Processing 1.0 - Processing Discourse - Colouring a SVG and drawing to screen

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Index › Programming Questions & Help › Programs › Colouring a SVG and drawing to screen - unknown er

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Colouring a SVG and drawing to screen - unknown er (Read 1018 times)

johnali3ncove

Colouring a SVG and drawing to screen - unknown er
May 17^th, 2010, 4:59pm

Hey,

I have a SVG file which I want to load and change the colour, then redraw to screen. I thought I had it sussed following a recent example but I am getting an error. Can anyone help please?

Code:

PGraphics splatcolored;
PShape splat_shapeA, splat_shapeB, splat_shapeC, splat_shapeD, splat_shapeE;

void setup() {

  size(500,500);
  
  splat_shapeA = loadShape("cursorSplat1_large.svg");
  splat_shapeB = loadShape("cursorSplat2_large.svg");
  splat_shapeC = loadShape("cursorSplat3_large.svg");
  splat_shapeD = loadShape("cursorSplat4_large.svg");
  splat_shapeE = loadShape("cursorSplat5_large.svg");
   
   // SPLAT!
  stroke(-65536,5);
  fill (-65536);
 
  
}

void draw() {
 
 if (mousePressed) {
       splatcolored = createGraphics(325, 324, JAVA2D);
    splatcolored.beginDraw();
     
    // Randomise between the 5 splats
    int ri = int(random(1,6));
    
    if (ri == 1) {
      splat_shapeA.disableStyle();
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeA, 0, 0);
      splatcolored.endDraw();
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
    else if (ri == 2) {
      splat_shapeB.disableStyle();
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeB, 0, 0);
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
    else if (ri == 3) {
      splat_shapeC.disableStyle();
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeC, 0, 0);
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
    else if (ri == 4) { 
      splat_shapeD.disableStyle();   
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeD, 0, 0);
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
    else if (ri == 5) {
      splat_shapeE.disableStyle();
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeE, 0, 0);
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
    else {  
      splat_shapeC.disableStyle();
      splatcolored.fill(-65536);
      splatcolored.stroke(-65536);
      splatcolored.shape(splat_shapeC, 0, 0);
      image(splatcolored, mouseX - (splatcolored.width / 2), mouseY - (splatcolored.height / 2)); 
    }
 }
  
}

Here is the error I get :(

Code:

Exception in thread "Animation Thread" java.lang.NullPointerException
	at java.lang.System.arraycopy(Native Method)
	at sun.awt.image.IntegerInterleavedRaster.setDataElements(IntegerInterleavedRaster.java:412)
	at processing.core.PGraphicsJava2D.updatePixels(Unknown Source)
	at processing.core.PGraphicsJava2D.imageImpl(Unknown Source)
	at processing.core.PGraphics.image(Unknown Source)
	at processing.core.PApplet.image(Unknown Source)
	at coloursvg.draw(coloursvg.java:74)
	at processing.core.PApplet.handleDraw(Unknown Source)
	at processing.core.PApplet.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:619)

PhiLho

Re: Colouring a SVG and drawing to screen - unknown er
Reply #1 - May 18^th, 2010, 2:08am

I wonder why you draw to a secondary graphic buffer instead of using shape directly on the sketch's area. You create lot of buffers with this method...
Anyway, you correctly use endDraw() on the first shape, but you forgot it on the others. You can move it, and the image() call after, at the end of the tests (like you put beginDraw() before the tests).

Cedric YaBB Moderator Offline Posts: 1838	Re: Colouring a SVG and drawing to screen - unknown er Reply #2 - May 18^th, 2010, 2:45am PhiLho wrote on May 18^th, 2010, 2:08am: I wonder why you draw to a secondary graphic buffer instead of using shape directly on the sketch's area. As far as i remember because he wanted to use it as cursor using cursors()
	twitter.com/CedricKiefer

johnali3ncove YaBB Newbies Offline Posts: 12	Re: Colouring a SVG and drawing to screen - unknown er Reply #3 - May 18^th, 2010, 4:38am Thanks again! Works a dream! Yes, that is correct Cedric, thanks again for your help!

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Colouring a SVG and drawing to screen - unknown er Reply #4 - May 18^th, 2010, 4:50am Ah, OK, it doesn't make sense in the given example (which is still nice to show the issue) but perfect sense in the given use case...

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