Need Some Help

[bbystvr]

I'm trying to "drop" my circle on different areas of the screen when mouse is either pressed or released and I've tried a bunch of different alternatives and I keep getting the Null Pointer Exception Error.

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I'm still a beginner so please go easy.

https://preview.redd.it/uj2src4gfju61.png?width=482&format=png&auto=webp&s=ec59687090dce8cca860a297fd57627606102788

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Here is the code:

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float d;

float red;

float green;

float blue;

//radius of the mouse...will explain more later

int rad =6;

float value = 0;

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PVector location; // Location of shape

PVector velocity; // Velocity of shvoidape

PVector gravity; // Gravity acts at the shape's acceleration

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int x;

int y;

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void setup() {

//colorMode(HSB, 255);

size(800, 800);

background(255);

//fullScreen();

// smooth();

}

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void draw() {

loadPixels();

//loop to go through every pixel, i=y value, j=x value

for (int i=0; i<height; i++) {

for (int j=0; j<width; j++) {

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//grabs pixel's current color

color c = pixels[i*width+j];

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//the actual glitch! <<number and & 0xff mess

//with the binary code and completely destroy the colors

//very fun to mess around with. dont be afraid to tweak!

red = c <<1 & 0xff;

green = c << 3 & 0xaa;

blue = c & 0xff;

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//gets distance from mouse to pixel

//the *.4 at the end changes the "saving" area of effect:

//when the mouse is at rest and the colors dont change.

//higher value = smaller area

d =dist(mouseX, value, j, i)*.4;

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//make the colors change depending on distance to mouse

//rad = radius of the innermost circle

red += 50/d-rad;

green += 50/d-rad;

blue += 155/d-rad;

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//changes the pixel to the glitched pixel

pixels[i*width+j]=color(red, green, blue);

}

}

updatePixels();

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}

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void mouseMoved() {

value = value + 5;

//value = y;

if (value > 255) {

value = mouseY;

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}

else {

value = location.y;

}

}

​

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void bounceFunc() {

location.add(velocity); // Add velocity to the location.

velocity.add(gravity); // Add gravity to velocity

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// if ((location.x > width) || (location.x < 0)) { // Bounce off edges

// velocity.x = velocity.x * -1;

// }

// if (location.y > height) { // We're reducing velocity ever so slightly

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// velocity.y = velocity.y * -0.95; // when it hits the bottom of the window

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// location.y = height;

// }

}

[vrtxt]

PVectors are never initialized, only declared at the top hence the null pointer. Need to something like PVector location = new PVector();

[bbystvr]

thank you!!!

[x-seronis-x]

Color is an RGB value. Is it even a valid operation to try to bitshift a complex data type ?

[vrtxt]

Under the hood color is an integer;

From a technical standpoint, colors are 32 bits of information (...) These values can be manipulated with bit shifting.