From fe8dbcd2361ee220cbfa9e4723d717c2059f9554 Mon Sep 17 00:00:00 2001
From: Rosyid Haryadi <rosyid_haryadi@protonmail.com>
Date: Thu, 21 Dec 2023 10:24:41 +0700
Subject: moving charge

---
 src/main.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/main.c b/src/main.c
index 5948ce8..9f7579b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -21,8 +21,8 @@ typedef struct Line {
 } Line;
 
 typedef struct Object {
-    int posX;
-    int posY;
+    float posX;
+    float posY;
     float radius;
     Color color;
     float charge;
@@ -65,11 +65,11 @@ int main(void)
     InitializeVectorField(&vectorField, colSize, rowSize);
 
     Object positiveCharge = {
-            .posX = config.ORIGIN_X,
-            .posY = config.ORIGIN_Y,
+            .posX = 50,
+            .posY = (float)config.ORIGIN_Y,
             .radius = 20,
             .color = RED,
-            .charge = 10
+            .charge = 100
     };
 
     while (!WindowShouldClose())
@@ -93,10 +93,10 @@ void MemAllocFailed(char *source) {
     exit(42);
 }
 
-float getRndAngle() {
-    float nMax = 360;
-    return (float)rand() / ((float)RAND_MAX / nMax); // NOLINT(cert-msc30-c, cert-msc50-cpp)
-}
+//float getRndAngle() {
+//    float nMax = 360;
+//    return (float)rand() / ((float)RAND_MAX / nMax); // NOLINT(cert-msc30-c, cert-msc50-cpp)
+//}
 
 void InitializeVectorField(VectorField *vectorField, int colSize, int rowSize) {
     vectorField->lines = malloc(rowSize * sizeof(Line*));
@@ -120,6 +120,16 @@ void InitializeVectorField(VectorField *vectorField, int colSize, int rowSize) {
 
 void doUpdate(VectorField *vectorField, Object *object) {
     float dt = GetFrameTime();
+    for (int i = 0; i < vectorField->rowSize; i++) {
+        for (int j = 0; j < vectorField->colSize; j++) {
+            Vector2 distanceVector = Vector2Subtract(vectorField->lines[i][j].start, (Vector2){object->posX, object->posY});
+            float fieldStrength = object->charge / Vector2LengthSqr(distanceVector);
+            float vectorLineMag = fmaxf(10.0f, fieldStrength);
+            Vector2 directionVector = Vector2Scale(distanceVector, vectorLineMag / Vector2Length(distanceVector));
+            vectorField->lines[i][j].end = Vector2Add(vectorField->lines[i][j].start, directionVector);
+        }
+    }
+    object->posX += dt * 20;
 }
 
 void doDrawing(VectorField *vectorField, int colSize, int rowSize, Object *object) {
-- 
cgit v1.2.3-70-g09d2