使用指向特定位置的 GPS 值在 Android 中旋转图像
我正在尝试使用类似指南针的东西，传递经度/纬度值以使其指向特定位置，我的代码可以在移动手机（使用 GPS）时绘制箭头来确定位置。
我想使用图像而不是绘图
public void draw(Canvas canvas) {
double angle = calculateAngle(currentLongitude, currentLatitude, targetLongitude, targetLatitude);
//Correction;
angle-=90;
//Correction for azimuth
angle-=azimuth;
if((getContext() instanceof Activity) && ((Activity)getContext()).getWindowManager().getDefaultDisplay().getOrientation()==Configuration.ORIENTATION_PORTRAIT)angle-=90;
while(angle<0)angle=angle+360;
Rect rect = canvas.getClipBounds();
int height = rect.bottom-rect.top;
int width = rect.right-rect.left;
int left = rect.left;
int top = rect.top;
}
I'm trying to use something like a compass, passing it longitude/latitude values to let it point to a specific location, my code can draw an arrow while moving the phone (using GPS) to determine the location.
I want to use an image instead of the drawing thing
public void draw(Canvas canvas) {
double angle = calculateAngle(currentLongitude, currentLatitude, targetLongitude, targetLatitude);
//Correction;
angle-=90;
//Correction for azimuth
angle-=azimuth;
if((getContext() instanceof Activity) && ((Activity)getContext()).getWindowManager().getDefaultDisplay().getOrientation()==Configuration.ORIENTATION_PORTRAIT)angle-=90;
while(angle<0)angle=angle+360;
Rect rect = canvas.getClipBounds();
int height = rect.bottom-rect.top;
int width = rect.right-rect.left;
int left = rect.left;
int top = rect.top;
}
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您需要做两件事：
有一些技巧，在程序启动时预先旋转图像可能比每次绘制时旋转图像更快；但它也需要更多的内存。
You need to do two things:
A few tricks, it might be faster to pre-rotate the image when your program starts up rather than rotating it every time you draw; however it would also take more memory.