1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/*******************************************************************************************
*
* raylib [physac] example - Forces
*
* This example has been created using raylib 1.5 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "math.h"
#define FORCE_AMOUNT 5.0f
#define FORCE_RADIUS 150
#define LINE_LENGTH 100
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [physac] example - forces");
InitPhysics((Vector2){ 0.0f, -9.81f/2 }); // Initialize physics module
SetTargetFPS(60);
// Global variables
Vector2 mousePosition;
bool isDebug = false;
// Create rectangle physic objects
PhysicObject *rectangles[3];
for (int i = 0; i < 3; i++)
{
rectangles[i] = CreatePhysicObject((Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/3) : (screenHeight/1.5f)) }, 0.0f, (Vector2){ 50, 50 });
rectangles[i]->rigidbody.enabled = true; // Enable physic object rigidbody behaviour
rectangles[i]->rigidbody.friction = 0.1f;
}
// Create circles physic objects
PhysicObject *circles[3];
for (int i = 0; i < 3; i++)
{
circles[i] = CreatePhysicObject((Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/1.5f) : (screenHeight/4)) }, 0.0f, (Vector2){ 0, 0 });
circles[i]->rigidbody.enabled = true; // Enable physic object rigidbody behaviour
circles[i]->rigidbody.friction = 0.1f;
circles[i]->collider.type = COLLIDER_CIRCLE;
circles[i]->collider.radius = 25;
}
// Create walls physic objects
PhysicObject *leftWall = CreatePhysicObject((Vector2){ -25, screenHeight/2 }, 0.0f, (Vector2){ 50, screenHeight });
PhysicObject *rightWall = CreatePhysicObject((Vector2){ screenWidth + 25, screenHeight/2 }, 0.0f, (Vector2){ 50, screenHeight });
PhysicObject *topWall = CreatePhysicObject((Vector2){ screenWidth/2, -25 }, 0.0f, (Vector2){ screenWidth, 50 });
PhysicObject *bottomWall = CreatePhysicObject((Vector2){ screenWidth/2, screenHeight + 25 }, 0.0f, (Vector2){ screenWidth, 50 });
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdatePhysics(); // Update all created physic objects
// Update mouse position value
mousePosition = GetMousePosition();
// Check force input
if (IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) ApplyForceAtPosition(mousePosition, FORCE_AMOUNT, FORCE_RADIUS);
// Check reset input
if (IsKeyPressed('R'))
{
// Reset rectangle physic objects positions
for (int i = 0; i < 3; i++)
{
rectangles[i]->transform.position = (Vector2){ screenWidth/4*(i+1) - rectangles[i]->transform.scale.x/2, (((i % 2) == 0) ? (screenHeight/3) : (screenHeight/1.5f)) - rectangles[i]->transform.scale.y/2 };
rectangles[i]->rigidbody.velocity =(Vector2){ 0.0f, 0.0f };
}
// Reset circles physic objects positions
for (int i = 0; i < 3; i++)
{
circles[i]->transform.position = (Vector2){ screenWidth/4*(i+1), (((i % 2) == 0) ? (screenHeight/1.5f) : (screenHeight/4)) };
circles[i]->rigidbody.velocity =(Vector2){ 0.0f, 0.0f };
}
}
// Check debug switch input
if (IsKeyPressed('P')) isDebug = !isDebug;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
// Draw rectangles
for (int i = 0; i < 3; i++)
{
// Convert transform values to rectangle data type variable
DrawRectangleRec(TransformToRectangle(rectangles[i]->transform), RED);
if (isDebug) DrawRectangleLines(rectangles[i]->collider.bounds.x, rectangles[i]->collider.bounds.y, rectangles[i]->collider.bounds.width, rectangles[i]->collider.bounds.height, GREEN);
// Draw force radius
DrawCircleLines(mousePosition.x, mousePosition.y, FORCE_RADIUS, BLACK);
// Draw direction line
if (CheckCollisionPointCircle((Vector2){ rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 }, mousePosition, FORCE_RADIUS))
{
Vector2 direction = { rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2 - mousePosition.x, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 - mousePosition.y };
float angle = atan2l(direction.y, direction.x);
DrawLineV((Vector2){ rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2, rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 },
(Vector2){ rectangles[i]->transform.position.x + rectangles[i]->transform.scale.x/2 + (cos(angle)*LINE_LENGTH), rectangles[i]->transform.position.y + rectangles[i]->transform.scale.y/2 + (sin(angle)*LINE_LENGTH) }, BLACK);
}
}
// Draw circles
for (int i = 0; i < 3; i++)
{
DrawCircleV(circles[i]->transform.position, circles[i]->collider.radius, BLUE);
if (isDebug) DrawCircleLines(circles[i]->transform.position.x, circles[i]->transform.position.y, circles[i]->collider.radius, GREEN);
// Draw force radius
DrawCircleLines(mousePosition.x, mousePosition.y, FORCE_RADIUS, BLACK);
// Draw direction line
if (CheckCollisionPointCircle((Vector2){ circles[i]->transform.position.x, circles[i]->transform.position.y }, mousePosition, FORCE_RADIUS))
{
Vector2 direction = { circles[i]->transform.position.x - mousePosition.x, circles[i]->transform.position.y - mousePosition.y };
float angle = atan2l(direction.y, direction.x);
DrawLineV((Vector2){ circles[i]->transform.position.x, circles[i]->transform.position.y },
(Vector2){ circles[i]->transform.position.x + (cos(angle)*LINE_LENGTH), circles[i]->transform.position.y + (sin(angle)*LINE_LENGTH) }, BLACK);
}
}
// Draw help messages
DrawText("Use LEFT MOUSE BUTTON to apply a force", screenWidth/2 - MeasureText("Use LEFT MOUSE BUTTON to apply a force", 20)/2, screenHeight*0.075f, 20, LIGHTGRAY);
DrawText("Use R to reset objects position", screenWidth/2 - MeasureText("Use R to reset objects position", 20)/2, screenHeight*0.875f, 20, GRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
ClosePhysics(); // Unitialize physics module
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
|
