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Index › Programming Questions & Help › Syntax Questions › moving a triangle
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moving a triangle (Read 691 times)
goldfish
moving a triangle
Jul 27th, 2009, 3:55am  
hi
i am new in processing but i have done some simple things with flash as2.
i found a tut on processing.org/learning which moves a rectangle from the left to the right. if i want to move a triangle or another complex form - how can i do it? i tried it with a triangle but it morphes the form. i want to move the form. maybe i think wrong. i figure that i need an  instance of a triangle which i can move seperate (somhow like in flash?). can anybody help me?
cheers goldfish

here is the simple script with the rectangle

color c = color(0);
float x = 0;
float y = 100;
float speed = 1;

void setup() {
 size(200,200);
}

void draw() {
 background(255);
 move();
 display();
}

void move() {
 x = x + speed;
 if (x > width) {
   x = 0;
 }
}

void display() {
 fill(c);
 rect(x,y,30,10);
}
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Cedric
Re: moving a triangle
Reply #1 - Jul 27th, 2009, 5:40am  
you can use translate();

to move objects too

Code:

float x = 0;
float y = 100;
float speed = 1;

void setup() {
 size(200,200);
}

void draw() {
 background(255);
 fill(100);
 x = x + speed;
translate( x,0);
triangle(30, 75, 58, 20, 86, 75);
 if (x > width)   x = -40;
}


if you have more objects you have to use push and popMatrix(); though
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goldfish
Re: moving a triangle
Reply #2 - Jul 27th, 2009, 9:39am  
hey thanks for your script. in case of moving the triangle it works perfect. but if i take the example mirror2 from daniel shiffman (to find in examples/video capture/mirror2) and i want to replace the function rect with triangle, then it doesn't work. what can i do in this case?
thanks goldfish
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