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我正在爲體系結構規劃製作應用程序。在那裏，我想通過drawline（）方法找到由線條繪製的封閉形狀覆蓋的區域。這是守則。計算由Android上的自定義線條創建的形狀區域
public class CanvasBackground extends View {
public static boolean addPath;
public static flg flag;
public static boolean addLine = false;
public static boolean join = false;
public static boolean isDrawing;
public static int myLine;
public static ArrayList<Line> lines = new ArrayList<>();
public static ArrayList<Path> paths = new ArrayList<>();
public Paint paint;
public Context context;
public Canvas canvas;
public ScaleGestureDetector scaleGestureDetector;
public Bitmap addBtnBitmap;
public int passed_size;
float scalfactor = 1f;
Button addBtn;
public CanvasBackground(Context context) {
super(context);
this.context = context;
paint = new Paint();
scaleGestureDetector = new ScaleGestureDetector(context, new CanvasScale());
DrawingActivity drawingActivity = new DrawingActivity();
passed_size = drawingActivity.getCategory();
setDrawingCacheEnabled(true);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
this.canvas = canvas;
canvas.save();
//add Button Select
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
DrawingZoomingCanvas(canvas);
DrawingLine(canvas);
canvas.restore();
Log.e("OnDraw >>>", "CALLING");
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (addLine) {
if (lines.size() != 0) {
Line current = lines.get(lines.size() - 1);
lines.add(new Line(current.stopX, current.stopY, myLine));
} else {
lines.add(new Line(event.getX(), event.getY(), myLine));
}
isDrawing = true;
addLine = false;
}
if (addPath) {
Path path = new Path();
path.moveTo(event.getX(), event.getY());
paths.add(path);
isDrawing = true;
addPath = false;
}
invalidate();
break;
case MotionEvent.ACTION_MOVE:
if (isDrawing) {
if (lines.size() > 0 && flg.ADDLINE == flag) {
Line current = lines.get(lines.size() - 1);
current.stopX = event.getX();
current.stopY = event.getY();
} else if (paths.size() > 0 && flg.ADDPATH == flag) {
Path path = paths.get(paths.size() - 1);
path.lineTo(event.getX(), event.getY());
}
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (isDrawing) {
if (lines.size() > 0 && flg.ADDLINE == flag) {
Line current = lines.get(lines.size() - 1);
current.stopX = event.getX();
current.stopY = event.getY();
}
invalidate();
}
break;
default:
break;
}
//scaleGestureDetector.onTouchEvent(event);
Log.e("OnTouch >>>", "CALLING " + isDrawing + " >> " + event.getX() + " >> " + event.getY() + ">>" + event.getAction());
return true;
}
//drawing a line
private void DrawingLine(Canvas canvas) {
paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(2);
paint.setAntiAlias(true);
for (Line l : lines) {
canvas.drawLine(l.startX, l.startY, l.stopX, l.stopY, paint);
canvas.drawText(String.valueOf(l.getSize()), l.startX, l.startY, paint);
}
for (Path l : paths) {
canvas.drawPath(l, paint);
}
if (flg.JOIN == flag) {
Line first = lines.get(0);
Line last = lines.get(lines.size() - 1);
Log.e("FL", "First:-" + first.startX + first.startY + "Last" + last.stopX + last.stopY);
canvas.drawLine(first.startX, first.startY, last.stopX, last.stopY, paint);
canvas.drawText(String.valueOf(myLine), last.stopX, last.stopY, paint);
invalidate();
isDrawing = true;
}
setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.e("CALL CLICK", "vv" + v.getId());
}
});
}
//drawing Matrix Canvas With Zoom
private void DrawingZoomingCanvas(Canvas canvas) {
//drawing Matarix
canvas.translate(scalfactor * 10, scalfactor * 10);
canvas.scale(scalfactor, scalfactor);
paint.setColor(Color.rgb(220, 220, 220));
for (int i = 0; i <= canvas.getHeight() * scalfactor; i += 10) {
canvas.drawLine(i, 0, i, canvas.getHeight(), paint);
canvas.drawLine(0, i, canvas.getWidth(), i, paint);
}
}
public void join_line() {
Line first = lines.get(0);
Line last = lines.get(lines.size() - 1);
Log.e("FL", "First:-" + first.startX + first.startY + "Last" + last.stopX + last.stopY);
canvas.drawLine(first.startX, first.startY, last.stopX, last.stopY, paint);
invalidate();
isDrawing = true;
}
public enum flg {ADDLINE, ADDPATH, JOIN}
private class CanvasScale extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
scalfactor *= scaleGestureDetector.getScaleFactor();
scalfactor = Math.max(0.1f, Math.min(scalfactor, 10.0f));
invalidate();
return true;
}
}
}
這是活動。
public class DrawingActivity extends AppCompatActivity {
public int line_size;
CanvasBackground canvasBackground;
LinearLayout linearLayoutV, linearLayoutH;
Button addBtn, confirmBtn, clearBtn, addPath, joinbtn;
Context context = DrawingActivity.this;
LinearLayout.LayoutParams wrap_content_layoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
canvasBackground = new CanvasBackground(context);
//Main Layout Liner
linearLayoutV = new LinearLayout(context);
linearLayoutV.setOrientation(LinearLayout.VERTICAL);
linearLayoutH = new LinearLayout(context);
linearLayoutH.setOrientation(LinearLayout.HORIZONTAL);
linearLayoutH.setWeightSum(4);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(10, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.weight = 1;
//add Line Button
addBtn = new Button(context);
addBtn.setLayoutParams(layoutParams);
addBtn.setText("Line+");
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CanvasBackground.addLine = true;
CanvasBackground.flag = CanvasBackground.flg.ADDLINE;
//**************** SET LENGTH
AlertDialog.Builder builder1 = new AlertDialog.Builder(context);
builder1.setMessage("Set the length of line");
builder1.setCancelable(true);
final EditText input = new EditText(DrawingActivity.this);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
builder1.setView(input);
builder1.setPositiveButton(
"Done",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
line_size = Integer.parseInt(input.getText().toString());
Log.e("size", String.valueOf(getCategory()));
CanvasBackground.myLine = line_size;
dialog.cancel();
}
});
builder1.setNegativeButton(
"Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert11 = builder1.create();
alert11.show();
}
});
linearLayoutH.addView(addBtn);
// join last button
joinbtn = new Button(context);
joinbtn.setLayoutParams(layoutParams);
joinbtn.setText("Join");
joinbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CanvasBackground.flag = CanvasBackground.flg.JOIN;
v.invalidate();
//**************** SET LENGTH
AlertDialog.Builder builder1 = new AlertDialog.Builder(context);
builder1.setMessage("Set the length of line");
builder1.setCancelable(true);
final EditText input = new EditText(DrawingActivity.this);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
builder1.setView(input);
builder1.setPositiveButton(
"Done",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
line_size = Integer.parseInt(input.getText().toString());
Log.e("size", String.valueOf(getCategory()));
CanvasBackground.myLine = line_size;
dialog.cancel();
}
});
builder1.setNegativeButton(
"Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert11 = builder1.create();
alert11.show();
}
});
linearLayoutH.addView(joinbtn);
//add Line Button
addPath = new Button(context);
addPath.setLayoutParams(layoutParams);
addPath.setText("Path+");
addPath.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CanvasBackground.addPath = true;
CanvasBackground.flag = CanvasBackground.flg.ADDPATH;
}
});
linearLayoutH.addView(addPath);
//add Confirm Button
confirmBtn = new Button(context);
confirmBtn.setLayoutParams(layoutParams);
confirmBtn.setText("Ok");
confirmBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CanvasBackground.isDrawing = false;
}
});
linearLayoutH.addView(confirmBtn);
linearLayoutV.addView(linearLayoutH);
linearLayoutV.addView(canvasBackground);
setContentView(linearLayoutV);
}
public int getCategory() {
return line_size;
}
}
這是整個代碼。請幫幫我。
你知道計算面積的公式嗎？如果你這樣做 - 將其轉換爲Java。如果你不 - 首先找到它，然後轉換。 –
也可以使用搜索找到現成的解決方案。 –
你是絕對正確的。但是沒有確定將繪製哪種形狀。 –