private void DoDraw(Canvas canvas) { // Increment / reset size += delta; if (size > 250) { delta = -1; } else if (size < 30) { delta = 1; } // Set background color canvas.DrawColor(Color.BLUE); var paint = new Paint(); paint.SetTextAlign(Paint.Align.CENTER); // Draw some lines canvas.DrawLine(mX, mY, mY + 33, mX + 100, paint); paint.SetColor(Color.RED); paint.SetStrokeWidth(10); canvas.DrawLine(87, 0, 75, 100, paint); paint.SetColor(Color.GREEN); paint.SetStrokeWidth(5); for (int y = 30, alpha = 128; alpha > 2; alpha >>= 1, y += 10) { paint.SetAlpha(alpha); canvas.DrawLine(mY, y, mY + 100, y, paint); } // Draw a red rectangle paint.SetColor(Color.RED); var rect = new Rect(); rect.Set(size + 120, 130, size + 156, 156); canvas.DrawRect(rect, paint); // Draw a circle paint.SetColor(Color.ParseColor("#ffd700")); canvas.DrawCircle(size * 2, 220, 30, paint); //faster circle // Draw red'ish rectangle paint.SetColor(Color.Rgb(128, 20, 20)); canvas.DrawRect(size, 67, 68, 45, paint); // Draw green circle paint.SetColor(Color.GREEN); canvas.DrawCircle(size, 140.0f - size / 3, 45.0f, paint); //move circle across screen paint.SetColor(Color.RED); canvas.DrawText("Dot42", size, 140.0f - size / 3, paint); // Draw magenta circle paint.SetColor(Color.MAGENTA); canvas.DrawCircle(mX, mY, size / 4.0f, paint); //move circle down screen paint.SetColor(Color.GREEN); canvas.DrawText("is", mX, mY, paint); // Draw yellow rectangle paint.SetAlpha(64); paint.SetColor(Color.YELLOW); canvas.DrawRect(size, size, size + 45, size + 45, paint); // Draw text on rectangle paint.SetAlpha(255); paint.SetColor(Color.DKGRAY); canvas.DrawText("fun!", size + 45 / 2, size + 45 / 2, paint); }