I am trying to draw a diagonal line between two (x,y) coordinates using the GoLang "image" package import.
From what I can tell, the package allows for drawing rectangles, and has objects for horizontal and vertical lines, as described in this article.
I see image.Rect() to create a rectangle, which is needed to input into the draw.Draw() function
I see HLine() and VLine() functions for vertical and horizontal lines, which are used for the rectangles in the image.Rect() function.
However, I cannot figure out how to draw a custom line between any two coordinates. I want to input an x1, y1, x2, y2 format.
I have tried to draw the points on a diagonal line one at a time as 2x2 rectangles, using the slope-intercept formula.
for h := x1; h <= x2; h++ {
// make each dot drawn 2x2 instead of 1x1
// h is x coordinate of a pixel
//"int(float64(branch.root.y)+(float64(h)*slope)" is the y coordinate using slope
// intercept formula
currentDot := image.Rect(h, int(float64(branch.root.y)+(float64(h)*slope)),
h+1, int(float64(branch.root.y)+(float64(h)*slope))+1)
fmt.Println("point draw", h, int(float64(branch.root.y)+(float64(h)*slope)),
h+1, int(float64(branch.root.y)+(float64(h)*slope))+1)
// negative coordiantes don't allow it to be drawn
//fmt.Println("dot drawn")
draw.Draw(myImage, currentDot, &image.Uniform{white}, image.ZP, draw.Src)
However, it has given me trouble. Some of it is the math involved in coordinate calculation that I need to fix otherwise. But it would also be helpful to be able to draw diagonal lines from any two coordinates.
