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使用App Inventor扩展实现多点触控：Rotation Detector 旋转检测 · App Inventor 2 中文网
...ION_MOVE:
Log.i("Rotate","Action Move");
if(ptrID1 != INVALID_POINTER_ID && ptrID2 != INVALID_POINTER_ID){
float nfX, nfY, nsX, nsY;
nsX = event.getX(event.findPointerIndex(ptrID1));
nsY = event.getY(eve...
App Inventor 2 拖拽物体教程 - 按住移动与碰撞检测 · App Inventor 2 中文网
...n 图像精灵1.Dragged(被拖动, 起X, 起Y, 当X, 当Y, 上X, 上Y) {
if 被拖动 {
图像精灵1.X = 图像精灵1.X + (当X - 上X)
图像精灵1.Y = 图像精灵1.Y + (当Y - 上Y)
}
}
注意：Dragged事件的坐标是相对于Canvas的，不是相对于Sprite的。需要计算...
Difference between Ctrl+Shift+F and Ctrl+I in Eclipse
I have been used Ctrl + Shift + F to correct indentation but I heard there is another shortcut to do that: Ctrl + I
4 An...
Remove all but numbers from NSString
...g:@"0123456789"];
while ([scanner isAtEnd] == NO) {
NSString *buffer;
if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {
[strippedString appendString:buffer];
} else {
[scanner setScanLocation:([scanner scanLocation] + 1)];
}
}
NSLog(@"%@", strippedString); // "...
django template display item value or empty string
...
You want the default_if_none template filter, (doc).
default_if_none will display the given string if the variable is 'None'.
default will display the string if the variable evaluates to False, ie empty strings, empty lists etc
{{ item.somefie...
GIT commit as different user without email / or only email
I'm trying to commit some changes as a different user, but i do not have a valid email address, following command is not working for me:
...
How to disable GCC warnings for a few lines of code
...of the diagnostics as of each push, and restore to that point at each pop. If a pop has no matching push, the command-line options are restored." -- from the GCC manual: gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html
– bobpaul
Jan 11 '13 at 18:43
...
ios app maximum memory budget
...want to limit them with a budget. I guess we'll just have to test on many different devices in different settings to find a reasonable maximum memory footprint to use.
– frilla
May 5 '11 at 0:42
...
switch() statement usage
...Well, timing to the rescue again. It seems switch is generally faster than if statements.
So that, and the fact that the code is shorter/neater with a switch statement leans in favor of switch:
# Simplified to only measure the overhead of switch vs if
test1 <- function(type) {
switch(type,
...
How to redirect single url in nginx?
...ss of reorganizing url structure.
I need to setup redirect rules for specific urls - I'm using NGINX.
3 Answers
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