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Rotation and mouse placement

[5 Replies]
- 29-Jun-2010 10:08 AM
- Forum: Programming Questions
Hello,

I am new to Processing and I apologize in advance if this is very basic, but I just can't figure it out.

I am trying to make a rectangle rotate according to the mouse location. The thing is that I want it to spin from the center.

In other words, imagine a "T" shape in which the top horizontal bar is fixed, and the vertical bar is spinning relatively.

I am copying where I got to thus far (the bottom bar is spinning from the bottom left corner).

Can anybody give me any ideas as to how to resolve it???

MUCH appreciated!

Roy

___________________

float x;

float y;

float angle1 = 0.0;

float rectaLength = 100;

float rectaWidth = 25;

void setup() {

  size(250, 250);

  smooth();

  fill(0);

}

void draw() {

  background(255);



  float dx = mouseX - x;

  float dy = mouseY - y;

  angle1 = atan2(dy, dx);

  x = mouseX - (cos(angle1) * rectaLength);

  x = mouseX - (cos(angle1) * rectaWidth);

  y = mouseY - (sin(angle1) * rectaLength);

  y = mouseY - (sin(angle1) * rectaWidth);

  recta(113, 187, angle1);

  rect (75, 62, 100, 25);

}

void recta(float x, float y, float a) {

  pushMatrix();

  translate(x, y);

  rotate(a);

  rect(0, 0, rectaLength, rectaWidth);

  popMatrix();

}

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