add: tmp commit

5 files changed, 54 insertions, 4 deletions

diff --git a/include/ballistics.h b/include/ballistics.h
index 470c7a6..84a883d 100644
--- a/include/ballistics.h
+++ b/include/ballistics.h
@@ -13,4 +13,9 @@ double calculate_air_density(double temperature,
 							 double pressure,
 							 double relative_humidity);
 
+double retard(DragModel ballistic_model,
+			  double ballistic_coefficient,
+			  double velocity,
+			  double temperature);
+
 #endif
diff --git a/include/context.h b/include/context.h
index a2f651f..65b4585 100644
--- a/include/context.h
+++ b/include/context.h
@@ -16,7 +16,7 @@ typedef enum {
 	BC_G5,
 	BC_G6,
 	BC_G7,
-} BallisticModel;
+} DragModel;
 
 typedef enum {
 	ICAO,
diff --git a/include/drag_model.h b/include/drag_model.h
new file mode 100644
index 0000000..baf5f72
--- /dev/null
+++ b/include/drag_model.h
@@ -0,0 +1,6 @@
+#ifndef DRAG_MODEL_H
+#define DRAG_MODEL_H
+
+
+
+#endif
diff --git a/src/atragmx.c b/src/atragmx.c
index af68b2c..ff684c3 100644
--- a/src/atragmx.c
+++ b/src/atragmx.c
@@ -97,8 +97,7 @@ ATragMXSolution *ATragMXCalcSolution(ATragMXContext *ctx, ace_config *ace) {
 
     if (ace->ballistics->enabled)
         ctx->gun.ballistic_coef
-            = atmospheric_correction(
-									 ctx->gun.ballistic_coef,
+            = atmospheric_correction(ctx->gun.ballistic_coef,
 									 ctx->atmosphere.temperature,
 									 ctx->atmosphere.barometric_pressure,
 									 ctx->atmosphere.relative_humidity,
@@ -129,8 +128,17 @@ ATragMXSolution *ATragMXCalcSolution(ATragMXContext *ctx, ace_config *ace) {
 		// calculate magnitude of bullet.velocity
 		bullet.speed = hypot(bullet.velocity[0],
 							 hypot(bullet.velocity[1], bullet.velocity[2]));
+		memcpy(local_solution.true_velocity,
+			   (double[3]){bullet.velocity[0] - wind1[0],
+						   bullet.velocity[1] - wind1[1],
+						   bullet.velocity[2] - wind1[2]},
+			   sizeof(local_solution.true_velocity));
+		local_solution.true_speed = hypot(local_solution.true_velocity[0],
+										  hypot(local_solution.true_velocity[1],
+												local_solution.true_velocity[2]));
+
+		if (ace->ballistics->enabled)
 
-		
 	}
     
 	return sln;
diff --git a/src/ballistics.c b/src/ballistics.c
index 10d97da..418318a 100644
--- a/src/ballistics.c
+++ b/src/ballistics.c
@@ -4,6 +4,12 @@
 #include "constants.h"
 #include "context.h"
 
+static inline double speed_of_sound(double temperature);
+static inline double calculate_retard(DragModel drag_function,
+									  double ballistic_coefficient,
+									  double velocity,
+									  double mach);
+
 double atmospheric_correction(double ballistic_coefficient,
 							  double temperature,
 							  double pressure,
@@ -36,3 +42,28 @@ double calculate_air_density(double temperature,
 	else
 		return pressure / (SPECIFIC_GAST_CONSTANT_DRY_AIR * temperature);
 }
+
+static inline double speed_of_sound(double temperature) {
+	return sqrt(331.3 * (1.0 + temperature - 273.15 / 273.15));
+}
+
+static inline double
+calculate_retard(DragModel ballistic_model,
+				 double ballistic_coefficient,
+                 double velocity,
+                 double mach)
+{
+	double m = velocity / mach;
+for (int i = 0
+}
+
+double retard(DragModel ballistic_model,
+			  double ballistic_coefficient,
+			  double velocity,
+			  double temperature)
+{
+	return calculate_retard(ballistic_model,
+							ballistic_coefficient,
+							velocity,
+							speed_of_sound(temperature));
+}