Draw rounded rectangle using RectF and canvas?
android
Solution
Actually here your `RectF` representing `Point` not `Rectangle`, that's why you are unable to see `Rect`...
RectF rectF = new RectF(left, top, right, bottom);
and here `RectF` is
RectF rectf = new RectF(200, 400, 200, 400); // representing Point
here `left = right = 200` and `top = bottom = 400` which represents a `Point`
if you want to draw a `Rect` of `width = 200` and `height = 400`, then your `RectF` should be
RectF rectf = new RectF(0, 0, 200, 400);
and for `width = 400 and height = 200`, `RectF` should be
RectF rectf = new RectF(0, 0, 400, 200);
Problem
I'm attempting to draw a rounded rectangle using RectF and canvas.drawRoundRect(). Please see my code below: ``` package com.example.test; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.RelativeLayout; import android.graphics.RectF; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Create main RL params RelativeLayout.LayoutParams rlMainlayoutParams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); // Create main relative layout RelativeLayout rlMain = new RelativeLayout(this); rlMain.setLayoutParams(rlMainlayoutParams); //rlMain.setBackgroundResource(R.drawable.bgndlogin); rlMain.setBackgroundColor(Color.WHITE); RectF rectf = new RectF(200, 400, 200, 400); CustomRectangle customRectangle = new CustomRectangle(this, rectf, 5, 5, "#FFFF00"); // rlMain.addView(customRectangle); setContentView(rlMain); } //!< Draw the log in rectangle shaped panel public class CustomRectangle extends View { Paint paint; float left_side, top_side; String color; RectF rectf; //!< Constructor for the log in rectangle shaped panel public CustomRectangle(Context context, RectF rectf, float left_side, float top_side, String color) { super(context); this.rectf = rectf; this.left_side= left_side; this.top_side = top_side; this.color = color; } //!< Implement to draw the rectangle @Override public void onDraw(Canvas canvas) { paint = new Paint(); paint.setColor(Color.parseColor(color)); paint.setStrokeWidth(3); //paint.setAlpha(61); canvas.drawRoundRect(rectf, left_side, top_side, paint); } } } ``` The program runs but nothing gets drawn i.e. I just get my white background screen. Any ideas as to why? Note: I'm creating my relative layout programatically as opposed to using XML for scaling purposes.