Baseball positions and ballpark structure drawn in R with baseball position numbers

On September 15, the 2024 KBO League will enter the 10 million attendance era for the first time ever. To celebrate, we're writing this post. In baseball, the role of each position is an important factor that can make or break a game. In the content below Describe baseball positions and use R to visualize ballpark structure and positions.so you can visually understand where each position is located and what it does. If you're new to baseball, or just curious about the roles of the positions, this post will give you one of the most fundamental pieces of baseball knowledge.

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Understanding the basics of baseball positions

There are nine positions in baseball, each of which plays a unique role on the field. Baseball position numbersis numbered 1 through 9, with each number representing a specific position. For example, 1 is the Pitcher, 2 is the Catcherfor the position. These position numbers play an important role in various situations during a match.

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Baseball position numbers and roles

  1. 1: Pitcher - Pitchers are the primary ball throwers. From the mound to the batter, they throw the ball and play an important role in the flow of the game.
  2. No. 2: Catcher - The catcher is behind the batter and receives the ball thrown by the pitcher, and is an important position for defense and game management.
  3. No. 3: First Baseman (First Baseman) - The first baseman is positioned at first base and plays defense when a batter advances to first base.
  4. Number 4: Second Baseman - The second baseman plays defense near second base and is the centerpiece of the infield defense.
  5. No. 5: Third Baseman - A third baseman defends third base and needs to react quickly when an opponent runs to third base.
  6. No. 6: Shortstop - The shortstop sits between second and third base and is an important pillar of the infield defense.
  7. No. 7: Left Fielder - Left fielders play defense in the left side of the outfield and are responsible for catching long balls and fly balls to the outfield.
  8. No. 8: Center Fielder (Center Fielder) - The center fielder plays defense in the center of the outfield and is the centerpiece of the outfield.
  9. No. 9: Right Fielder - Right fielders play defense on the right side of the outfield and are responsible for catching balls and throwing out balls quickly.

Like this Baseball Positionsplays an important role in the flow of the game, and each position works together to strengthen the team's defense.

Drawing a Baseball Field Structure in R: Visualizing Positions

Now, the Visualize the Structure of a Baseball Field and Baseball Positions Using RThis makes it easy to understand where each position is located in the ballpark. Using R's visualization library ggplot2to draw a simple baseball field and positions.

Below is the R code and a detailed explanation of how to draw the ballpark structure in a diamond shape, removing coordinate lines and unnecessary elements.

R code: Draw a diamond-shaped baseball field and positions

# Load the required libraries
library(ggplot2)

Set the coordinates of the # baseball field diamond shape (home-1b-2b-3b-home)
baseball_field <- data.frame(
    x = c(0, 90, 0, -90, 0), # home, first base, second base, third base, back to home coordinates
    y = c(0, 90, 180, 90, 0)
)

Setting up the # position data (displaying the number and Korean/English with line wrapping)
positions <- data.frame(
    position = c("1. Pitcher", "2. Catcher", "3. First Baseman",
                 "4. Second Baseman", "5. Third Baseman", "6. Shortstop",
                 "7. Left Fielder", "8. Center Fielder", "9. Right Fielder"),
    x = c(0, 0, 90, 45, -90, -45, -130, 0, 130), # x coordinates based on position
    y = c(60, -10, 90, 120, 90, 120, 180, 210, 180), y coordinates based on # position
    vjust = c(-1, -1, -1, -1, -1, -1, -1, 2, 2, 2) # Set vertical alignment of text for each position
)

# Code to plot the ballpark and positions
ggplot() +
    geom_polygon(data = baseball_field, aes(x = x, y = y), fill = "green", color = "white", size = 1.5) + # Draw a diamond
    geom_point(data = positions, aes(x = x, y = y), color = "red", size = 5) + # Draw a position point
    geom_text(data = positions, aes(x = x, y = y, label = position, vjust = vjust), color = "blue", size = 6) + # Show position names
    theme_void() # Remove unnecessary axes and coordinates

Full code description

1. Load the libraries you need
library(ggplot2)
  • ggplot2The most widely used visualization package in R. ggplot2to visualize the diamond structure of a baseball field and each position. This package makes it easy to draw visualization elements (shapes, text, points, etc.) based on dataframes.
2. Set Baseball Field Diamond Shape Coordinates
Set # Baseball Field Diamond Shape Coordinates (Home-1st-2nd-3rd-Home)
baseball_field <- data.frame(
  x = c(0, 90, 0, -90, 0), # home, first base, second base, third base, back to home coordinates
  y = c(0, 90, 180, 90, 0)
)
  • baseball_field dataframe: Sets the coordinates for drawing the shape of a baseball diamond.
  • x coordinate: X coordinates starting at home base, moving to first base (+90), then to second base (0), then to third base (-90), then back to home.
  • y coordinate: Y coordinates starting at home (0), going to first base (90), second base (180), third base (90), and back to home.
  • With these coordinates, you can visually draw the shape of the diamonds on the baseball field.
3. Setting up position data
Setting up # position data (displaying numbers and Korean/English with line breaks)
positions <- data.frame(
  position = c("1. Pitcher", "2. Catcher", "3. First Baseman",
               "4. Second Baseman", "5. Third Baseman", "6. Shortstop",
               "7. Left Fielder", "8. Center Fielder", "9. Right Fielder"),
  x = c(0, 0, 90, 45, -90, -45, -130, 0, 130), # x coordinates based on position
  y = c(60, -10, 90, 120, 90, 120, 180, 210, 180), y coordinates based on # position
  vjust = c(-1, -1, -1, -1, -1, -1, -1, 2, 2, 2) # Set vertical alignment of text for each position
)
  • positions dataframe: Vertical alignment of the name, coordinates, and text for each position (vjust) in the configuration file.
  • position: Name each position in the format "No. Korean name\N(English name)" format. \nmeans a line wrap, which moves the English name down one line.
    • Example: 1. Pitcher, 2. Catcher etc.
  • x, y coordinatesSets where each position is located on the baseball field. These coordinates are set based on where each position is located on a real baseball field.
    • Pitcher 1 (Pitcher)is located on the mound, x = 0, y = 60in the configuration file.
    • No. 2 Catcheris located behind the bat, x = 0, y = -10in the configuration file.
    • No. 7 Left Fielder (Left Fielder)is in the left side of the outfield, x = -130, y = 180in the configuration file.
  • vjust: Sets the vertical alignment value so that each position text appears above or below the dot.
    • vjust = -1The : text is displayed above the dot. This applies to positions 1 through 6.
    • vjust = 2The : text appears below the dot. This applies to the 7 (left fielder), 8 (center fielder), and 9 (right fielder) positions.
4. Code to Draw a Ballpark and Positions
ggplot() + #
  geom_polygon(data = baseball_field, aes(x = x, y = y), fill = "green", color = "white", size = 1.5) + # Draw a diamond
  geom_point(data = positions, aes(x = x, y = y), color = "red", size = 5) + # Draw a position point
  geom_text(data = positions, aes(x = x, y = y, label = position, vjust = vjust), color = "blue", size = 4) + # Show position names
  theme_void() # Remove unnecessary axes and coordinates

ggplot()

  • ggplot()is the default function for plotting graphs in R. This function uses the geom_polygon(), geom_point(), geom_text() and other visualization elements.

geom_polygon() Function

  • geom_polygon()is a function that draws the shape of a diamond on a baseball field.
  • data = baseball_field: Coordinate data for drawing the diamond. We'll use the previously defined baseball_field Use a dataframe to draw a diamond that goes from home-1st base-2nd base-3rd base-home.
  • fill = "green": Fill the ballpark field with green color.
  • color = "white": Set the border to white to define the boundaries of the diamond.
  • size = 1.5: Set the thickness of the border to emphasize the diamond border.

geom_point() Function

  • geom_point()is a function that takes a red dot to represent the position of each position.
  • data = positions: Displays a point based on the coordinates of the position.
  • color = "red": Represents the position as a red dot.
  • size = 5: Set the size of the dot so that the position is clearly visible.

geom_text() Function

  • geom_text()is a function that displays the name of each position as text above (or below) the dot.
  • label = position: Displays the position name (number. Korean name \n English name).
  • vjust: positions The vjust value to display the text for each position above or below the dot.
    • Positions 1 through 6 are shown above the dot, and positions 7 through 9 are shown below the dot.
  • color = "blue": Set the text color to blue to make it more readable.
  • size = 4: Set the text size to make it clearly visible.

theme_void() function

  • theme_void()removes unnecessary axes, coordinate lines, backgrounds, etc. from the graph so that only fields and positions can be visualized cleanly.

Wrap-up: Visualizing baseball positions with R

In this post, we covered a basic explanation of baseball positions and how to use R to visualize a baseball field. Understanding the roles of the positions through the baseball position numbers and English names, and visualizing them in R gave us a clearer insight into the game. We hope this post will help you have more fun understanding the game of baseball!

If you're here to learn baseball trivia and you're thinking, "Wow, there's a whole world out there, I wonder if I should try it?", you'll want to start with the Installing R, RStudio - Windows We encourage you to take a look at the post.

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