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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[50];
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 *objects, int objectNum);
void doUpdate(VectorField *vectorField, Object *objects, int objectNum);
int main(void)
{
Config config = {
1500,
900,
1500 / 2,
900 / 2,
"Force Field Simulator",
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 object0 = {
.posX = (float)config.ORIGIN_X - 200,
.posY = (float)config.ORIGIN_Y - 50,
.radius = 20,
.color = RED,
.charge = 100
};
Object object1 = {
.posX = (float)config.ORIGIN_X + 200,
.posY = (float)config.ORIGIN_Y + 50,
.radius = 20,
.color = BLUE,
.charge = -60
};
// Object object2 = {
// .posX = (float)config.ORIGIN_X + 200,
// .posY = (float)config.ORIGIN_Y - 100,
// .radius = 20,
// .color = BLUE,
// .charge = -100
// };
Object objects[] = {object0, object1};
int objectNum = sizeof(objects) / sizeof(Object);
while (!WindowShouldClose())
{
doUpdate(&vectorField, objects, objectNum);
doDrawing(&vectorField, colSize, rowSize, objects, objectNum);
}
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 *objects, int objectNum) {
float forceConstant = 2000.0f;
float dt = GetFrameTime();
for (int i = 0; i < vectorField->rowSize; i++) {
for (int j = 0; j < vectorField->colSize; j++) {
Vector2 resultant = Vector2Zero();
for (int k = 0; k < objectNum; k++) {
Object object = objects[k];
Vector2 distanceVector = Vector2Subtract(vectorField->lines[i][j].start, (Vector2){object.posX, object.posY});
float fieldStrength = forceConstant * object.charge / Vector2LengthSqr(distanceVector);
Vector2 force = Vector2Normalize(distanceVector);
force = Vector2Scale(force, fieldStrength);
resultant = Vector2Add(force, resultant);
}
float resultantMag = Clamp(Vector2Length(resultant), -20.0f, 20.0f);
if (fabsf(resultantMag) < 2.0f) {
resultantMag = resultantMag >= 0 ? 2.0f : -2.0f;
}
resultant = Vector2Normalize(resultant);
resultant = Vector2Scale(resultant, resultantMag);
vectorField->lines[i][j].end = Vector2Add(vectorField->lines[i][j].start, resultant);
float lineLength = Vector2Length(Vector2Subtract(vectorField->lines[i][j].start, vectorField->lines[i][j].end));
Color color;
if (lineLength >= 16) color = RED;
else if (lineLength >= 12) color = ORANGE;
else if (lineLength >= 8) color = YELLOW;
else if (lineLength >= 4) color = GREEN;
else color = GRAY;
vectorField->lines[i][j].color = color;
}
}
float speed = 20;
objects[0].posX += speed * dt;
objects[1].posX -= speed * dt;
}
void doDrawing(VectorField *vectorField, int colSize, int rowSize, Object *objects, int objectNum) {
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);
}
}
for (int i = 0; i < objectNum; i++) {
Object object = objects[i];
DrawCircle((int)object.posX, (int)object.posY, object.radius, object.color);
}
EndDrawing();
}
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