Using set() and get() without displaying the image

awanegenebayo

Hello,

It may sound like a weird question but it has a logical explanation, trust me .

I'm trying to make a TileMap class for my current project. The only way i found to select a part of the map and display it is using get() and set(). My problem is the following :I only want the selected part of the image to be displayed, not the full map... And i have no idea how to do this.

I don't know if anyone will understant my problem so here is my code, hoping it can help (i'm working on eclipse) :

import processing.core.PApplet;
import processing.core.PImage;

public class TileMap {
    PApplet parent;
    RectLect rectLect;
    int _size;//size in pixels of the image loaded
    int _x, _y;
    PImage _image; //tileMap
    PImage _selection; //To be drawn

    public TileMap(int x, int y, int rectW, int rectH, String image, PApplet p){
        parent = p;
        _image = parent.loadImage(image);
        _size = _image.width;
        rectLect =  new RectLect(0, 0, rectW, rectH, _size);
        _x = x;
        _y = y;
    }

    public void draw(){
        parent.set(0, 0, _image); //Here, this displays the full image on screen, I don't want that !
        _selection = parent.get(rectLect._x, rectLect._y, rectLect._w, rectLect._h);
        parent.set(_x, _y, _selection);//I only want that 
    }

    public void setPosition(int x, int y){
        _x = x;
        _y = y;
    }
}


public class RectLect {
    int _x, _y, _w, _h;
    int _size;//Size of the associated TileMap

    public RectLect(int x, int y, int w, int h, int size){
        _x = x;
        _y = y;
        _w = w;
        _h = h;
        _size = size;
    }

    public void move(int dir, int val){// |0 up ; 1 down ; 2 left ; 3 right| , |number of moves|
        switch(dir){
            case 0 : if(_y >= 0){ _y -=_h*val; } break;
            case 1 : if(_y <= _size){ _y +=_h*val; } break;
            case 2 : if(_x >= 0){ _x -=_w*val; } break;
            case 3 : if(_x <= _size){ _x +=_w*val; } break;
        }
    }

    public void set(int x, int y){
        _x = x;
        _y = y;
    }
}

Thanks for helping !

PhiLho

Your code:

public void draw(){
    parent.set(0, 0, _image); //Here, this displays the full image on screen, I don't want that !
    _selection = parent.get(rectLect._x, rectLect._y, rectLect._w, rectLect._h);
    parent.set(_x, _y, _selection);//I only want that
}

Looks like you solved the problem yourself, so what is your issue? Just remove the first line of draw(), no?

Note that unless I am mistaken, set(x, y, img) looks identical to image(img, x, y)...

awanegenebayo

No, if i remove the first line, the get() apply on what's displayed on screen...

PhiLho

Ah, then replace parent with the reference to the PImage or PGraphics you want to capture. This kind of command, applying to the sketch, often also apply to a PGraphics (they are actually used against the main PGraphics, the one displayed in the sketch).

I missed the "without displaying the image" part, that was only in your subject, not in your question...

awanegenebayo

Yay ! it's working !

Thank you so much!