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- 加盟時間：2017年03月10日
西安尚學堂：android圖片處理代碼
/** 放大縮小
* @param bgimage
* @param newWidth
* @param newHeight
* @return
*/
public Bitmap ZoomImage(Bitmap src, Float newWidth, Float newHeight) {
int width = src.getWidth();
int height = src.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = newWidth / width;
float scaleHeight = newHeight / height;
matrix.postScale(scaleWidth, scaleHeight);
Bitmap bitmap = Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
return bitmap;
}
/** 旋轉圖片返回傳入點旋轉后的位置
* @param 圖片大小/中點/旋轉角度
* @return 旋轉后中點位置
*/
public Vector2D rota(Vector2D bitmapSize, Vector2D midPoint, float angle){
float w = bitmapSize.x;
float h = bitmapSize.y;
angle = (float)Math.toRadians(angle);
Vector vec = new Vector();
//創建矩形的四個頂點
Vector2D point1 = new Vector2D(-midPoint.x,-midPoint.y);
Vector2D point2 = new Vector2D(-midPoint.x + w,-midPoint.y);
Vector2D point3 = new Vector2D(-midPoint.x + w,-midPoint.y + h);
Vector2D point4 = new Vector2D(-midPoint.x,-midPoint.y + h);
//旋轉后頂點位置
point1.setAngle(point1.getAngle()+angle);
point2.setAngle(point2.getAngle()+angle);
point3.setAngle(point3.getAngle()+angle);
point4.setAngle(point4.getAngle()+angle);
//取出左上頂點
vec.addElement(point1);
vec.addElement(point2);
vec.addElement(point3);
vec.addElement(point4);
Vector2D newOrigin = new Vector2D(0,0);
for (int i = 0; i < vec.size(); i++) {
Vector2D tmp = vec.elementAt(i);
if(newOrigin.getX()>tmp.getX()){
newOrigin.setX(tmp.getX());
}
if(newOrigin.getY()>tmp.getY()){
newOrigin.setY(tmp.getY());
｝
}
return newOrigin;
}
//單張圖片旋轉
public Bitmap draw(){
float angle = (float)Math.toDegrees(velocity.getAngle())+90;
Matrix ma = new Matrix();
ma.setRotate(angle);
mid = GameView.img.rota(new Vector2D(imgSrc.getWidth(),imgSrc.getHeight()), new Vector2D(imgSrc.getWidth()/2,imgSrc.getHeight()/2), angle);
return Bitmap.createBitmap(imgSrc,0,0,imgSrc.getWidth(),imgSrc.getHeight(),ma,true);
}
Vector2D 向量類
public class Vector2D {
public float x;
public float y;
//-------------------------------------------------
public Vector2D() {
super();
}
public Vector2D(float x, float y) {
this.x = x;
this.y = y;
}
//-------------------------------------------------
public Vector2D clone() {
return new Vector2D(x, y);
}
//歸零
public Vector2D zero(){
x = 0;
y = 0;
return this;
}
//是否為0
public boolean isZero(){
return x == 0 && y == 0;
}
/** 取出兩點間距離*/
public float getLength(){
return (float)Math.sqrt(getLengthSQ());
}
/** 取出X Y的平方和*/
public float getLengthSQ(){
return x * x + y * y;
}
/** 設置長度*/
public void setLength(float value){
float a = getAngle();
x = (float)Math.cos(a) * value;
y = (float)Math.sin(a) * value;
}
/** 設置角度*/
public void setAngle(float value){
float len = getLength();
x = (float)Math.cos(value) * len;
y = (float)Math.sin(value) * len;
}
public float getAngle(){
return (float)Math.atan2(y, x);
}
/** 規范化*/
public Vector2D normalize(){
if (getLength() == 0) {
x = 1;
return this;
}
float len = getLength();
x /= len;
y /= len;
return this;
}
/** 取最小值*/
public Vector2D truncate(float max){
setLength(Math.min(max,getLength()));
return this;
}
/** 取負值*/
public Vector2D reverse(){
x = - x;
y = - y;
return this;
}
public boolean isNormalized(){
return getLength()==1.0;
}
public float dotProd(Vector2D v2){
return x * v2.getX() + y * v2.getY();
}
public float crossProd(Vector2D v2) {
return x * v2.getY() - y * v2.getX();
}
public static float angleBetween(Vector2D v1, Vector2D v2) {
if (! v1.isNormalized()) {
v1 = v1.clone().normalize();
}
if (! v2.isNormalized()) {
v2 = v2.clone().normalize();
}
return (float)Math.acos(v1.dotProd(v2));
}
public int sign(Vector2D v2) {
return getPerp().dotProd(v2) < 0 ? -1 : 1;
}
public Vector2D getPerp() {
return new Vector2D(-y, x);
}
public float dist(Vector2D v2) {
return (float)Math.sqrt(distSQ(v2));
}
public float distSQ(Vector2D v2) {
float dx = v2.getX() - x;
float dy = v2.getY() - y;
return dx * dx + dy * dy;
}
public Vector2D add(Vector2D v2) {
return new Vector2D(x + v2.getX(), y + v2.getY());
}
public Vector2D subtract(Vector2D v2){
return new Vector2D(x - v2.getX(), y - v2.getY());
}
public Vector2D multiply(float value) {
return new Vector2D(x * value, y * value);
}
/** 分份*/
public Vector2D divide(float value) {
return new Vector2D(x / value, y / value);
}
/** 查看兩點坐標是否相同*/
public boolean equals(Vector2D v2) {
return x == v2.getX() && y == v2.getY();
}
public String toString() {
return "[Vector2D (x:" + x + ", y:" + y + ")]";
}
//-------------------------------------------------
public float getX() {
return x;
}
public void setX(float x) {
this.x = x;
}
public float getY() {
return y;
}
public void setY(float y) {
this.y = y;
}
}