Processing 2. Креативное программирование

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, .integer float. numbersfloat, , .abs(), ceil(), floor(), round(), sq(), sqrt(), min(), max() dist() println().

int x = 177; int y = -189; float a = 32.75;

float b = -70.38;

float[] numbers = {a, b, x, y};

println("The absolute value of " + a + " is " + abs(a) ); println("The absolute value of " + b + " is " + abs(b) ); println("The absolute value of " + y + " is " + abs(y) );

println("The closest int value greater than (or equal to) " + x + " is " + ceil(x) );

println("The closest int value greater than (or equal to) " + a + " is " + ceil(a) );

println("The closest int value greater than (or equal to) " + b + " is " + ceil(b) );

println("The closest int value less than (or equal to) " + y + " is " + floor(y) );

println("The closest int value less than (or equal to) " + a + " is " + floor(a) );

println("The closest int value less than (or equal to) " + b + " is " + floor(b) );

println("The closest int value to " + a + " is " + round(a) ); println("The closest int value to " + b + " is " + round(b) ); println("The square number of " + x + " is " + sq(x) ); println("The square number of " + b + " is " + sq(b) ); println("The square root of " + x + " is " + sqrt(x) ); println("The square root of " + a + " is " + sqrt(a) ); println("The square root of " + b + " is " + sqrt(b) );

println("The smallest number in the list {" + a + "," + b + "," + x + "," + y + "} is " + min( numbers ) );

println("The largest number in the list {" + a + "," + b + "," + x + "," + y + "} is " + max( numbers ) );

println("The distance between (" + x + ", " + y + ") and (" + a + ", " + b + ") is " + dist(x, y, a, b ) );

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, , Processing 100 x 100 . , Processing,size(). :

. - , :

fabs() .; abs(-189) 189.

fceil() , - . , ceil(177) 177, ceil(-70.38) -70.

ffloor() , . floor(32.75) 32, floor(-70.38) -71.

fround() . round(32.75) 33, round(-70.38) -70.

fmin() .

fmax() .

fsq() . . - .

fsqrt() .. sqrt(-70.38) NaN (Not a Number).

fdist() . - x y , - x y .dist() .

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println() - .. , println(a) -.println() ,. , .

println( x + y );

-12. +println(), .

println( x + " " + y );

177 -189. +println() String.

, . - (GUI). , Apple Macintosh 1980-., ,.

.

draw() ,. draw. setup().

void setup()

{

size( 640, 480 ); smooth(); background( 255 );

}

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void draw()

{

// empty, but we need it to create an app that runs in the continuous mode.

}

void mousePressed()

{

if ( mouseButton == RIGHT ) { background( 255 );

}

}

void mouseMoved()

{

stroke( 0, 64 ); strokeWeight( 1 ); fill( 255, 32 );

float d = dist( mouseX, mouseY, pmouseX, pmouseY ); constrain( d, 8, 100 );

ellipse( mouseX, mouseY, d, d );

}

void mouseDragged()

{

stroke( 0 );

float d = dist( mouseX, mouseY, pmouseX, pmouseY ); constrain( d, 0, 100 );

float w = map( d, 0, 100, 1, 10 ); strokeWeight( w );

line( mouseX, mouseY, pmouseX, pmouseY );

}

void mouseReleased()

{

noStroke(); fill( 255, 16 );

rect( 0, 0, width, height );

}

void mouseClicked()

{

fill( 255, 0, 0, 128 ); float d = random( 20, 200 );

ellipse( mouseX, mouseY, d, d );

}

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, run Cmd + R Mac Ctrl + R Windows Linux. .. ,. , ,. . - :

,:

fmouseClicked() , .. .

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fmouseDragged() ,, ..

fmouseMoved() , ,..

fmousePressed() , .mouseButton.

fmouseReleased() , ..

fmouseX x . .

fmouseY y . .

fpmouseX x . .

fpmouseY y . .

fmousePressed - , - , . ,, .

fmouseButton - ,, .

LEFT, RIGHT CENTER.

- . ,, . Processing ,.. Processing. , D, S -.

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setup() draw().Processing,.

int x; int y; int r; color c;

boolean drawStroke; void setup()

{

size( 480, 320 ); smooth(); strokeWeight( 2 );

x = width/2; y = height/2; r = 80;

c = color( 255, 0, 0 ); drawStroke = true;

}

void draw()

{

background( 255 );

if ( drawStroke == true ) { stroke( 0 );

}else { noStroke();

}

fill( c );

ellipse( x, y, r*2, r*2 );

}

.: keyPressed(), keyReleased() keyTyped().

void keyPressed()

{

if ( key == CODED ) {

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if ( keyCode == RIGHT ) { x += 10;

}else if ( keyCode == LEFT ) {

x-= 10;

}else if ( keyCode == UP ) {

y-= 10;

}else if ( keyCode == DOWN ) {

y+= 10;

}

}

x = constrain( x, r, width-r ); y = constrain( y, r, height-r );

}

void keyReleased()

{

switch ( key ) { case 'r':

c = color( 255, 0, 0 ); break;

case 'g':

c = color( 0, 255, 0 ); break;

case 'b':

c = color( 0, 0, 255 ); break;

case 'c':

c = color( 0, 255, 255 ); break;

case 'm':

c = color( 255, 0, 255 ); break;

case 'y':

c = color( 255, 255, 0 ); break;

default:

break;

}

}

void keyTyped()

{

if ( key == 's' ) { drawStroke = !drawStroke;

}

}

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, :

. S .R, G, B, C, M Y .

Processing , : keyPressed(), keyReleased() keyTyped(). - . keyPressed() , ., .keyReleased() , . ,, .keyTyped() , keyPressed(),, Enter, Ctrl Alt.

fkey .

fkeyCodeShift, Ctrl . ,if, , , ,keyPressed() . keyCode UP,

DOWN, LEFT, RIGHT, ALT, CONTROL, SHIFT, BACKSPACE, TAB, ENTER, RETURN, ESC DELETE.

fkeyPressed ., - ,.draw().

fkeyPressed() .

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fkeyReleased() .

fkeyTyped() , . Alt, Ctrl Shift .

.- ( ,Ctrl + S ),. Processing Wiki ,: http:// wiki.processing.org/w/ Multiple_key_presses.

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