# Sine Cosine.

Sine Cosine.

Linear movement with sin() and cos(). Numbers between 0 and PI*2 (TWO_PI which angles roughly 6.28) are put into these functions and numbers between -1 and 1 are returned. These values are then scaled to produce larger movements.

```
float x1, x2, y1, y2;
float angle1, angle2;
float scalar = 70;

void setup() {
size(640, 360);
noStroke();
rectMode(CENTER);
}

void draw() {
background(0);

float ang1 = radians(angle1);
float ang2 = radians(angle2);

x1 = width/2 + (scalar * cos(ang1));
x2 = width/2 + (scalar * cos(ang2));

y1 = height/2 + (scalar * sin(ang1));
y2 = height/2 + (scalar * sin(ang2));

fill(255);
rect(width*0.5, height*0.5, 140, 140);

fill(0, 102, 153);
ellipse(x1, height*0.5 - 120, scalar, scalar);
ellipse(x2, height*0.5 + 120, scalar, scalar);

fill(255, 204, 0);
ellipse(width*0.5 - 120, y1, scalar, scalar);
ellipse(width*0.5 + 120, y2, scalar, scalar);

angle1 += 2;
angle2 += 3;

}

```

## Functions Used

fill()

Sets the color used to fill shapes

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size()

Defines the dimension of the display window width and height in units of pixels

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ellipse()

Draws an ellipse (oval) to the screen

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sin()

Calculates the sine of an angle

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rectMode()

Modifies the location from which rectangles are drawn by changing the way in which parameters given to rect() are intepreted

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rect()

Draws a rectangle to the screen

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setup()

The setup() function is run once, when the program starts

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cos()

Calculates the cosine of an angle

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draw()

Called directly after setup(), the draw() function continuously executes the lines of code contained inside its block until the program is stopped or noLoop() is called

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radians()

Converts a degree measurement to its corresponding value in radians

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noStroke()

Disables drawing the stroke (outline)

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background()

The background() function sets the color used for the background of the Processing window

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