Adding solar system examples. (#900)

1 files changed, 244 insertions, 0 deletions

diff --git a/examples/models/models_solar_system.c b/examples/models/models_solar_system.c
new file mode 100644
index 00000000..5e2ba72a
--- /dev/null
+++ b/examples/models/models_solar_system.c
@@ -0,0 +1,244 @@
+/*******************************************************************************************
+*
+*   raylib [models] example - full solar system
+*
+*   This example has been created using raylib 2.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2019 Aldrin Martoq (@aldrinmartoq)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "rlgl.h"
+
+#define MAX_BODY_CHILDREN 10
+float rotationSpeed = 0.2;
+
+// A celestial body that has children bodies orbiting around
+typedef struct Body {
+    const char *label;                          // label of the body, for ex: moon
+    float radius;                               // object radius
+    float orbitRadius;                          // orbit average radius
+    float orbitPeriod;                          // time the body takes to do a full orbit loop
+    float rotationPeriod;                       // time the body takes to do a full rotation on itself
+    Texture2D texture;                          // texture of the body
+    Model model;                                // model of the body
+    float orbitPosition;                        // current orbit position
+    float rotationPosition;                     // current rotation position
+    Vector2 labelPosition;                      // label position in screen
+    struct Body *children[MAX_BODY_CHILDREN];   // children array
+    int childrenCount;                          // children count
+} Body;
+
+//------------------------------------------------------------------------------------
+// Module Functions Declaration
+//------------------------------------------------------------------------------------
+Body CreateBody(float radius, float orbitRadius, float orbitPeriod, const char *label, const char *texture); // Initializes a new Body with the given parameters
+void AddBodyChildren(Body *parent, Body *children); // Add a children body to the parent body
+void DrawBody(Body *body, Camera *camera);          // Draw body and its children, updating labelPosition
+void DrawLabels(Body *body);                        // Draw body label and its children labels
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 1024;
+    const int screenHeight = 768;
+    const char *text;
+    bool gridEnabled = true;
+    bool helpEnabled = false;
+    bool labelEnabled = true;
+    bool cameraParametersEnabled = true;
+
+    InitWindow(screenWidth, screenHeight, "raylib [models] example - solar system");
+
+    // Define the camera to look into our 3d world
+    Camera camera = { 0 };
+    camera.position = (Vector3){ 16.0f, 16.0f, 16.0f };
+    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };
+    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
+    camera.fovy = 45.0f;
+    camera.type = CAMERA_PERSPECTIVE;
+
+    SetCameraMode(camera, CAMERA_FREE);
+
+    SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Create Bodies
+    Body sun        = CreateBody(0.2,     0.0,     0, "sun",      "2k_sun");
+    Body moon       = CreateBody(0.05,  0.200,    24, "moon",     "2k_moon");
+    Body mercury    = CreateBody(0.05,  0.396,    90, "mercury",  "2k_mercury");
+    Body venus      = CreateBody(0.05,  0.723,   210, "venus",    "2k_venus_atmosphere");
+    Body earth      = CreateBody(0.05,  1.000,   365, "earth",    "2k_earth_daymap");
+    Body mars       = CreateBody(0.05,  1.523,   690, "mars",     "2k_mars");
+    Body jupiter    = CreateBody(0.05,  5.200,  4260, "jupiter",  "2k_jupiter");
+    Body saturn     = CreateBody(0.05,  9.532, 10620, "saturn",   "2k_saturn");
+    Body uranus     = CreateBody(0.05, 19.180, 30270, "uranus",   "2k_uranus");
+    Body neptune    = CreateBody(0.05, 30.056, 59370, "neptune",  "2k_neptune");
+    Body pluto      = CreateBody(0.05, 39.463, 89310, "pluto",    "2k_eris_fictional");
+
+    AddBodyChildren(&sun, &mercury);
+    // AddBodyChildren(&sun, &venus);
+    AddBodyChildren(&sun, &earth);
+    // AddBodyChildren(&sun, &mars);
+    // AddBodyChildren(&sun, &jupiter);
+    // AddBodyChildren(&sun, &saturn);
+    // AddBodyChildren(&sun, &uranus);
+    // AddBodyChildren(&sun, &neptune);
+    // AddBodyChildren(&sun, &pluto);
+
+    AddBodyChildren(&earth, &moon);
+
+    // Main game loop
+    while (!WindowShouldClose())        // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        UpdateCamera(&camera);
+
+        if (IsKeyPressed(KEY_G)) {
+          gridEnabled = !gridEnabled;
+        }
+
+        if (IsKeyPressed(KEY_H)) {
+            helpEnabled = !helpEnabled;
+        }
+
+        if (IsKeyPressed(KEY_L)) {
+            labelEnabled = !labelEnabled;
+        }
+
+        if (IsKeyPressed(KEY_P)) {
+          cameraParametersEnabled = !cameraParametersEnabled;
+        }
+
+        if (IsKeyPressed(KEY_LEFT)) {
+            rotationSpeed -= 0.1;
+        }
+
+        if (IsKeyPressed(KEY_RIGHT)) {
+            rotationSpeed += 0.1;
+        }
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(BLACK);
+
+            BeginMode3D(camera);
+
+                DrawBody(&sun, &camera);
+
+                // Some reference elements (not affected by previous matrix transformations)
+                if (gridEnabled) {
+                  DrawGrid(80, 1.0f);
+                }
+
+            EndMode3D();
+
+            if (labelEnabled) {
+                DrawLabels(&sun);
+            }
+
+            DrawText("FULL SOLAR SYSTEM", 400, 10, 20, YELLOW);
+            text = FormatText("SPEED: %2.2f", rotationSpeed);
+            DrawText(text, 1024 / 2 - MeasureText(text, 20) / 2, 30, 20, YELLOW);
+
+            if (cameraParametersEnabled) {
+                text = FormatText("Camera\nposition: [%3.3f, %3.3f, %3.3f]\ntarget: [%3.3f, %3.3f, %3.3f]\nup: [%3.3f, %3.3f, %3.3f]",
+                                    camera.position.x, camera.position.y, camera.position.z,
+                                    camera.target.x, camera.target.y, camera.target.z,
+                                    camera.up.x, camera.up.y, camera.up.z);
+                DrawText(text, 10, 50, 20, YELLOW);
+            }
+
+            if (helpEnabled) {
+                DrawText("Keys:\n- [g] toggle grid\n- [h] toggle help\n- [l] toggle labels\n- [p] toggle camera parameters\n- [left/right arrows] increase/decrease speed by 0.1", 200, 200, 20, YELLOW);
+            } else {
+                DrawText("press [h] for help", 1016 - MeasureText("press [h] for help", 20), 740, 20, YELLOW);
+            }
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+
+//--------------------------------------------------------------------------------------------
+// Module Functions Definitions (local)
+//--------------------------------------------------------------------------------------------
+
+// Creates a new body
+Body CreateBody(float radius, float orbitRadius, float orbitPeriod, const char *label, const char *texture_name)
+{
+    Body body;
+    Texture2D texture = LoadTexture(FormatText("resources/solar_system/%s.png", texture_name));
+
+    GenTextureMipmaps(&texture);
+
+    body.label = label;
+    body.radius = radius * 10;
+    body.orbitRadius = orbitRadius * 10;
+    body.orbitPeriod = orbitPeriod;
+    body.model = LoadModel("resources/solar_system/sphere.obj");
+    body.model.materials[0].maps[MAP_DIFFUSE].texture = texture;
+    body.childrenCount = 0;
+    body.orbitPosition = 0.0;
+    return body;
+}
+
+void AddBodyChildren(Body *parent, Body *children) {
+    if (parent->childrenCount >= MAX_BODY_CHILDREN) {
+        TraceLog(LOG_ERROR, "BODY HAS TOO MANY CHILDREN");
+    } else {
+        parent->children[parent->childrenCount] = children;
+        parent->childrenCount++;
+    }
+}
+
+// Draw body and its children
+void DrawBody(Body *body, Camera *camera)
+{
+    DrawModel(body->model, (Vector3) { 0.0f, 0.0f, 0.0f}, body->radius, WHITE);
+
+    body->labelPosition = GetWorldToScreen((Vector3) { body->orbitRadius, body->radius, 0.0 }, *camera);
+
+    for (int i = 0; i < body->childrenCount; i++) {
+        Body *child = body->children[i];
+        child->orbitPosition += rotationSpeed * 360 / child->orbitPeriod;
+        rlPushMatrix();
+            rlRotatef(child->orbitPosition, 0.0, 1.0, 0.0);
+            rlTranslatef(child->orbitRadius, 0.0, 0.0);
+            rlRotatef(-child->orbitPosition, 0.0, 1.0, 0.0);
+
+            DrawBody(child, camera);
+        rlPopMatrix();
+
+        DrawCircle3D((Vector3){ 0.0f, 0.0f, 0.0f }, child->orbitRadius, (Vector3){ 1.0f, 0.0f, 0.0f }, 90.0f, GRAY);
+    }
+}
+
+// Draw body label and its children labels
+void DrawLabels(Body *body)
+{
+    DrawText(body->label, body->labelPosition.x - MeasureText(body->label, 20) / 2, body->labelPosition.y, 20, WHITE);
+
+    for (int i = 0; i < body->childrenCount; i++) {
+        Body *child = body->children[i];
+
+        DrawLabels(child);
+    }
+}