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Topic: multiply and switch (Read 3416 times) |
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benelek
 
 
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multiply and switch
« on: Feb 20th, 2003, 9:58am » |
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is it possible to run both a noBackground applet and a normal background applet on top of each other?
is it possible to switch between background/noBackground mid-applet?
one or both of these (probably both) could be a way to solve the need to draw everything to the screen on every iteration of the loop... as my programs grow, i've usually got a few different "pallets" open, and only one or a couple of them really need to be refreshed at a time.
even if these concurrent applet layers could only be solid rectangular, it would be a help.
thanks,
-jacob
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REAS
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Re: multiply and switch
« Reply #1 on: Feb 20th, 2003, 7:54pm » |
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you can easily switch between background and noBackground() and back but Processing won't store the buffer information. you need to create a new array of size width*height and explicitly save pixels[] and reload pixels[] each time you switch between the two modes if you want to save the data that is being written into the buffer when noBackground() is set.
here is a relevant but not exact example:
http://www.processing.org/learning/examples/vector_raster.html
i can explain in more detail if you prefer...
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| « Last Edit: Jan 17th, 2004, 8:59pm by REAS » |
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benelek
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Re: multiply and switch
« Reply #2 on: Feb 21st, 2003, 12:48am » |
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mm, this is cool. extremely helpful in programs where im just refreshing a view of something when the mouse is being dragged, etc. i tried the following, which worked well.
Code:
//testing a method of only refreshing when needed.
void setup() {
size(500,300);
background(100);
noBackground();
stroke(0);
objaX=int(random(width));
objbX=int(random(width));
refresh();
}
boolean loopOn=false;
int objaX,objbX;
void loop() {
if(loopOn==true) {
refresh();
}
}
void mousePressed() {
background(100);
loopOn=true;
}
void mouseReleased() {
loopOn=false;
noBackground();
}
void refresh() {
//do ur normal loop stuff here.
int addon=mouseX-pmouseX;
objaX+=addon;
objbX+=addon;
if(objaX>width) {
objaX=0;
} else if(objaX<0) {
objaX=width;
}
if(objbX>width) {
objbX=0;
} else if(objbX<0) {
objbX=width;
}
rect(objaX, height/2+10, 20, 10);
rect(objbX, height/2-10, 20, 10);
}
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one question though...
sometimes when i release the mouse, only part of the background has been redrawn, leaving the rest of the background plain white. are the mousePressed/mouseReleased methods called at the exact moment the mouse button is activated, or do they operate in a fixed sequence before/after loop?
-jacob
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fry
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Re: multiply and switch
« Reply #3 on: Feb 21st, 2003, 1:57am » |
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mouse events are called as soon as they happen, which may be mid-loop.
also, the background is set just before your loop() function begins, so whatever background() or noBackground() setting you had when loop() last finished is what shows up as you start drawing.
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