I am trying to print an image off the internet in processing.
I have tried looking at the processing website and found some code I thought should work:
import spaceInvadersEnemy.pdf.*;
void setup(){
size(800, 600);
}
void draw(){
size(600, 600);
beginRecord(PDF, "spaceInvadersEnemy.pdf"); // Start writing to PDF
background(255);
stroke(0, 20);
strokeWeight(20);
line(200, 0, 400, height); // Draw line to screen and to PDF
endRecord();
}
But I always got an error on the line with:
import spaceInvadersEnemy.pdf.*;
The error says "No library found for spaceInvadersEnemy.pdf"
I know that I need to include the file somewhere but I don't know where.
I am trying to just simply print an image of a space invaders enemy can someone please help me.
I found the solution by going to the processing website and looking at the load image function it is right here: LoadImage() syntax page
If you have this problem you need to create a PImage then load it with the file name like this: spaceInvadersEnemy = loadImage("spaceInvadersEnemy.png"); you render it by using the image function: image(PImage, xPosition, yPosition, width, height); The width and height are not needed though. Your code should look something like this:
void setup() {
size(800, 600);
spaceInvadersEnemy = loadImage("spaceInvadersEnemy.png");
}
void draw() {
background(0);
image(spaceInvadersEnemy, x, y, 50, 50);
}
Related
I tried to make a simple 3d spinning cube in processing.
int size = 100;
float angle = 0;
void setup() {
size(500, 500, P3D);
}
void draw() {
lights();
translate(width/2, height/2, 0);
rotateY(angle);
rotateX(angle);
background(0);
box(size);
angle+=0.05;
}
When i run it, i got a nice spinning cube but there is some problem in rendering.
Found a similar thread with no answer:-
Processing P3D Animation leaving artifacts behind
Image Depicting the problem
Although I could not found the reason for this weird effect. But here is a quick hack which worked out for me.
Instead of using the background function to fill the background, simply draw a filled rectangle every frame.
int size = 100;
float angle = 0;
void setup() {
size(500, 500, P3D);
}
void draw() {
//black
fill(0);
//rectangle to fill the canvas
rect(0,0,width,height);
lights();
fill(255);
translate(width/2, height/2, 0);
rotateY(angle);
rotateX(angle);
box(size);
angle+=0.05;
}
I'm using Processing to create a learning experience project that allows users to join network components together. I have links using standard lines, but I want to be able to show a signal moving through the line if there is a valid connection. Think of the line as a network cable for example. Is there anyway I can animate this line?
void draw(){
pushStyle();
stroke(0);
line(from.x, from.y, to.x, to.y);
popStyle();
}
} //draw function in the 'link' file
Of course you can, but your question is a little broad. You do have a particular type of animation in mind? Endless possibilities ;)
The basic way to handle something like this in processing is to increase some animation-variables every frame (or use time management - though that is beyond the basics).
Because the animation-variables (for instance position or color) are changed every frame, the animation is different every frame. It's animated.
Below I give an example of a small green line traveling over a black 'connection' line. If you read through the code I think you'll figure it out. This should be incorporated in a nice 'connection' class for ease of use on a larger scale.
//set coordinates for connection-line
int fromX = 100;
int toX = 600;
int fromY = 100;
int toY = 200;
//copy start coordinate for animation
int animx = fromX;
int animy = fromY;
//determine animation stepsize
int stepX = (toX-fromX)/10;
int stepY = (toY-fromY)/10;
void setup() {
size(800, 300);
//set framerate so animation is not to fast
frameRate(5);
//draw thick lines
strokeWeight(10);
}
void draw() {
background(255);
// draw connection in black
stroke(0);
line(fromX, fromY, toX, toY);
//draw animation in green
stroke(0, 255, 0);
line(animx, animy, animx+stepX, animy+stepY);
// step animation for next frame
animx = animx+stepX;
animy = animy+stepY;
// check for reset (if the animation on the next frame is drawn outside the line)
if (animx+stepX > toX)
{
animx = fromX;
}
if (animy+stepY > toY)
{
animy = fromY;
}
}
I'm new to Processing and I'm studying it using the Processing Handbook.
I have this example code :
PImage img;
void setUp() {
size(200, 200);
img = loadImage("selfportrait_small.jpg");
}
void draw() {
background(255);
tint(255, 102);
image(img, 0, 0, 200, 200);
tint(255, 102, 0, 204);
image(img, 40, 40, 200, 200);
}
When I try to run it I get a NullPointerException in the first call to image(). As you can see in the image below, the jpg file is stored in the data folder:
Processing project
Am I missing something? Is there something wrong I'm not able to see?
Thanks for help.
Yes you wrote "setUp" and not "setup" :-)
Since setUp() is never called the image is never loaded.
I am trying to create from a custom shape a mask for an image.
In processing I came up with this:
Image img;
PImage img2;
PGraphics mGraphic;
void setup(){
img = loadImage("mask.jpg");
img2 = loadImage("test.jpg");
mGraphic = createGraphics(1024,1024, JAVA2D);
size(img.width, img.height);
}
void draw(){
background(255);
mGraphic.beginDraw();
mGraphic.background(0);
mGraphic.ellipse(mouseX, mouseY, 400, 400);
mGraphic.endDraw();
img2.mask(mGraphic);
image(img2,0,0);
}
Above code will create a ellipse that will be the mask of the image.
I would like to achieve the same with a custom shape generated by Polygons:
import java.awt.Polygon;
PImage img;
PImage img2;
PGraphics mGraphic;
CustomShape myShape = new CustomShape();
void setup(){
img = loadImage("mask.jpg");
img2 = loadImage("test.jpg");
mGraphic = createGraphics(1024,1024, JAVA2D);
myShape.addPoint(25, 25);
myShape.addPoint(275, 25);
myShape.addPoint(275, 75);
myShape.addPoint(175, 75);
myShape.addPoint(175, 275);
myShape.addPoint(125, 275);
myShape.addPoint(125, 75);
myShape.addPoint(25, 75);
smooth();
// img2.filter(INVERT);
size(img.width, img.height);
}
void draw(){
background(255);
stroke(0);
myShape.display();
img2.mask(myShape);
image(img2,0,0);
}
class CustomShape extends Polygon {
void display() {
stroke(0);
fill(0);
beginShape();
for (int i=0; i<npoints; i++) {
vertex(xpoints[i], ypoints[i]);
}
endShape(CLOSE);
}
}
Unfortunately, this code will give me an error: The method mask(int[]) in the type PImage is not applicable for the arguments (Masking_image_1.CustomShape)
Is this even possible to get the same result as my first code, but then with the use of a custom shape? And how can I solve that?
If there are any questions left, please let me know. Above code will work inside Processing.
Well, your error says it all: the mask() function does not know what to do with a CustomShape parameter. The parameter needs to be a PImage or a mask array. More info can be found in the reference.
To use your custom shape, what you want to do is draw that custom shape to a PGraphics (which is a subclass of PImage), and then use that PGraphics as the mask. You'd do that using the createGraphics() function. Again, more info can be found in the reference.
This produces an OutOfMemory exception after running for a few seconds. Any ideas?
PGraphics img;
void setup() {
size(500, 500);
img = createGraphics(width, height, JAVA2D);
// this is here just for the testcase because else I get a
// NullPointerException too (probably a harmless Processing bug)
img.beginDraw(); img.endDraw();
}
void draw() {
PGraphics tmpImg = createGraphics(img.width, img.height, JAVA2D);
tmpImg.beginDraw();
tmpImg.image(img, 0, 0);
tmpImg.endDraw();
tmpImg.dispose();
}
Mat's right, you're not supposed to instantiate a new PGraphics each frame.
You could simply do something like this:
PGraphics img;
void setup() {
size(500, 500);
img = createGraphics(width, height, JAVA2D);
// this is here just for the testcase because else I get a
// NullPointerException too (probably a harmless Processing bug)
img.beginDraw(); img.endDraw();
}
void draw() {
image(img, 0, 0);
}
because PGraphics extends PImage.
Typically you'd use the basic PImage API, but if you'd need to draw shapes onto a bitmap or fake 'layers', you could use PGraphics in conjunction with PImage, but just don't allocate a new PGraphics 30 to 60 times a second.