2014/10/16 上午 08:16:27

android Programming Glossary: intersection

How do I determine what is touched in 3D space from the screen?

http://stackoverflow.com/questions/2487710/how-do-i-determine-what-is-touched-in-3d-space-from-the-screen

ES 1.1 so you have to do some math by yourself. Ray object intersection is a way to go then. Timmmms answer already covers some of it.. are needed for that. Once you have ray you can use ray intersection test of your choice and of course you need to select closest.. boxes are easy to implement and internet is full of intersection test tutorials for them. This picking tutorial is for DirectX..

Using clipRect - explantion

http://stackoverflow.com/questions/3331805/using-cliprect-explantion

can write to. It sets the clipBounds to be the spacial intersection of the current clipping rectangle and the rectangle specified... replace the clipping rectangle rather than creating the intersection with the previous version. Try moving the clipRect statement..

Upgrade SQLite database from one version to another?

http://stackoverflow.com/questions/3424156/upgrade-sqlite-database-from-one-version-to-another

create new table the newest table creation schema get the intersection with the new columns this time columns taken from the upgraded..

SQLiteOpenHelper onUpgrade() Confusion Android

http://stackoverflow.com/questions/3505900/sqliteopenhelper-onupgrade-confusion-android

create new table the newest table creation schema get the intersection with the new columns this time columns taken from the upgraded..

Logic code reuse between apps for Android and other platforms: To ContentProvider or not to ContentProvider?

http://stackoverflow.com/questions/6636050/logic-code-reuse-between-apps-for-android-and-other-platforms-to-contentprovide

Even your business logic will need classes outside of the intersection of the three class libraries most likely. Hence I wouldn't worry..

How do I determine what is touched in 3D space from the screen?

http://stackoverflow.com/questions/2487710/how-do-i-determine-what-is-touched-in-3d-space-from-the-screen

and vectors a bit. GlUnproject does not exist for OpenGL ES 1.1 so you have to do some math by yourself. Ray object intersection is a way to go then. Timmmms answer already covers some of it but there's more. Idea is to create ray to 3D out of 2D coordinates... of 2D coordinates. Inverse of view matrix and projection matrix are needed for that. Once you have ray you can use ray intersection test of your choice and of course you need to select closest object like at Timmmm's point 4. Bounding spheres and bounding.. object like at Timmmm's point 4. Bounding spheres and bounding boxes are easy to implement and internet is full of intersection test tutorials for them. This picking tutorial is for DirectX but you might get the idea. Ray constructing part is most..

Using clipRect - explantion

http://stackoverflow.com/questions/3331805/using-cliprect-explantion

reduces the region of the screen that future draw operations can write to. It sets the clipBounds to be the spacial intersection of the current clipping rectangle and the rectangle specified. There are lot of variants of the clipRect method that accept.. left top right bottom Region.Op.REPLACE The 5th argument means replace the clipping rectangle rather than creating the intersection with the previous version. Try moving the clipRect statement before the drawRect statement. Or try adding paint.setColor..

Upgrade SQLite database from one version to another?

http://stackoverflow.com/questions/3424156/upgrade-sqlite-database-from-one-version-to-another

table ALTER table TableName RENAME TO 'temp_ TableName create new table the newest table creation schema get the intersection with the new columns this time columns taken from the upgraded table columns.retainAll DBUtils.GetColumns db TableName restore..

SQLiteOpenHelper onUpgrade() Confusion Android

http://stackoverflow.com/questions/3505900/sqliteopenhelper-onupgrade-confusion-android

Logic code reuse between apps for Android and other platforms: To ContentProvider or not to ContentProvider?

http://stackoverflow.com/questions/6636050/logic-code-reuse-between-apps-for-android-and-other-platforms-to-contentprovide

dozen classes with Android mostly in java.io and java.util . Even your business logic will need classes outside of the intersection of the three class libraries most likely. Hence I wouldn't worry one lick about trying to have a common code base. Common..