paint

Make certain area of bitmap transparent on touch

import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.BlurMaskFilter.Blur; import android.graphics.BitmapFactory; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; public class StartActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(new TouchView(this)); } class TouchView extends View{ Bitmap bgr; Bitmap overlayDefault; Bitmap … Read more

Drawing a rectangle that won’t disappear in next paint

Start with this approach – based around a BufferedImage as the painting surface.. import java.awt.*; import java.awt.RenderingHints.Key; import java.awt.event.*; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.imageio.ImageIO; import javax.swing.*; import javax.swing.border.*; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import javax.swing.filechooser.FileFilter; import javax.swing.filechooser.FileNameExtensionFilter; public class BasicPaint { /** Reference to the original image. */ private … Read more

PictureBox PaintEvent with other method

You need to decide what you want to do: Draw into the Image or draw onto the Control? Your code is a mix of both, which is why it doesn’t work. Here is how to draw onto the Control: private void pictureBox1_Paint(object sender, PaintEventArgs e) { e.Graphics.DrawEllipse(Pens.Red, new Rectangle(3, 4, 44, 44)); .. } Here … Read more