int[] lastpoint = new int[2];

void setup () {
size (700,500);
lastpoint[0] = 40;
lastpoint[1] = 300;
}

//-------------------------------------------
/*
void loop() {
 background (204);
  line(pmouseX, pmouseY, mouseX, mouseY); 
}
*/
//-------------------------------------------

void loop() {

}

void mousePressed() { 
 line(lastpoint[0], lastpoint[1], mouseX, mouseY);
 lastpoint[0]=mouseX;
 lastpoint[1]=mouseY;
}