Reputation: 6277
How to Draw a rectangle (Using Shape Resources) at the touched point(like coordinates 28,87). I have Created a shape Like This.
android:shape="rectangle" >
<solid
android:color="@color/transparent"/>
<stroke
android:width="3dp"
android:color="@color/green" />
This rectangle I want to Draw at the touch point on the image.
Upvotes: 2
Views: 7955
Reputation: 1723
@kam' solution needs an update I guess. Everything that was in the constructor must be in init() method and the constructors must be overwritten 3 times.
public class MyView extends View {
private float xDown = 0,yDown = 0, xUp = 0, yUp = 0;
Paint mPaint;
boolean touched = false;
public MyView(Context context) {
super(context);
init(context);
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
mPaint = new Paint();
mPaint.setColor(Color.BLUE);
mPaint.setStyle(Paint.Style.STROKE);
}
@Override
protected void onDraw (Canvas canvas) {
canvas.drawColor(Color.TRANSPARENT);
if(touched) {
canvas.drawRect(xDown, yDown, xUp, yUp, mPaint);
}
}
@Override
public boolean onTouchEvent (MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
xDown = event.getX();
yDown = event.getY();
xUp = 0;
yUp = 0;
break;
case MotionEvent.ACTION_MOVE:
xUp = event.getX();
yUp = event.getY();
touched = true;
break;
case MotionEvent.ACTION_UP:
xUp = event.getX();
yUp = event.getY();
touched = true;
break;
}
invalidate();
return true;
}
}
Upvotes: 2
Reputation: 6033
You can draw a shape on a view in the onDraw() method of that view. There is no method available for drawing a shape drawable on a view canvas.
And you don't have to use a shape drawable for drawing a rectangle. You can draw a rectangle using canvas.drawRect() method.
Here is a code for this:
public class MyView extends View{
float x,y;
Bitmap bmp;
Paint mPaint;
float width = 100.0f;
float height = 50.0f;
boolean touched = false;
public MyView (Context context)
{
super(context);
x = y = 0;
mPaint = new Paint();
mPaint.setColor(Color.BLUE);
mPaint.setStyle(Style.STROKE);
}
@Override
protected void onDraw (Canvas canvas)
{
canvas.drawColor(Color.WHITE);
if(touched)
{
canvas.drawRect(x, y, x+width, y+height, mPaint);
}
}
@Override
public boolean onTouchEvent (MotionEvent event)
{
touched = true;
//getting the touched x and y position
x = event.getX();
y = event.getY();
invalidate();
return true;
}
}
Upvotes: 3