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| -rw-r--r-- | force.go | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/force.go b/force.go deleted file mode 100644 index 3bc6d93..0000000 --- a/force.go +++ /dev/null @@ -1,80 +0,0 @@ -// Collection of functions calculating the force inbetween of stars - -package main - -import ( - "math" - "fmt" - "io/ioutil" -) - -// forces_acting calculates the force inbetween the two given stars s1 and s2 -// The function return the force -func force_acting(s1 star, s2 star) force { - - // Gravitational constant - var G float64 = 6.674 * math.Pow(10, -11) - - // Distance between the stars - var r21 float64 = math.Sqrt(math.Pow(s2.c.x - s1.c.x, 2) + math.Pow(s2.c.y - s1.c.y, 2)) - - // Unit vector pointing from s1 to s2 - rhat := force{s2.c.x - s1.c.x, s2.c.y - s1.c.y} - - // Calculate how strong the star is affected - var F_scalar float64 = G * (s1.mass * s2.mass) / math.Pow(math.Abs(r21), 2) - - // Calculate the overall force by combining the scalar and the vector - var Fx float64 = F_scalar * rhat.x - var Fy float64 = F_scalar * rhat.y - - // Pack the forces in a force structur - F := force{Fx, Fy} - - return F -} - -// forces calculates the forces acting in between a given star and all the other stars in a given array. -func forces(stars_arr []star, nr int) { - - // Iterate over all the stars in the stars_arr - for index, _ := range stars_arr { - - // If the current star is not the star itself - if index != nr { - - // generate a new force and add it to the overall force of the star - fa := force_acting(stars_arr[nr], stars_arr[index]) - stars_arr[nr].f.x += fa.x - stars_arr[nr].f.y += fa.y - } - } -} - -// calc_all_forces iterates over all the stars in a given array and calculate the forces acting on all stars -func calc_all_forces(arr []star) { - - // Iterate over all the stars - for index, _ := range arr { - - // Calculate the force acting inbetween the given star and all other stars - // This utilizes go-routines :D - go forces(arr, index) - } -} - -// save_as_csv saves all the information stored in the given array to the given path. -// If no error occures, the return value is nil -func save_as_csv(stars_arr []star, path string) error { - - var filename string = path + ".txt" - var content string - - // Iterate over all the stars in the given array and add the info the the content that will be saved - for _, elem := range stars_arr { - content += fmt.Sprintf("%f,%f,%f,%f,%f\n", elem.c.x, elem.c.y, elem.f.x, elem.f.y, elem.mass) - } - - // Return the error and write the data to disc - return ioutil.WriteFile(filename, []byte(content), 0600) -} |
