Mask() not available?

Programming Questions

bourdonpr..

in Programming Questions • 19 days ago

I am trying the following code to test mask() using two PGraphics instances. Console displays:

mask() is not available with this renderer

I have no idea why this is not working. Also, if I switch the PGraphics to PImage files and load the images, mask() displays them all wrong - hard edges and lines where they shouldn't be any.

Here is a code example:

PVector location; // Location of shape
PVector velocity; // Velocity of shape
PVector gravity; // Gravity acts at the shape's acceleration
PFont font;
PGraphics ball, pg;
void setup() {
size(400, 400);
smooth();
location = new PVector(100, 100);
velocity = new PVector(1.5, 2.1);
gravity = new PVector(0, 0.2);
font = createFont("ArialMT-48.vlw", 80);
pg = createGraphics(400, 400);
ball = createGraphics(400, 400);
}
void draw() {
background(0);
pg.beginDraw();
pg.smooth();
pg.textFont(font);
pg.fill(255,0,0);
pg.text("TESTING", 30, 150, pg.width, pg.height);
pg.endDraw();
location.add(velocity);
velocity.add(gravity);
if ((location.x > width) || (location.x < 0)) {
velocity.x = velocity.x * -1;
}
if (location.y > height) {
velocity.y = velocity.y * -0.95;
location.y = height;
}
ball.beginDraw();
ball.noStroke();
ball.background(0);
ball.fill(255);
ball.ellipse(location.x, location.y, 100, 100);
ball.endDraw();
ball.filter(GRAY);
ball.mask(pg);
image(pg, 0, 0);
}

Replies(5)

cageehv

Re: Mask() not available?

19 days ago

Hey,

Try a different renderer like OPENGL:

size (400, 400, OPENGL);

Good luck!
Rolf

[ http://cagewebdev.com/index.php/tag/processing/]

GoToLoop

Re: Mask() not available?

18 days ago

Thank you GoToLoop for this little trick that made my previous sketch work.

I don't know though, why it pixelates around the edges. Does anyone have any clue if I can make the quality of the masking better?

I have used it with various shapes and renderers, but when in the mask area it looks pretty rough.

Thanks.

PhiLho

You must use mask() on a PImage, not on a PGraphics. Also you were doing the mask() in the wrong way (you must mask the image with the mask graphics, not the reverse). Minimalistic changes to your sketch:

PVector location; // Location of shape
PVector velocity; // Velocity of shape
PVector gravity; // Gravity acts at the shape's acceleration
PFont font;
PGraphics ball, pg;
void setup() {
size(400, 400);
smooth();
location = new PVector(100, 100);
velocity = new PVector(1.5, 2.1);
gravity = new PVector(0, 0.2);
font = createFont("ArialMT", 80);
pg = createGraphics(400, 400);
ball = createGraphics(400, 400);
}
void draw() {
background(0);
pg.beginDraw();
pg.smooth();
pg.textFont(font);
pg.fill(255,0,0);
pg.text("TESTING", 30, 150, pg.width, pg.height);
pg.endDraw();
location.add(velocity);
velocity.add(gravity);
if ((location.x > width) || (location.x < 0)) {
velocity.x = velocity.x * -1;
}
if (location.y > height) {
velocity.y = velocity.y * -0.95;
location.y = height;
}
ball.beginDraw();
ball.noStroke();
ball.background(0);
ball.fill(255);
ball.ellipse(location.x, location.y, 100, 100);
ball.endDraw();
PImage pi = pg.get();
pi.mask(ball);
image(pi, 0, 0);
}

I also changed the createFont() call. I thought I mentioned that createFont() doesn't work with VLW fonts (use loadFont() for these), and createFont(), with the name of the TTF font on your system, is better to get smooth fonts. This problem can be the source of your "rough" rendering, perhaps. You can also use ball.smooth(), BTW.

bourdonpr..

Re: Mask() not available?

16 days ago

Thanks for the suggestions.

I did try them but I was not satisfied with the results with mask(). I used instead specific masked layers I did in Photoshop and it worked better.

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