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
|
/*******************************************************************************************
*
* raylib [shapes] example - easings ball anim
*
* Example originally created with raylib 2.5, last time updated with raylib 2.5
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2014-2024 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "reasings.h" // Required for easing functions
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings ball anim");
// Ball variable value to be animated with easings
int ballPositionX = -100;
int ballRadius = 20;
float ballAlpha = 0.0f;
int state = 0;
int framesCounter = 0;
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
if (state == 0) // Move ball position X with easing
{
framesCounter++;
ballPositionX = (int)EaseElasticOut((float)framesCounter, -100, screenWidth/2.0f + 100, 120);
if (framesCounter >= 120)
{
framesCounter = 0;
state = 1;
}
}
else if (state == 1) // Increase ball radius with easing
{
framesCounter++;
ballRadius = (int)EaseElasticIn((float)framesCounter, 20, 500, 200);
if (framesCounter >= 200)
{
framesCounter = 0;
state = 2;
}
}
else if (state == 2) // Change ball alpha with easing (background color blending)
{
framesCounter++;
ballAlpha = EaseCubicOut((float)framesCounter, 0.0f, 1.0f, 200);
if (framesCounter >= 200)
{
framesCounter = 0;
state = 3;
}
}
else if (state == 3) // Reset state to play again
{
if (IsKeyPressed(KEY_ENTER))
{
// Reset required variables to play again
ballPositionX = -100;
ballRadius = 20;
ballAlpha = 0.0f;
state = 0;
}
}
if (IsKeyPressed(KEY_R)) framesCounter = 0;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
if (state >= 2) DrawRectangle(0, 0, screenWidth, screenHeight, GREEN);
DrawCircle(ballPositionX, 200, (float)ballRadius, Fade(RED, 1.0f - ballAlpha));
if (state == 3) DrawText("PRESS [ENTER] TO PLAY AGAIN!", 240, 200, 20, BLACK);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
|
