にやり直し、私は、ユーザーが四角形などの図形を描くことが可能なアプリを、描画開発していますが、サークルなどのユーザーは、(ペン)を描くフリーハンドを作ることができます。元に戻すと、キャンバス
アンドゥ、リドゥ機能を追加したいと思います。私は、元に戻すとやり直しのためにSOの答えのほとんどを検索して読みましたが、すべてがパスに関連しています。 2つのリストを管理していることを意味し、1つはパスの描画リスト用、もう1つはパスのアンドゥリスト用です。それは良い方法ですが、その自由な手描きの場合、または私がパスを使って作業する場合にのみ動作します。ここで
私は、異なる形状のためのキャンバス方法の種類を呼び出しています。
ヘルプ私は、キャンバスの描画にアンドゥリドゥを提供します。
は、ここに私のコード
public class DrawingView extends android.support.v7.widget.AppCompatImageView {
public static final int RECTANGLE = 1;
public static final int SQUARE = 2;
public static final int CIRCLE = 3;
public
static final int LINE = 4;
public static final int SMOOTH_LINE = 5;
public static final int TRIANGLE = 6;
public static final int IMPORT_IMAGE = 7;
public static final int ERASER = 8;
private static final float TOUCH_TOLERANCE = 5;
private int color;
private int currentShape;
protected Paint mPaint;
protected Bitmap mBitmap;
protected Canvas mCanvas;
private float mx, my;
private float mStartX, mStartY;
private int width, height;
private boolean isDrawing = true;
public static int TOUCH_STROKE_WIDTH = 3;
public static int ERASER_WIDTH = 3;
private Path mPath = new Path();
int countTouch = 0;
float basexTriangle = 0;
float baseyTriangle = 0;
public DrawingView(Context context, int shape, int color) {
super(context);
initPaint();
}
protected void initPaint() {
color = DrawingActivity.selectedColor;
currentShape = DrawingActivity.currentShape;
mPaint = new Paint(Paint.DITHER_FLAG);
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(color);
if (DrawingActivity.isFill && !DrawingActivity.isEraser && currentShape != SMOOTH_LINE) {
mPaint.setStyle(Paint.Style.FILL);
} else {
mPaint.setStyle(Paint.Style.STROKE);
}
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
if (DrawingActivity.isEraser) {
mPaint.setStrokeWidth(ERASER_WIDTH);
} else {
mPaint.setStrokeWidth(TOUCH_STROKE_WIDTH);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//Retrieve the point
mx = event.getX();
my = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
initPaint();
break;
}
switch (currentShape) {
case RECTANGLE:
onTouchEventRectangle(event);
break;
case SQUARE:
onTouchEventSquare(event);
break;
case CIRCLE:
onTouchEventCircle(event);
break;
case LINE:
onTouchEventLine(event);
break;
case SMOOTH_LINE:
onTouchEventSmoothLine(event);
break;
case TRIANGLE:
onTouchEventTriangle(event);
break;
}
return true;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mBitmap, 0, 0, mPaint);
if (isDrawing) {
switch (currentShape) {
case RECTANGLE:
onDrawRectangle(canvas);
break;
case SQUARE:
onDrawSquare(canvas);
break;
case CIRCLE:
onDrawCircle(canvas);
break;
case LINE:
onDrawLine(canvas);
break;
case SMOOTH_LINE:
onDrawLine(canvas);
break;
case TRIANGLE:
onDrawTriangle(canvas);
break;
}
}
//draw your element
}
private void onTouchEventRectangle(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrawing = true;
mStartX = mx;
mStartY = my;
invalidate();
break;
case MotionEvent.ACTION_MOVE:
invalidate();
break;
case MotionEvent.ACTION_UP:
isDrawing = false;
drawRectangle(mCanvas, mPaint);
invalidate();
break;
}
}
private void onDrawRectangle(Canvas canvas) {
drawRectangle(canvas, mPaint);
}
private void drawRectangle(Canvas canvas, Paint paint) {
float right = mStartX > mx ? mStartX : mx;
float left = mStartX > mx ? mx : mStartX;
float bottom = mStartY > my ? mStartY : my;
float top = mStartY > my ? my : mStartY;
canvas.drawRect(left, top, right, bottom, paint);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = w;
height = h;
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_4444);
mCanvas = new Canvas(mBitmap);
}
private void onDrawSquare(Canvas canvas) {
onDrawRectangle(canvas);
}
private void onTouchEventSquare(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrawing = true;
mStartX = mx;
mStartY = my;
invalidate();
break;
case MotionEvent.ACTION_MOVE:
adjustSquare(mx, my);
invalidate();
break;
case MotionEvent.ACTION_UP:
isDrawing = false;
adjustSquare(mx, my);
drawRectangle(mCanvas, mPaint);
invalidate();
break;
}
}
/**
* Adjusts current coordinates to build a square
*
* @param x
* @param y
*/
protected void adjustSquare(float x, float y) {
float deltaX = Math.abs(mStartX - x);
float deltaY = Math.abs(mStartY - y);
float max = Math.max(deltaX, deltaY);
mx = mStartX - x < 0 ? mStartX + max : mStartX - max;
my = mStartY - y < 0 ? mStartY + max : mStartY - max;
}
private void onDrawCircle(Canvas canvas) {
canvas.drawCircle(mStartX, mStartY, calculateRadius(mStartX, mStartY, mx, my), mPaint);
}
private void onTouchEventCircle(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrawing = true;
mStartX = mx;
mStartY = my;
invalidate();
break;
case MotionEvent.ACTION_MOVE:
invalidate();
break;
case MotionEvent.ACTION_UP:
isDrawing = false;
mCanvas.drawCircle(mStartX, mStartY,
calculateRadius(mStartX, mStartY, mx, my), mPaint);
invalidate();
break;
}
}
/**
* @return
*/
protected float calculateRadius(float x1, float y1, float x2, float y2) {
return (float) Math.sqrt(
Math.pow(x1 - x2, 2) +
Math.pow(y1 - y2, 2)
);
}
private void onDrawLine(Canvas canvas) {
float dx = Math.abs(mx - mStartX);
float dy = Math.abs(my - mStartY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
canvas.drawLine(mStartX, mStartY, mx, my, mPaint);
}
}
private void onTouchEventLine(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrawing = true;
mStartX = mx;
mStartY = my;
invalidate();
break;
case MotionEvent.ACTION_MOVE:
invalidate();
break;
case MotionEvent.ACTION_UP:
isDrawing = false;
mCanvas.drawLine(mStartX, mStartY, mx, my, mPaint);
invalidate();
break;
}
}
private void onTouchEventSmoothLine(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isDrawing = true;
mStartX = mx;
mStartY = my;
mPath.reset();
mPath.moveTo(mx, my);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
float dx = Math.abs(mx - mStartX);
float dy = Math.abs(my - mStartY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mStartX, mStartY, (mx + mStartX)/2, (my + mStartY)/2);
mStartX = mx;
mStartY = my;
}
mCanvas.drawPath(mPath, mPaint);
invalidate();
break;
case MotionEvent.ACTION_UP:
isDrawing = false;
mPath.lineTo(mStartX, mStartY);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
invalidate();
break;
}
}
private void onDrawTriangle(Canvas canvas) {
if (countTouch < 3) {
canvas.drawLine(mStartX, mStartY, mx, my, mPaint);
} else if (countTouch == 3) {
canvas.drawLine(mx, my, mStartX, mStartY, mPaint);
canvas.drawLine(mx, my, basexTriangle, baseyTriangle, mPaint);
}
}
private void onTouchEventTriangle(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
countTouch++;
if (countTouch == 1) {
isDrawing = true;
mStartX = mx;
mStartY = my;
} else if (countTouch == 3) {
isDrawing = true;
}
invalidate();
break;
case MotionEvent.ACTION_MOVE:
invalidate();
break;
case MotionEvent.ACTION_UP:
countTouch++;
isDrawing = false;
if (countTouch < 3) {
basexTriangle = mx;
baseyTriangle = my;
mCanvas.drawLine(mStartX, mStartY, mx, my, mPaint);
} else if (countTouch >= 3) {
mCanvas.drawLine(mx, my, mStartX, mStartY, mPaint);
mCanvas.drawLine(mx, my, basexTriangle, baseyTriangle, mPaint);
countTouch = 0;
}
invalidate();
break;
}
}
public void clearDrawing()
{
setDrawingCacheEnabled(false);
onSizeChanged(width, height, width, height);
invalidate();
setDrawingCacheEnabled(true);
}
/**
* Getter of currentShape
*/
public int getCurrentShape() {
return currentShape;
}
/**
* Setter of currentShape
*/
public void setCurrentShape(int currentShape) {
this.currentShape = currentShape;
}
}
そして、何であなたを指摘しているように
希望:
は明らかにあなたは、このような何かをやり直しを行うことができるように別のリストに取り消し操作を保存する必要があります問題です?図形を元に戻す? – CoolMind