quells / dotplotter

Go package for drawing dots.

dotplotter

Go package for drawing dots.

Usage

c := NewCanvas(w, h, xmin, xmax, ymin, ymax)

Creates a canvas with an image of size (w, h) in pixels and a model space spanning from (xmin, ymin) to (xmax, ymax). The model space does not have to be 1:1 with the pixel space in the image, nor do the x-scale and y-scale need to be the same. Dots will always be drawn as circles, however; unequal axis scales will not result in ellipses.

fillColor := DefaultColor("clr")

A map[string]color.RGBA that provides RGB instances for common colors. Includes black, white, red, orange, yellow, green, blue, and purple. If the string is not in the map, then it returns a clear color.

c.DrawCircleAt(x, y, r, fillColor)

Draws a dot of radius r on the canvas' image centered at the position (x, y) in model-space filled with fillColor. Positive x-y (quadrant I) is in the upper-right.

c.ExportToPNG("test.png")

Saves the image to the current working directory.

Example

Generated with example.go