[英]Java5 -XX:MaxHeapFreeRatio=45 doesn't release heap even when more than 45% of the heap is free
[英]Why rotation doesn't work if more than 45 degrees
我正在嘗試在軸上旋轉波浪,但是以某種方式,如果我傳遞到正弦值並將cos值設置為大於45,則波浪似乎會變形或函數無法以適當的角度旋轉。
...
wave
// ROtate
for (int i=0; i<300; i++){
coordinatesX[i] = ((coordinatesX[i] * (float)Math.cos(60)) - (coordinatesY[i] * (float)Math.sin(60))) + coordinatesX[i];
coordinatesY[i] = (coordinatesX[i] * (float)Math.sin(60)) + (coordinatesY[i] * (float)Math.cos(60)) + coordinatesY[i];
}
這是整個代碼:
// define newpath
float[] coordinatesX = new float[300];
float[] coordinatesY = new float[300];
// wave
for (int i=0; i<300; i++){
coordinatesX[i] = i;
coordinatesY[i] = (float)(20 * (Math.sin((-0.10 * coordinatesX[i]))));
System.out.println(coordinatesX[i]);
System.out.println(coordinatesY[i]);
}
// ROtate
for (int i=0; i<300; i++){
coordinatesX[i] = ((coordinatesX[i] * (float)Math.cos(-10)) - (coordinatesY[i] * (float)Math.sin(-10))) + coordinatesX[i];
coordinatesY[i] = (coordinatesX[i] * (float)Math.sin(-10)) + (coordinatesY[i] * (float)Math.cos(-10)) + coordinatesY[i];
}
// Translate
for (int i=0; i < 300; i++) {
coordinatesX[i] = coordinatesX[i]+ (200);
coordinatesY[i] = coordinatesY[i] + (300);
}
您的代碼尚不清楚您到底要做什么,但是您提到了45度
Math.sin()
和Math.cos()
使用弧度http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Math.html
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