Android 我想在跟随手指的同时画一条线
基本上，我拍摄屏幕截图并在其上应用裁剪，我使用手指选择裁剪区域以绘制要裁剪的部分。当我向左移动手指时，会出现线条，但我希望线条跟随我的手指创建一个自定义视图，您可以在其上绘制线条。由于此视图似乎应该显示在图像上方，因此最好使用相同的Framelayout将其扩展。并将其放置在图像上方 指线类Android 我想在跟随手指的同时画一条线,android,Android,基本上，我拍摄屏幕截图并在其上应用裁剪，我使用手指选择裁剪区域以绘制要裁剪的部分。当我向左移动手指时，会出现线条，但我希望线条跟随我的手指创建一个自定义视图，您可以在其上绘制线条。由于此视图似乎应该显示在图像上方，因此最好使用相同的Framelayout将其扩展。并将其放置在图像上方 指线类 public boolean onTouchEvent(MotionEvent event) { //Log.e(Codistan_Tag, "Touch Event: " + MotionEve
public boolean onTouchEvent(MotionEvent event) {
//Log.e(Codistan_Tag, "Touch Event: " + MotionEvent.actionToString(event.getAction()));
if(isImageReady) {
if(isSelectionDragEnabled)
mPanListener.onTouchEvent(event);
if (isZoomEnabled) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
anchor_scale = mScaleFactor;
}
mScaleDetector.onTouchEvent(event);
mPanListener.onTouchEvent(event);
}
else {
switch (event.getAction()) {
case MotionEvent.ACTION_POINTER_3_DOWN:
break;
case MotionEvent.ACTION_POINTER_2_DOWN:
break;
case MotionEvent.ACTION_POINTER_1_UP:
break;
case MotionEvent.ACTION_DOWN:
if (isSelectionToolEnabled)
isDrawFinished = false;
orig_x = event.getX();
orig_y = event.getY();
//Log.e(Codistan_Tag, "-------ORIGIN-------s: " + String.valueOf(orig_x) + " " + String.valueOf(orig_y));
orig_x = (orig_x - (dest.left));
orig_y = (orig_y - (dest.top));
if(java.lang.Math.round(mScaleFactor) > 2) {
orig_x += (scale_cur_x * (riz_scale));
orig_y += (scale_cur_y * (riz_scale));
} else {
orig_x += (scale_cur_x);
orig_y += (scale_cur_y);
}
orig_x /= java.lang.Math.round(mScaleFactor);
orig_y /= java.lang.Math.round(mScaleFactor);
orig_x *= scale;
orig_y *= scale;
//mSelectionTaskManager.setOrigin((int) orig_x, (int) orig_y);
if(isSelectionToolEnabled)
MovementStack.add(new Pair((int)orig_x, (int)orig_y));
Log.e(Codistan_Tag, "Codistan Origins: " + String.valueOf(orig_x) + ", " + String.valueOf(orig_y));
break;
case MotionEvent.ACTION_MOVE:
max_dist = dist * scale;
if (event.getAction() != 1) {
move_x = event.getX();
move_y = event.getY();
//Log.e(Codistan_Tag, "Move: " + String.valueOf(move_x) + ", " + String.valueOf(move_y));
move_x = (move_x - dest.left);
move_y = (move_y - dest.top);
if(java.lang.Math.round(mScaleFactor) > 2) {
move_x += (scale_cur_x * riz_scale);
move_y += (scale_cur_y * riz_scale);
} else {
move_x += (scale_cur_x);
move_y += (scale_cur_y);
}
move_x /= java.lang.Math.round(mScaleFactor);
move_y /= java.lang.Math.round(mScaleFactor);
move_x *= scale;
move_y *= scale;
Log.e(Codistan_Tag, "Codistan Move: " + String.valueOf(move_x) + ", " + String.valueOf(move_y));
if (move_x >= 0 && move_y >= 0) {
if (!isSelectionToolEnabled && isDistortionEnabled) {
warpPhotoFromC(image, height, width, max_dist/mScaleFactor, orig_x, orig_y, move_x, move_y);
first++;
distortedBmp.setPixels(image, 0, width, 0, 0, width, height);
fg = false;
} else {
//Cut Tool Enabled
distortedBmp.setPixels(image, 0, width, 0, 0, width, height);
MovementStack.add(new Pair((int) move_x, (int) move_y));
}
}
}
orig_x = move_x;
orig_y = move_y;
break;
case MotionEvent.ACTION_UP:
if (isSelectionToolEnabled)
isDrawFinished = true;
break;
}
}
v.invalidate();
}
return true;
}
注意：不要忘记调用invalidate（），因为它将负责调用onDraw创建一个自定义视图，您可以在其上绘制线条。由于此视图似乎应该显示在图像上方，因此最好使用相同的Framelayout扩展它。并将其放置在图像上方 指线类
public boolean onTouchEvent(MotionEvent event) {
//Log.e(Codistan_Tag, "Touch Event: " + MotionEvent.actionToString(event.getAction()));
if(isImageReady) {
if(isSelectionDragEnabled)
mPanListener.onTouchEvent(event);
if (isZoomEnabled) {
if(event.getAction() == MotionEvent.ACTION_DOWN){
anchor_scale = mScaleFactor;
}
mScaleDetector.onTouchEvent(event);
mPanListener.onTouchEvent(event);
}
else {
switch (event.getAction()) {
case MotionEvent.ACTION_POINTER_3_DOWN:
break;
case MotionEvent.ACTION_POINTER_2_DOWN:
break;
case MotionEvent.ACTION_POINTER_1_UP:
break;
case MotionEvent.ACTION_DOWN:
if (isSelectionToolEnabled)
isDrawFinished = false;
orig_x = event.getX();
orig_y = event.getY();
//Log.e(Codistan_Tag, "-------ORIGIN-------s: " + String.valueOf(orig_x) + " " + String.valueOf(orig_y));
orig_x = (orig_x - (dest.left));
orig_y = (orig_y - (dest.top));
if(java.lang.Math.round(mScaleFactor) > 2) {
orig_x += (scale_cur_x * (riz_scale));
orig_y += (scale_cur_y * (riz_scale));
} else {
orig_x += (scale_cur_x);
orig_y += (scale_cur_y);
}
orig_x /= java.lang.Math.round(mScaleFactor);
orig_y /= java.lang.Math.round(mScaleFactor);
orig_x *= scale;
orig_y *= scale;
//mSelectionTaskManager.setOrigin((int) orig_x, (int) orig_y);
if(isSelectionToolEnabled)
MovementStack.add(new Pair((int)orig_x, (int)orig_y));
Log.e(Codistan_Tag, "Codistan Origins: " + String.valueOf(orig_x) + ", " + String.valueOf(orig_y));
break;
case MotionEvent.ACTION_MOVE:
max_dist = dist * scale;
if (event.getAction() != 1) {
move_x = event.getX();
move_y = event.getY();
//Log.e(Codistan_Tag, "Move: " + String.valueOf(move_x) + ", " + String.valueOf(move_y));
move_x = (move_x - dest.left);
move_y = (move_y - dest.top);
if(java.lang.Math.round(mScaleFactor) > 2) {
move_x += (scale_cur_x * riz_scale);
move_y += (scale_cur_y * riz_scale);
} else {
move_x += (scale_cur_x);
move_y += (scale_cur_y);
}
move_x /= java.lang.Math.round(mScaleFactor);
move_y /= java.lang.Math.round(mScaleFactor);
move_x *= scale;
move_y *= scale;
Log.e(Codistan_Tag, "Codistan Move: " + String.valueOf(move_x) + ", " + String.valueOf(move_y));
if (move_x >= 0 && move_y >= 0) {
if (!isSelectionToolEnabled && isDistortionEnabled) {
warpPhotoFromC(image, height, width, max_dist/mScaleFactor, orig_x, orig_y, move_x, move_y);
first++;
distortedBmp.setPixels(image, 0, width, 0, 0, width, height);
fg = false;
} else {
//Cut Tool Enabled
distortedBmp.setPixels(image, 0, width, 0, 0, width, height);
MovementStack.add(new Pair((int) move_x, (int) move_y));
}
}
}
orig_x = move_x;
orig_y = move_y;
break;
case MotionEvent.ACTION_UP:
if (isSelectionToolEnabled)
isDrawFinished = true;
break;
}
}
v.invalidate();
}
return true;
}
注意：别忘了调用invalidate（），因为它将负责调用onDraw可能的重复no m在屏幕快照上画一条线我看到了这一点但没有帮助可能的重复no m在屏幕快照上画一条线我看到了但没有帮助