1/*******************************************************************************************
2*
3* raylib [shapes] example - easings ball anim
4*
5* This example has been created using raylib 2.5 (www.raylib.com)
6* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
7*
8* Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
9*
10********************************************************************************************/
11
12#include "raylib.h"
13
14#include "easings.h" // Required for easing functions
15
16int main(void)
17{
18 // Initialization
19 //--------------------------------------------------------------------------------------
20 const int screenWidth = 800;
21 const int screenHeight = 450;
22
23 InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings ball anim");
24
25 // Ball variable value to be animated with easings
26 int ballPositionX = -100;
27 int ballRadius = 20;
28 float ballAlpha = 0.0f;
29
30 int state = 0;
31 int framesCounter = 0;
32
33 SetTargetFPS(60); // Set our game to run at 60 frames-per-second
34 //--------------------------------------------------------------------------------------
35
36 // Main game loop
37 while (!WindowShouldClose()) // Detect window close button or ESC key
38 {
39 // Update
40 //----------------------------------------------------------------------------------
41 if (state == 0) // Move ball position X with easing
42 {
43 framesCounter++;
44 ballPositionX = EaseElasticOut(framesCounter, -100, screenWidth/2 + 100, 120);
45
46 if (framesCounter >= 120)
47 {
48 framesCounter = 0;
49 state = 1;
50 }
51 }
52 else if (state == 1) // Increase ball radius with easing
53 {
54 framesCounter++;
55 ballRadius = EaseElasticIn(framesCounter, 20, 500, 200);
56
57 if (framesCounter >= 200)
58 {
59 framesCounter = 0;
60 state = 2;
61 }
62 }
63 else if (state == 2) // Change ball alpha with easing (background color blending)
64 {
65 framesCounter++;
66 ballAlpha = EaseCubicOut(framesCounter, 0.0f, 1.0f, 200);
67
68 if (framesCounter >= 200)
69 {
70 framesCounter = 0;
71 state = 3;
72 }
73 }
74 else if (state == 3) // Reset state to play again
75 {
76 if (IsKeyPressed(KEY_ENTER))
77 {
78 // Reset required variables to play again
79 ballPositionX = -100;
80 ballRadius = 20;
81 ballAlpha = 0.0f;
82 state = 0;
83 }
84 }
85
86 if (IsKeyPressed(KEY_R)) framesCounter = 0;
87 //----------------------------------------------------------------------------------
88
89 // Draw
90 //----------------------------------------------------------------------------------
91 BeginDrawing();
92
93 ClearBackground(RAYWHITE);
94
95 if (state >= 2) DrawRectangle(0, 0, screenWidth, screenHeight, GREEN);
96 DrawCircle(ballPositionX, 200, ballRadius, Fade(RED, 1.0f - ballAlpha));
97
98 if (state == 3) DrawText("PRESS [ENTER] TO PLAY AGAIN!", 240, 200, 20, BLACK);
99
100 EndDrawing();
101 //----------------------------------------------------------------------------------
102 }
103
104 // De-Initialization
105 //--------------------------------------------------------------------------------------
106 CloseWindow(); // Close window and OpenGL context
107 //--------------------------------------------------------------------------------------
108
109 return 0;
110}