Moving image with the cursor - image

Question

So, I'm working on a processing project that lets me use an image as a cursor but I've been having problems with the cursor image because it has been constantly blinking. I read that if the cursor image is too big it has a tendency to constantly blink. However, I was wondering if there was any way that I could keep the size of my image, while still maintaining it as a cursor. OR,
I was wondering if there was a code that lets me press the image and drag it around the screen. :/
Here's the code that I've been using.
// Declaring a variable of type PImage
PImage img;
PImage img2;
void setup() {
size(815,514);
// Make a new instance of a PImage by loading an image file
img = loadImage("preamble.jpg");
img2 = loadImage("blackgun.png");
}
void draw() {
background(0);
// Draw the image to the screen at coordinate (0,0)
image(img,0,0);
//using the image as the cursor
if (mouseX < 50) {
cursor(img2);
} else {
cursor(img2);
}
}

Answer 1

In the reference they say: "it is recommended to make the size 16x16 or 32x32 pixels" about the image to be used as cursor. You can do this by calling resize:
img2 = loadImage("blackgun.png");
img2.resize(32,32);
Also there is no point in the lines:
if (mouseX < 50) {
cursor(img2);
} else {
cursor(img2);
}
As either way you end up with the same img2 as cursor image.
YOu can just use:
image(img, mouseX, mouseY);
but the cursor will be over the image.
That's a simple and poor drag...
I have here an old example of a little better drag and drop, it is using rects() intead of images but the idea is the same and you can easily adapt it to use images:
DragMe[] drags = new DragMe[40];
void setup() {
size(400, 400);
for (int i = 0; i < drags.length; i++) {
drags[i] = new DragMe();
}
}
void draw() {
background(255);
for (int i = 0; i < drags.length; i++) {
drags[i].display();
drags[i].update();
}
}
void mousePressed() {
for (int i = 0; i < drags.length; i++) {
if (!drags[i].isOver())
drags[i].dontMove = true;
drags[i].offset_x = mouseX - drags[i].pos_x;
drags[i].offset_y = mouseY - drags[i].pos_y;
}
}
void mouseReleased() {
for (int i = 0; i < drags.length; i++) {
drags[i].locked = false;
drags[i].dontMove = false;
}
}
class DragMe {
float pos_x, pos_y, SIZE = 20;
float prev_x, prev_y;
boolean locked;
boolean dontMove;
color c = color (0, 170, 170);
float offset_x, offset_y;
DragMe() {
pos_x = random(width-SIZE);
pos_y = random(height-SIZE);
}
void update() {
if (isOver() && !locked && !dontMove || locked && !dontMove )
c = color (170);
else
c = color (0, 170, 170);
if (isClicked()) {
locked = true;
}
if (locked && !dontMove) {
pos_x = mouseX - offset_x;
pos_y = mouseY - offset_y;
}
}
void display() {
fill(c);
rect(pos_x, pos_y, SIZE, SIZE);
}
boolean isOver() {
float right_x = pos_x + SIZE;
float bottom_y = pos_y + SIZE;
return mouseX >= pos_x && mouseX <= right_x &&
mouseY >= pos_y && mouseY <= bottom_y;
}
boolean isClicked() {
return isOver() && mousePressed && !dontMove;
}
}