P2. JS distance constraint (distanceconstraint) memo

Key code:

1 //here is the code for the ground and the wall2 //under3 varBODY =NewP2. Body ({mass:0, Position: [0, 5]});4 varShape =NewP2. Plane ();5 Body.addshape (shape);6 World.addbody (body);7 8 //Right9BODY =NewP2. Body ({angle:math.pi/2, mass:0, Position: [10, 0]});Ten Body.addshape (shape); One World.addbody (body); A  - //left -BODY =NewP2. Body ({angle:-MATH.PI/2, mass:0, Position: [-10, 0]}); the Body.addshape (shape); - World.addbody (body); -  - //here is the code to constrain the distance of two balls +  varConstraint =NewP2. Distanceconstraint (Circle1, Circle2, { -Distance:3, +Localanchora: [0, 0], ALocalanchorb: [0, 0], at MaxForce:Math.MAX_VALUE - }); - world.addconstraint (constraint); -  -constraint.collideconnected =true; -constraint.lowerlimitenabled =true; inconstraint.upperlimitenabled =true; -Constraint.lowerlimit = 2.5; toConstraint.upperlimit = 4;

Let's first make a memo on the wall code. When the body is initialized, angle is set to MATH.PI/2, which can be seen as rotating the horizontal level counterclockwise (CCW) 90 degrees, and then setting a large x position, forming a right wall. Similarly, when the angle is set to-MATH.PI/2, the horizontal plane rotates 90 degrees clockwise (CW), setting a smaller x position, which is the left wall. Then there are some properties of the distance constraint. Distance, which defines the distance between the Localanchora and Localanchorb two anchor points. Maxforce is the force that the constraint is subjected to. The default value is Math.max_value, at which point you can imagine a hardcore connection between two balls. When the Maxforce is set to a non-maximum value, the equivalent of two balls is connected by a bamboo bar. Collideconnected, if the connected object can collide, the default value is true. This property can be configured with the maxforce above to see the effect together. The Maxforce is set to a smaller value, the binding of the two balls is reduced, by default, the ball may collide, that is, two small balls do not intersect; when collideconnected = False, the two spheres may intersect. Because they are set to not collide. Lowerlimitenabled, uppperlimitenabled, Lowerlimit, Upperlimit, these four properties allow distance constraints to increase the characteristics of similar telescopic pistons. Practice Source Address: https://gist.github.com/yxzblue/3a66babfb93b889f0833#file-distancematerial-html p2.js v0.6.0 package, Link: http ://pan.baidu.com/s/1mgsw7xa Password: Bj85p2.js's github address: https://github.com/schteppe/p2.js

P2. JS distance constraint (distanceconstraint) memo