I like to use a for loop for stuff like this. However you can use paintutils if you redirect to the monitor.
Like this
mon = peripheral.wrap(monSide) --Wraps the peripheral
oldTerm = term.redirect(mon) --Redirects the term while storing the old term in a variable named oldTerm
coloredPortion = math.floor((currentPower/maxPower) * width) --Calculates the width of the colored portion
paintutils.drawLine(startX, y, startX + width, y, barColor) --Draws the bar
paintutils.drawLine(startX,y,startX + coloredPortion, coloredPart) --Draws the colored portion over the bar
term.redirect(oldTerm) --Sets the term back to normal
However if you have an irrational aversion to paintutils like myself or you don't want to redirect the term, you can create your own draw line method like this
function drawLine(x,y,length,color) --Defines the function
oldBgColor = term.getBackgroundColor() --Gets the current background color
for i = x, (length + x) do --Starts a for loop starting at x and ending when x gets to x + length
term.setCursorPos(i,y) --Set the cursor position to i,y
term.setBackgroundColor(color) --Set the background color to the color
term.write(" ") --Write that color to the screen
end
term.setBackgroundColor(oldBgColor) --Reset the background color
end
Of course should you decide to use this function you would have to tweak the first block of code. Just change the paintutils.drawLine() functions to this.
drawLine(startX, y, width, barColor) --Draws the bar
drawLine(startX, y, coloredPortion, coloredPart) --Draws the colored part over the bar
There you go, hope I could help.
