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/*******************************************************************************************
*
* raylib [shapes] example - easings ball anim
*
* 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) 2014-2019 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "easings.h" // Required for easing functions
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
// Ball variable value to be animated with easings
int ballPositionX = -100;
int ballRadius = 20;
float ballAlpha = 0.0f;
int state = 0;
int framesCounter = 0;
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Program Main Entry Point
//----------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings ball anim");
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
UpdateDrawFrame();
}
#endif
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
if (state == 0) // Move ball position X with easing
{
framesCounter++;
ballPositionX = EaseElasticOut(framesCounter, -100, screenWidth/2 + 100, 120);
if (framesCounter >= 120)
{
framesCounter = 0;
state = 1;
}
}
else if (state == 1) // Increase ball radius with easing
{
framesCounter++;
ballRadius = EaseElasticIn(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(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, ballRadius, Fade(RED, 1.0f - ballAlpha));
if (state == 3) DrawText("PRESS [ENTER] TO PLAY AGAIN!", 240, 200, 20, BLACK);
EndDrawing();
//----------------------------------------------------------------------------------
}
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