here is a code which draw a rectangle wherever you touch , how can we change it in a way that works with two fingers ?
draw two rectangle when you put two fingers in the screen ?
// Define max touch events. My phone (seems to) support 5.
int maxTouchEvents = 5;
// This array will hold all of our queryable MultiTouch data:
MultiTouch[] mt;
//------------------------------
void setup() {
size(400,400);
// Populate our MultiTouch array that will track all of our touch-points:
mt = new MultiTouch[maxTouchEvents];
for(int i=0; i < maxTouchEvents; i++) {
mt[i] = new MultiTouch();
}
}
//------------------------------
void draw() {
background(255);
rect(10,20,20,40);
// If the screen is touched, start querying for MultiTouch events:
if (mousePressed == true) {
// ...for each possible touch event...
for(int i=0; i < maxTouchEvents; i++) {
// If that event been touched...
if(mt[i].touched == true) {
rect(motionX,motionY,10,25);
// Amazing mult-touch graphics implemeneted....
}
}
}
}
//------------------------------
// Override parent class's surfaceTouchEvent() method to enable multi-touch.
// This is what grabs the Android multitouch data, and feeds our MultiTouch
// classes. Only executes on touch change (movement across screen, or initial
// touch).
public boolean surfaceTouchEvent(MotionEvent me) {
// Find number of touch points:
int pointers = me.getPointerCount();
// Set all MultiTouch data to "not touched":
for(int i=0; i < maxTouchEvents; i++) {
mt[i].touched = false;
}
// Update MultiTouch that 'is touched':
for(int i=0; i < maxTouchEvents; i++) {
if(i < pointers) {
mt[i].update(me, i);
}
// Update MultiTouch that 'isn't touched':
else {
mt[i].update();
}
}
// If you want the variables for motionX/motionY, mouseX/mouseY etc.
// to work properly, you'll need to call super.surfaceTouchEvent().
return super.surfaceTouchEvent(me);
}
//------------------------------
// Class to store our multitouch data per touch event.
class MultiTouch {
// Public attrs that can be queried for each touch point:
float motionX, motionY;
float pmotionX, pmotionY;
float size, psize;
int id;
boolean touched = false;
// Executed when this index has been touched:
//void update(MotionEvent me, int index, int newId){
void update(MotionEvent me, int index) {
// me : The passed in MotionEvent being queried
// index : the index of the item being queried
// newId : The id of the pressed item.
// Tried querying these via' the 'historical' methods,
// but couldn't get consistent results.
pmotionX = motionX;
pmotionY = motionY;
psize = size;
motionX = me.getX(index);
motionY = me.getY(index);
size = me.getSize(index);
id = me.getPointerId(index);
touched = true;
}
// Executed if this index hasn't been touched:
void update() {
pmotionX = motionX;
pmotionY = motionY;
psize = size;
touched = false;
}
}
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