Open CV Draw

• thinkness extend size

line

• line (inputoutput, point, point, scalar(color), thickness, linetype, int shift bit > 0)
• shift move position only

• arrowedLine(same, double tip length = 0.1 size of tip)

• drawMarker(img, pt, color, markertype, size, thick, linetype)

line Figure

• rectengular(line arguments) or (two point to rect)
• if thinkness is minus → fill rect

• circle(img, center, radius, color, thickness, linetype, shift)

• elipse(img, center, axes, angle, startAngle, endAngle, color, thickness, lineType, shift)

• polylines(img, pts(vector<points >usually), bool closed, color, thickness, linetype, shift)

Text

• putText(img, text, org(left bottom), fibtface from hersheyFonts, fontscale, color, thickness, linetype, bottomeleftorgin if false → leftTop)

• getTextSize(text, fontFace, fontScale, thickness, baseline) - do not include all size - little small