/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.uywKH6IJ3eE/rev.2808
 * 
 * authors: 
 *   Firzen
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 *   Erika Forgione
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 *   Jonny Morrill
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 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 




int FRAME_RATE = 30;
float DT = 1 / float(FRAME_RATE);
float SCALE = 50;

float GRAVITY = 10;

float y = 0;
float vy = 0;

float rectY = 7;
float startingBoxSize = 5;
float boxSize = startingBoxSize;
float compressDist = 1;
float compressionRemaining = 0;

bool falling = true;
bool popped = false;

void setup() {  // this is run once.   
    
    // set the background color
    background(255);
    
    // canvas size (Variable aren't evaluated. Integers only, please.)
    size(300, 500); 
    
    // limit the number of frames per second
    frameRate(FRAME_RATE);
} 

void draw()
{  // this is run repeatedly.

    render();

    // If we are in the box
    if (y + 0.5 > rectY-boxSize && !popped)
    {        
        // Set the box size to what it must be given the ball pos
        boxSize = rectY - (y + 0.5);
        
        // Calculate the box compression
        // 0 when not compressed
        // 1 when fully compressed
        float boxCompression = 1 - (boxSize / startingBoxSize);
        
        // Multiply our speed by 1-compression
        vy -= boxCompression * 50 * DT / startingBoxSize;
        
        // If the box is halfway compressed, pop!
        if (boxSize < startingBoxSize / 2)
        {
           //popped = true;
        }
    }
    else
    {
        vy += GRAVITY * DT;
    }

    y += vy * DT;
}

void render() {
    background(255);
    fill(0, 0, 0);
    ellipse(150, y * SCALE, SCALE, SCALE);
    if(!popped)
    {
        rect(150 - SCALE / 2, rectY * SCALE, SCALE, -boxSize * SCALE);
    }
    
    int textY = 1;
    for(int i = SCALE; i <= 500; i += SCALE) {
        line(0, i, 300, i);
        text("y = " + textY, 15, i); 
        textY++;
    }
}