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ofxPhysicsEditorBox2D

github.com/hemantasapkota/ofxPhysicsEditorBox2D · @hemantasapkota

OF 0.10 Physics

Load fixtures generated by Physics Editor (https://www.codeandweb.com/physicseditor) in OpenFrameworks

2 0 Last commit 8y ago Created 12y ago

README

ofxPhysicsEditorBox2D

OpenFrameworks addon for loading fixtures generated by Physics Editor(https://www.codeandweb.com/physicseditor).

Features

Attach polygons and circles Debug draw facility of all fixtures

Dependencies

ofxBox2d

Output

The following image shows the Physics Editor file with all the fixtures. The annotated image is concerned with the following:

1 - Shape name: Corresponds to a Box2D Body. May conatain many fixtures. 2 - Anchor Point: This relative position is taken into account while initializing the positions of the bodies. 3 - Fixtures: Polygons and Circles. 4 - PTM Ratio: Pixel-To-Meters ratio. This addon works best with PTM = 30. 5 - Export Format: This addon works with Box2D Generic (PLIST).

Input

The following screenshot was taken from iPAD Mini Retina.

Output

Usage

Init Box2D
box2d.init(); box2d.setGravity(0, 10); box2d.setFPS(60.0);
Create a Body

  b2BodyDef bodydef;
  bodydef.type = b2_staticBody; //could be static, dynamic or kinematic
  gameArea = box2d.getWorld()->CreateBody(&bodydef);

Load fixture file

  NSString file = [[NSString alloc] initWithCString:"images/bgFixture.plist"
                                              encoding:NSUTF8StringEncoding];
  [[GB2ShapeCache sharedShapeCache]
  		            //the file exported by Physics Editor
                  addShapesWithFile:file       
                  
                  //With default anchor point, we need to flip the y-coordinate  
                  screenHeight:ofGetHeight()  
                  
                  //Scale Factor
                  //1 means the normal size as designed on the editor
                  //< 1 means the fixtures are shrunk
                  //> 1 means the fixtures are enlarged
                  scaleFactor:1];             
                                   
                       
  [[GB2ShapeCache sharedShapeCache] 
                  addFixturesToBody:gameArea 
                  forShapeName:@"gameArea"];

Debug Draw Fixtures
void ofApp::draw() { ofPushStyle(); ofSetLineWidth(3); [[GB2ShapeCache sharedShapeCache] drawFixtures]; ofPopStyle(); }

See Example for more details.

To-Do
Debug Draw support for multiple bodies

About

Follow me on twitter: @hemantasapkota and don't forget to star this project.

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