On our site we talk about some of the design and development techniques for various java based applications. We have been growing our various content and slowly developed a steady flow of readers and visitors that help to contribute to the conversation. For many bloggers out there it can be difficult to cut through the clutter and grow your reach and customer by simply posting or developing content. You can do manually submit your content to various RSS feeder sites which is a great way to help grow organically but can take a long time. In order to help multiply your efforts you can also Submit Articles to places like Article Alley which is a free site where you can grab content for free and submit your stories and writings as well.
As people browse through the site and find your articles they will then place your content with links back to your site that will in turn create additional traffic. As you grow your content on your blog by submitting your articles they can then be shared by others. This is very similar to a news story being reported by the Associated Press and then being picked up by thousands of newspapers across the country or world. One simple story with mass appeal can help generate a lot of new readers that may have taken years to develop.

Popularity: 21% [?]

Collision Using Spring Force

When two objects rebound after colliding with each other, it is due to a spring force, even though it may not look like it. When two billiard balls collide, the compression of the ball is limited to a miniscule fraction of its width but it still happens.

Using a spring force requires higher model rates to realistically collide faster, harder objects. The fps display in the demo shows the actual frame rate. The movie itself is set to 999 fps. On a 1.3 GHz P3 it averages about 980 actual fps.

repeat with s = 1 to 4
if s <> me.spritenum then
spOther = sprite(s)

–distance components
distX = (spOther.x) – x
distY = (spOther.y) – y

–pythagorean theorem to get distance
dist = sqrt(power(distX,2) + power(distY,2))

–spring force
xSpring = 0
ySpring = 0
minDist = (sp.width + spOther.width) / 2.0 - 10
if dist < minDist then
springF = (minDist – dist) * .02
xSpring = springF * -(distX/dist)
ySpring = springF * -(distY/dist)
end if

xTotalForce = xTotalForce + xSpring
yTotalForce = yTotalForce + ySpring
end if
end repeat

The algorithm is almost identical to general gravity, so only the repeat loop is shown. Instead of calculating gravity, it calculates spring force. Spring force only acts when the objects are within a certain distance of each other, expressed as dist < minDist.

The magnitude of the spring force is given by minDist – dist. This is the restPosition – position equation from the Spring Forces section. Scaling by .02 puts the force into proportion with other values in the animation. It can be considered the stiffness of the object, the higher it is the stiffer the object.

This demo gives each object a mass, and uses the mass in the
accel = force / mass equation. The behavior of the large object shows how mass affects acceleration. When two objects collide, each experiences the same amount of force, acting in opposite directions. This force translates into a smaller acceleration for more massive objects.

Mass can be set however you’d like. In this demo it is set to the cube of the sprite width, which would roughly correspond to its mass if it was a
3-dimensional sphere.

The type of collision modelled in this demo is for round objects with no friction between them. Friction or non-round shape would cause part of the energy in the collision to go into rotational velocity, making the objects spin.

For comments on the rest of the script, see General Gravity.

Popularity: 90% [?]

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Popularity: 25% [?]