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#include <stdlib.h>
#include <stdio.h>
#include "raylib.h"
#include "raymath.h"
typedef struct Config {
int SCREEN_WIDTH;
int SCREEN_HEIGHT;
int ORIGIN_X;
int ORIGIN_Y;
char TITLE[20];
int TARGET_FPS;
} Config;
typedef struct Line {
Vector2 start;
Vector2 end;
Color color;
} Line;
typedef struct Object {
float posX;
float posY;
float radius;
Color color;
float charge;
} Object;
typedef struct VectorField {
int colSize;
int rowSize;
int spacing;
Line **lines;
} VectorField;
void Initialize(Config config);
void InitializeVectorField(VectorField *vectorField, int colSize, int rowSize);
void doDrawing(VectorField *vectorField, int colSize, int rowSize, Object *object);
void doUpdate(VectorField *vectorField, Object *object);
int main(void)
{
Config config = {
1500,
900,
1500 / 2,
900 / 2,
"Cool Thing",
60
};
Initialize(config);
int spacing = 20;
int colSize = config.SCREEN_WIDTH / spacing - 1;
int rowSize = config.SCREEN_HEIGHT / spacing - 1;
Line **lines = NULL;
VectorField vectorField = {
.colSize = colSize,
.rowSize = rowSize,
.spacing = spacing,
.lines = lines
};
InitializeVectorField(&vectorField, colSize, rowSize);
Object positiveCharge = {
.posX = 50,
.posY = (float)config.ORIGIN_Y,
.radius = 20,
.color = RED,
.charge = 100
};
while (!WindowShouldClose())
{
doUpdate(&vectorField, &positiveCharge);
doDrawing(&vectorField, colSize, rowSize, &positiveCharge);
}
CloseWindow();
return 0;
}
void Initialize(Config config) {
InitWindow(config.SCREEN_WIDTH, config.SCREEN_HEIGHT, config.TITLE);
SetTargetFPS(config.TARGET_FPS);
}
void MemAllocFailed(char *source) {
printf("Memory allocation for %s failed", source);
exit(42);
}
//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*));
for (int i = 0; i < rowSize; i++) {
vectorField->lines[i] = malloc(colSize * sizeof(Line));
for (int j = 0; j < colSize; j++) {
Vector2 start = {
(float)((j + 1) * vectorField->spacing),
(float)((i + 1) * vectorField->spacing)
};
Vector2 end = {start.x + 5, start.y - 5};
Line line = {
.start = start,
.end = end,
.color = WHITE
};
vectorField->lines[i][j] = line;
}
}
}
void doUpdate(VectorField *vectorField, Object *object) {
float k = 5000.0f;
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 = k * object->charge / Vector2LengthSqr(distanceVector);
float vectorLineMag = Clamp(fieldStrength, 2.0f, 20.0f);
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) {
BeginDrawing();
ClearBackground(BLACK);
for (int i = 0; i < rowSize; i++) {
for (int j = 0; j < colSize; j++) {
DrawLineV(vectorField->lines[i][j].start, vectorField->lines[i][j].end, vectorField->lines[i][j].color);
}
}
DrawCircle(object->posX, object->posY, object->radius, object->color);
EndDrawing();
}
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