[FREE] Draw a polygon, establish a scale and calculate its area

CalculateCanvasArea Extension

The CalculateCanvasArea extension is a tool that allows you to draw and calculate areas on a canvas using reference lines. With this extension, you can create shapes on a canvas, measure their areas, and perform various drawing operations. It’s a versatile tool for visual calculations and drawing tasks in app development.

SetRedLine

• Description: Sets the red reference line as the horizontal reference.
• Explanation: This method is used to draw a red horizontal line on the canvas. You specify the starting and ending points of the line, as well as its length in meters.

EndRedLine

• Description: End the red line.
• Explanation: This method marks the end of the previously drawn red line on the canvas.

SetBlueLine

• Description: Sets the blue reference line as the vertical reference.
• Explanation: Similar to the red line, this method is used to draw a blue vertical line on the canvas. You specify the starting and ending points of the line, as well as its length in meters.

EndBlueLine

• Description: End the blue line.
• Explanation: Marks the end of the previously drawn blue line on the canvas.

SetActualLengths

• Description: Sets the actual lengths of the reference lines.
• Explanation: You use this method to provide the actual (real-world) lengths of the red and blue reference lines in meters.

CalculateArea

• Description: Calculates the area of the green region.
• Explanation: This method calculates the area of the green region that you draw on the canvas. It takes into account the reference lines’ lengths and the shape you’ve drawn.

ConvertToGrayscale

• Description: Loads an image from a path and converts it to grayscale.
• Explanation: This method allows you to load an image from a file, convert it to grayscale (black and white), and save the converted image.

ResetAreaPoints

• Description: Resets the points in the green area.
• Explanation: If you’ve drawn multiple points to create a shape on the canvas, this method clears those points.

CalculateDistanceBetweenPoints

• Description: Calculates the distance between two points.
• Explanation: Given the coordinates of two points, this method calculates the straight-line distance between them.

GetTotalPointsCount

• Description: Gets the total number of points in the green area.
• Explanation: This method tells you how many points are currently defining the shape of the green area on the canvas.

GetAreaPerimeter

• Description: Calculates the perimeter of the green area.
• Explanation: This method calculates the total perimeter (outline) length of the shape you’ve drawn for the green area.

DrawLine

• Description: Draw a line on the active layer.
• Explanation: You can use this method to draw straight lines on the canvas. You specify the starting and ending points, color, and line thickness.

ClearCanvas

• Description: Clears the active layer.
• Explanation: This method erases all drawings and content from the canvas, effectively making it blank.

GetAreaPointsAsList

• Description: Returns the area points as a List.
• Explanation: This method retrieves all the points that define the shape of the green area and returns them as a list.

IsPointInPolygon

• Description: Checks whether a point is inside the polygon.
• Explanation: Given a set of points that define a shape, this method allows you to check if a specific point is inside or outside that shape.

UndoLastPoint

• Description: Undoes the addition of the last point.
• Explanation: If you’ve added points to create a shape and want to remove the most recently added point, you can use this method.

ImportPoints

• Description: Imports points into the polygon.
• Explanation: You can use this method to replace the current set of points that define the shape with a new set of points provided as a list.

SetCanvasSize

• Description: Set canvas dimensions.
• Explanation: This method allows you to change the size (width and height) of the canvas. It resizes the canvas while preserving its content.

• Description: Loads an image from a path and adds it to the active layer.
• Explanation: This method lets you load an image from a file and place it on the canvas as a background.

SetCanvas

• Description: Sets the Canvas component used for drawing.
• Explanation: This method associates the canvas with the extension, allowing you to draw on it.

GetCanvasWidth

• Description: Gets the width of the canvas.
• Explanation: This method returns the current width of the canvas.

GetCanvasHeight

• Description: Gets the height of the canvas.
• Explanation: This method returns the current height of the canvas.

Support

I hope this helps you understand the purpose and functionality of each of these methods in the `CalculateCanvasArea` extension. If you have any specific questions about any of these methods, feel free to ask! Click here to access my public group on Telegram.

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Looks so good!
good job man!

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Thank You!

You’re doing very good job continuously

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Thank you so much!

Excellent work

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Try using same approach in calculating for land size from realtime maps when someone draws shape on the map

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so with this extension you could make a collision detection system of moving polygons easier? It looks really useful, I was just looking for something like this, thanks!

I believe you totally misunderstood the function of this extension?

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I’m working on a project like this, but it’s on hold.

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