commit e14c7e85767810f7b9cac39ccbbf65de797643f1
Author: Sheldon Lee <sheldon.m.lee@gmail.com>
Date:   Fri Jun 12 02:46:44 2020 +0100

    first commit

diff --git a/grid.c b/grid.c
new file mode 100644
index 0000000..ce4542c
--- /dev/null
+++ b/grid.c
@@ -0,0 +1,39 @@
+#include <stdlib.h>
+#include "grid.h"
+
+// maps x, y coordinate to array index of grid
+unsigned int toIndex(Grid* grid, int x, int y)
+{
+	return (grid->width*y + x)%grid->size;
+}
+
+
+void clearGrid(Grid* grid)
+{
+	for (int i = 0; i < grid->size; i++) grid->arr[i]=false;
+}
+
+void initGrid(Grid* grid, unsigned int width, unsigned int height)
+{
+	grid->size = width*height;
+	grid->width = width;
+	grid->arr = (bool*)malloc(sizeof(bool)*grid->size);
+}
+
+void putPixel(Grid* grid, int x, int y)
+{
+	grid->arr[toIndex(grid, x, y)] = true;
+}
+
+void drawGrid(Grid* grid)
+{
+	unsigned int width, height;
+	width = grid->width;
+	height = grid->size/width;
+	for (int y = 0; y < height; y++) {
+		for (int x = 0; x < width; x++) {
+			if (grid->arr[toIndex(grid, x, y)]) mvprintw(y, x, "x");
+			else mvprintw(y, x, " ");
+		}
+	}
+}
diff --git a/grid.h b/grid.h
new file mode 100644
index 0000000..1151ce4
--- /dev/null
+++ b/grid.h
@@ -0,0 +1,17 @@
+#include <stdbool.h>
+#include <ncurses.h>
+
+typedef struct Grid {
+	unsigned int size;
+	unsigned int width;
+	bool* arr;
+} Grid;
+
+void initGrid(Grid* grid, unsigned int width, unsigned int height);
+
+void clearGrid(Grid* grid);
+
+void putPixel(Grid* grid, int x, int y);
+
+void drawGrid(Grid* grid);
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..16598e5
--- /dev/null
+++ b/main.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <ncurses.h>
+#include <unistd.h>
+#include <math.h>
+#include "grid.h"
+#include "vect.h"
+
+void contain(int* pos, int* velocity, int min, int max);
+int main()
+{ 
+	//init 
+	initscr();
+	//noecho();
+	
+	curs_set(FALSE);
+	int width = 0;
+	int height = 0;
+
+	// stdscr created by initscr()
+	getmaxyx(stdscr, height, width);
+
+	Vect2i pos = {0, 0};
+	Vect2i vel = {1, 1};
+
+	const int DELAY = 33*pow(10,3);
+
+	Grid grid;
+	initGrid(&grid, width, height);
+	putPixel(&grid, pos.x, pos.y);
+
+	while (1) {
+		clear();
+
+		clearGrid(&grid);
+		putPixel(&grid, pos.x, pos.y);
+		drawGrid(&grid);
+
+		refresh();
+
+		moveVect2i(&pos, vel.x, vel.y);
+		contain(&pos.x, &vel.x, 0, width-1);
+		contain(&pos.y, &vel.y, 0, height-1);
+
+		usleep(DELAY);
+	}
+
+	endwin();
+	return 0;
+}
+
+void contain(int* pos, int* velocity, int min, int max)
+{
+	bool above_max = max < *pos;
+	bool below_min = *pos < min;
+	bool not_in_range =  below_min || above_max;
+	if (not_in_range) {
+		if (below_min) *pos = min;
+		else if (above_max) *pos = max;
+		*velocity *= -1;
+	}
+}
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..4cffbd8
--- /dev/null
+++ b/makefile
@@ -0,0 +1,4 @@
+LDFLAGS=-lncurses
+
+main: main.c grid.c vect.c
+	gcc main.c grid.c vect.c -o main ${LDFLAGS}
diff --git a/vect.c b/vect.c
new file mode 100644
index 0000000..b2562a7
--- /dev/null
+++ b/vect.c
@@ -0,0 +1,14 @@
+#include "vect.h"
+
+void moveVect2i(Vect2i* vect, int x, int y)
+{
+	vect->x += x;
+	vect->y += y;
+}
+
+
+void moveVect2f(Vect2f* vect, float x, float y)
+{
+	vect->x += x;
+	vect->y += y;
+}
diff --git a/vect.h b/vect.h
new file mode 100644
index 0000000..8c71000
--- /dev/null
+++ b/vect.h
@@ -0,0 +1,11 @@
+typedef struct Vect2i{
+	int x, y;
+} Vect2i;
+
+typedef struct Vect2f{
+	float x, y;
+} Vect2f;
+
+void moveVect2i(Vect2i* vect, int x, int y);
+
+void moveVect2f(Vect2f* vect, float x, float y);