaskMOG.setTo(Scalar(255, 255, 255), foregroundMask); // clean up
fgMaskMOG.setTo(Scalar(0, 0, 0), backgroundMask);
handFrame = fgMaskMOG(ballRegion);
int halfRad = RADIUS / 2;
// top left
small.x = halfRad; small.y = halfRad;
sum = getOverlap(&ballFrame, &handFrame, &small);
momentum.x += pt.x < width / 2 ? sum : 0;
momentum.y += sum;
// top right
small.x = 3 * halfRad; small.y = halfRad;
sum = getOverlap(&ballFrame, &handFrame, &small);
momentum.x += pt.x >= width / 2 ? -sum : 0;
momentum.y += sum;
// bottom left
small.x = halfRad; small.y = 3 * halfRad;
sum = getOverlap(&ballFrame, &handFrame, &small);
momentum.x += pt.x < width / 2 ? sum : 0;
momentum.y -= sum;
// bottom right
small.x = 3 * halfRad; small.y = 3 * halfRad;
sum = getOverlap(&ballFrame, &handFrame, &small);
momentum.x += pt.x >= width / 2 ? -sum : 0;
momentum.y -= sum;
}
else if (!timer--){
// someone scored, so decrement timer and reset when timer = 0
timer = 50;
reset_board(&pt, &momentum, width, height);
if (score > 0) left += 1;
else right += 1;
// Zero out scoreFrame
scoreFrame = scoreFrame > 256;
// put score on the left
putText(scoreFrame, to_string(left), Point(50 - RADIUS, height - 50),
FONT_HERSHEY_SCRIPT_SIMPLEX, 2, Scalar(255, 255, 255), 1, 8, false);
// put right score on right
putText(scoreFrame, to_string(right), Point(width-50,height-50),
FONT_HERSHEY_SCRIPT_SIMPLEX, 2, Scalar(255, 255, 255), 1, 8, false);
//Draw the games dividing line
line(scoreFrame, Point(width / 2, 0), Point(width / 2, height), Scalar(0, 255, 0),
2, 0, 0);
if (right >= 5 || left >= 5) {
// game over, stop playing
game_over(right, left, &fgMaskMOG);
break;
}
}
// outFrame -= Scalar(50,50,50);
// cvtColor(foregroundMask, inputFrame, CV_LOAD_IMAGE_COLOR);
// outFrame.setTo(Scalar(0, 0, 0));
// outFrame.setTo(Scalar(255, 255, 255), foregroundMask);
// set the color of the ball here.
cvtColor(foregroundMask, foregroundMask, COLOR_GRAY2BGR);
addWeighted(outFrame, 0.75, foregroundMask, 0.25, 1, outFrame, -1);
drawCircle(outFrame, pt, RADIUS, Scalar(0, 0, 255));
// Put score frame onto image
addWeighted(outFrame, 0.75, scoreFrame, 1.0, 1, outFrame, -1);
imshow(win, outFrame);
// listening for key press
char c = waitKey(30);
if (c >= 0) {
if (c == 'r') {
reset_board(&pt, &momentum, width, height);
continue;
}
else
break;
}
}
return 0;
}
void game_over(int right, int left, Mat *fgMaskMOG) {
Mat ggFrame;
cvtColor(*fgMaskMOG, ggFrame, COLOR_GRAY2BGR);
ostringstream sysStr;
sysStr << (left > right ? "Left" : "Right") << " Wins!";
string text = String(sysStr.str());
int fontFace = CV_FONT_HERSHEY_DUPLEX;
int baseline = 0;
double fontScale = 3;
Size textSize = getTextSize(text, fontFace,
fontScale, 8, &baseline);
Point textOrg((ggFrame.cols - textSize.width) / 2,
(ggFrame.rows + textSize.height) / 2);
putText(ggFrame, text, textOrg, fontFace, fontScale,
Scalar(0, 0, 255), 1, 8, false);
imshow(win, ggFrame);
waitKey(5000);
exit(0);
}