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Topic: draw and loop (Read 258 times) |
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Umberto
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draw and loop
« on: Oct 3rd, 2003, 3:55am » |
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Well, I'm just getting started with processing and I really don't understand how I can do this:
draw something permanent using the loop() function.
I can make circles follow the mouse coordinates, but I canīt draw the circles, they disappear with every new mouse movement.
I tried the draw() function, but can I use draw and loop simultaneosuly?
I have tried to copy examples from reference (like the circles that change size with mouse speed) but when I paste the code and run it the circles are not permanent like they are in the example.
Thanks, I'm really a beginner.
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Bijeoma
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Re: draw and loop
« Reply #1 on: Oct 3rd, 2003, 5:03am » |
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hope this helps. it is just an ellipse that follows the cursor.
void setup()
{
size(300,300);
//centers origin for an ellipse
//default value for origin is the top left corner
ellipseMode(CENTER_RADIUS);
}
void loop()
{
background(0);
ellipse( mouseX, mouseY, 75, 75 );
}
bryan
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JohnG
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Re: draw and loop
« Reply #2 on: Oct 3rd, 2003, 10:35am » |
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I think you need to lose and background(); call in your loop function, that causes the screen to be cleared every frame.
so if your loop function just contains a command to draw the circle, it shuld stay beheind when you move the mouse , and new ones drawn over the top.
E.g. http://www.hardcorepawn.com/circle
the above link also includes a link to the source.
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Bijeoma
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Re: draw and loop
« Reply #3 on: Oct 3rd, 2003, 6:32pm » |
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sorry, misunderstood the question.
bryan
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Umberto Roncoroni
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Re: draw and loop
« Reply #4 on: Oct 9th, 2003, 5:42am » |
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Thanks. I have solved the problem this way: I draw the shape (circle or whatever) into a pixel array and then in the loop i display the array. When I move the mouse and a new circle is drawn, I copy this new circle into the array and display it again in the loop and so on.
It works.
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