public class ImageDisplayView1
extends View
implements View.OnTouchListener
{
public static float MAX_SCALE_RATIO = 5.0F;
public static float MIN_SCALE_RATIO = 0.1F;
float bitmapCenterX;
float bitmapCenterY;
int displayCenterX = 0;
int displayCenterY = 0;
float displayHeight = 0.0F;
float displayWidth = 0.0F;
float distanceThreshold = 3.0F;
boolean isScrolling = false;
int lastX;
int lastY;
Bitmap mBitmap;
Canvas mCanvas;
Context mContext;
Matrix mMatrix;
Paint mPaint;
float oldDistance = 0.0F;
int oldPointerCount = 0;
float scaleRatio;
Bitmap sourceBitmap;
float sourceHeight = 0.0F;
float sourceWidth = 0.0F;
public float startX;
public float startY;
float totalScaleRatio;
public ImageDisplayView1(Context paramContext)
{
super(paramContext);
this.mContext = paramContext;
init();
}
public ImageDisplayView1(Context paramContext, AttributeSet paramAttributeSet)
{
super(paramContext, paramAttributeSet);
this.mContext = paramContext;
init();
}
private void init()
{
this.mPaint = new Paint();
this.mMatrix = new Matrix();
this.lastX = -1;
this.lastY = -1;
setOnTouchListener(this);
}
private void moveImage(float paramFloat1, float paramFloat2)
{
Log.d("test", "moveImage() called : " + paramFloat1 + ", " + paramFloat2);
this.mMatrix.postTranslate(paramFloat1, paramFloat2);
redraw();
}
private void scaleImage(float paramFloat)
{
Log.d("test", "scaleImage() called : " + paramFloat);
this.mMatrix.postScale(paramFloat, paramFloat, this.bitmapCenterX, this.bitmapCenterY);
this.mMatrix.postRotate(0.0F);
this.totalScaleRatio = (paramFloat * this.totalScaleRatio);
redraw();
}
public void drawBackground(Canvas paramCanvas)
{
if (paramCanvas != null) {
paramCanvas.drawColor(-16777216);
}
}
public void newImage(int paramInt1, int paramInt2)
{
Bitmap localBitmap = Bitmap.createBitmap(paramInt1, paramInt2, Bitmap.Config.ARGB_8888);
Canvas localCanvas = new Canvas();
localCanvas.setBitmap(localBitmap);
this.mBitmap = localBitmap;
this.mCanvas = localCanvas;
this.displayWidth = paramInt1;
this.displayHeight = paramInt2;
this.displayCenterX = (paramInt1 / 2);
this.displayCenterY = (paramInt2 / 2);
}
protected void onDraw(Canvas paramCanvas)
{
if (this.mBitmap != null) {
paramCanvas.drawBitmap(this.mBitmap, 0.0F, 0.0F, null);
}
}
protected void onSizeChanged(int paramInt1, int paramInt2, int paramInt3, int paramInt4)
{
if ((paramInt1 > 0) && (paramInt2 > 0))
{
newImage(paramInt1, paramInt2);
redraw();
}
}
public boolean onTouch(View paramView, MotionEvent paramMotionEvent)
{
int i = paramMotionEvent.getAction();
int j = paramMotionEvent.getPointerCount();
switch (i)
{
default:
case 0:
case 2:
float f9;
for (;;)
{
return true;
if (j == 1)
{
float f15 = paramMotionEvent.getX();
float f16 = paramMotionEvent.getY();
this.startX = f15;
this.startY = f16;
}
for (;;)
{
return true;
if (j == 2)
{
this.oldDistance = 0.0F;
this.isScrolling = true;
}
}
if (j == 1)
{
if (this.isScrolling) {
return true;
}
f11 = paramMotionEvent.getX();
f12 = paramMotionEvent.getY();
if (this.startX == 0.0F)
{
this.startX = f11;
this.startY = f12;
return true;
}
f13 = this.startX - f11;
f14 = this.startY - f12;
if (this.oldPointerCount != 2)
{
if (this.totalScaleRatio > 1.0F) {
moveImage(-f13, -f14);
}
this.startX = f11;
this.startY = f12;
}
}
while (j != 2)
{
float f11;
float f12;
float f13;
float f14;
this.oldPointerCount = j;
break;
}
float f3 = paramMotionEvent.getX(0);
float f4 = paramMotionEvent.getY(0);
float f5 = paramMotionEvent.getX(1);
float f6 = paramMotionEvent.getY(1);
float f7 = f3 - f5;
float f8 = f4 - f6;
f9 = FloatMath.sqrt(f7 * f7 + f8 * f8);
if (this.oldDistance != 0.0F) {
break;
}
this.oldDistance = f9;
}
float f10;
if (f9 > this.oldDistance)
{
if (f9 - this.oldDistance < this.distanceThreshold) {
return true;
}
f10 = this.scaleRatio + 0.05F * (this.oldDistance / f9);
label335:
if ((f10 >= MIN_SCALE_RATIO) && (f10 <= MAX_SCALE_RATIO)) {
break label439;
}
Log.d("test", "Invalid scaleRatio : " + f10);
}
for (;;)
{
this.oldDistance = f9;
break;
boolean bool = f9 < this.oldDistance;
f10 = 0.0F;
if (!bool) {
break label335;
}
if (this.oldDistance - f9 < this.distanceThreshold) {
return true;
}
f10 = this.scaleRatio - 0.05F * (f9 / this.oldDistance);
break label335;
label439:
Log.d("test", "Distance : " + f9 + ", ScaleRatio : " + f10);
scaleImage(f10);
}
}
if (j == 1)
{
float f1 = paramMotionEvent.getX();
float f2 = paramMotionEvent.getY();
(this.startX - f1);
(this.startY - f2);
}
for (;;)
{
return true;
this.isScrolling = false;
}
}
public void recycle()
{
if (this.sourceBitmap != null) {
this.sourceBitmap.recycle();
}
}
public void redraw()
{
if (this.sourceBitmap == null) {
return;
}
drawBackground(this.mCanvas);
float f1 = (this.displayWidth - this.sourceBitmap.getWidth()) / 2.0F;
float f2 = (this.displayHeight - this.sourceBitmap.getHeight()) / 2.0F;
this.mCanvas.translate(f1, f2);
this.mCanvas.drawBitmap(this.sourceBitmap, this.mMatrix, this.mPaint);
this.mCanvas.translate(-f1, -f2);
invalidate();
}
public void setImageData(Bitmap paramBitmap)
{
recycle();
this.sourceBitmap = paramBitmap;
this.sourceWidth = this.sourceBitmap.getWidth();
this.sourceHeight = this.sourceBitmap.getHeight();
this.bitmapCenterX = (this.sourceBitmap.getWidth() / 2);
this.bitmapCenterY = (this.sourceBitmap.getHeight() / 2);
this.scaleRatio = 1.0F;
this.totalScaleRatio = 1.0F;
}
}
我在使用f11，f12，f13和f14时遇到错误，无法将其解析为变量。有人可以帮忙吗？此外，还有语法错误吗？
答案 0 :(得分：1)
f11 = paramMotionEvent.getX();
f12 = paramMotionEvent.getY();
你在哪里声明了这些f11和f12 ..
记住声明
while (j != 2)
{
float f11;
float f12;
float f13;
float f14;
this.oldPointerCount = j;
break;
}
将使f11和f12可用＆＃34;仅在循环内＃34; ..也就是说，你在声明它们之前使用你的变量..
答案 1 :(得分：0)
以下是您问题的代码段
this.startX = f11;
this.startY = f12;
}
}
while (j != 2)
{
float f11;
float f12;
正如您所看到的，您在声明它们之前使用它们。此外，您在while循环中声明它们将使其在其他地方无法使用。实际上，它们的声明方式使它们在整个程序中完全无法使用，并且完全没有没有。
在您的计划的最开始
float bitmapCenterX;
float bitmapCenterY;
和其他声明，添加行
float f11;
float f12;
float f13;
float f14;