Syntax of functions
...
This is how the function is named, its return type and parameters defined with sudo code.
datatype functionName datatype functionName (parameter,.....)
{
<function contents>
<possible return value>
}
Function call
This is how we execute a function:
functionName(parameter,.....) ;
Function Examples
This example shows how to write functions with return values.
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| Code Block |
|---|
void setup()
{
size(300500,300);
smoothstroke(255);
stroke(255,255,255strokeWeight(3);
noFill();
}
void draw()
{
background(0);
bommelsmiley(100,10,140,50height/2);
bommelsmiley(150,10,190,50250,height/2);
bommelsmiley(200,10,240,50400,height/2);
}
void bommelsmiley(int x, int y,int length,int size)
{
strokeWeightprintln(1"smiley");
lineellipse(x,y,100,100); // head
ellipse(x - 20,y+length - 10,10,15); strokeWeight(5);// left eye
ellipse(x + 20,y - 10,10,15); // right eye
ellipsearc(x,y+length,size,size,60,60,radians(20),radians(180-20)); // mouth
} |
And here is our first interactive program:
| Code Block |
|---|
void setup()
{
size(300,300);
background(0);
}
void draw()
{}
void mousePressed()
{
println("x:" + mouseX + ", y:" + mouseY);
} |
Exercise 4
Create Write a program sketch where a unique shape follows the mouse position. When you click the mouse, the shape should change in some way (form, colour, size).