creating class variables :P

Programming Questions

mr_big

in Programming Questions • 3 years ago

hey everybody :D

I'm a noob in search of some assistance

I have to write a sketch that will do these things -

The sketch draws a three-dimensional cube in the center of the screen.
The cube rotates as the mouse is moved. It should rotate in the same direction as the mouse moves, left-right and up-down.
The cube becomes larger and changes color whenever the user presses a key on the keyboard. A sound effect of your choice (something like a stretching sound) should play whenever the cube gets larger.
The sketch should play some music in a continuous loop the whole time it's running.

Now, I have made a lot of progress on this assignment

I have made a cube, it does rotate, it does change color with every key pressed, it does play a sound effect, and it does play music in a loop.

The only problem is that I don't know how to assign a class variable to the size of the box, and I don't know how to make the box bigger with each key pressed. Could you guys help me out?

Here's the code for reference purposes. Thanks again

import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;
Minim loader;
AudioPlayer player;
//size of the box
float aa = 150;
void setup() {
size (600, 600, P3D);
//audio player
loader = new Minim(this);
player = loader.loadFile("cali.mp3");
player.loop();
}
void draw() {
background(51);
//rotating and placing the cube , map method
translate(width/2, height/2);
//rotate about the x axis
float a = map(-1 * mouseY, 0, (width-1), 0, 2 * PI);
rotateX(a);
//rotate about the y axis
float b = map(-1 * mouseX, 0, (height-1), 0, 2 * PI);
rotateY(b);
//cube size and coloring
box(aa);
if (keyPressed == true){
fill (random (255), random (255), random (255));
//plays the sound effect "bubble pop"
player = loader.loadFile("bubblepop.mp3");
player.play();
box(aa + 34);
}
}
//void mouseClicked() {
//plays the sound effect "bubble pop"
// player = loader.loadFile("bubblepop.mp3");
// player.play();
//}

Replies(2)

hndrsn6

Re: creating class variables :P

3 years ago

if (keyPressed == true){
fill (random (255), random (255), random (255));
//plays the sound effect "bubble pop"
//player = loader.loadFile("bubblepop.mp3");
//player.play();
aa+=5; //add 5 to aa every time a key is pressed
}

That's a very simple way of doing it - you're basically incrementing the size by 5 every time a button is pressed (or held). Is that what you're looking for?

blindfish

Re: creating class variables :P

3 years ago

That seems like a reasonable solution; though I'm not sure what this question has to do with "class variables".

@mr_big: If the assignment specifically asked you to create a class then that's not what you've done. Otherwise your code would appear to address the requirements.

One suggestion though: As hndrsn6 suggests using if(keyPressed) within draw() means it will register for as long as the key is held down. You'd probably be better off using the keyPressed() method outside of draw. This should demonstrate the difference:

int foo = 0;
int bar = 0;
void setup() {
}
void draw() {
if(keyPressed){
bar += 1;
}
println("foo: " + foo);
println("bar: " + bar);
}
void keyPressed() {
foo += 1;
}

As you can see the keyPressed() method will usually only register once when you tap a key, whereas the keyPressed property within draw will register over multiple frames. If you hold a key down though you will run into the key-repeat issue, even with the keyPressed() method. If that becomes a problem you'll have to use a boolean and set it appropriately on keyPressed() and keyReleased().

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