Comments on: Example 4-3: Varying Variables

By: stani

stani — Sun, 09 Oct 2011 10:29:00 +0000

to vary speed:

// Declare and initialize two integer variables at the top of the code.int circleSize = 0;int circleX = mouseX;int circleY = mouseY;void setup() { size(200,200); smooth();}void draw() { background(0); stroke(255); fill(175); // Use the variables to specify the location of an ellipse. ellipse(pmouseX,pmouseY,circleSize,circleSize); circleSize++; }

By: stani

stani — Sun, 09 Oct 2011 10:29:00 +0000

// Declare and initialize two integer variables at the top of the code.
int circleSize = 0;
int circleX = 100;
int circleY = 100;

void setup() {
size(200,200);
background(0);
smooth();
}

void draw() {
//background(0);
}

void mouseMoved() {
//background(0);
ellipseMode(CENTER);
stroke(255);
fill(175);
// Use the variables to specify the location of an ellipse.
ellipse(circleX,circleY,circleSize,circleSize);
circleSize++;
}

By: stani

stani — Sun, 09 Oct 2011 09:38:00 +0000

here is my code:

// Declare and initialize two integer variables at the top of the code.float circleSize = 0;float circleX = 100;float circleY = 100;//float speed = 0.0;//float offset = 0.0;void setup() { size(200,200); smooth();}void draw() { background(0); stroke(255); fill(175); // Use the variables to specify the location of an ellipse. ellipse(circleX,circleY,circleSize,circleSize); circleSize++; //speed+=offset; }

By: Gabe

Gabe — Sun, 18 Oct 2009 17:42:42 +0000

Thanks. I’m sure I’ll have more questions in the hover chapters…:)

By: admin

admin — Sun, 18 Oct 2009 15:49:24 +0000

In this case, you just want to define a variable for the size of the circle, instead of hardcoding the number 50 in, i.e.

int circleW = 100;
int circleH = 100;

Then you use those variables when drawing the circle.

  ellipse(circleX,circleY,circleW,circleH);

And then adjust the values however you like!

  circleW = circleW + 1;  // Growing
  circleH = circleH - 1;  // Shrinking

By: Gabe

Gabe — Sun, 18 Oct 2009 06:31:37 +0000

so what is the solution to varying the speed at which the circle grows? I wound up using the abs() call as it was in the previous chapter.