This article introduces a random number generator that comes in under opencv class RNG, I use this class to draw some graphics, and study notes based on opencv (13): Basic Drawing a text similar to just draw out the image coordinates, size, color, angle, and all information is random, and this class of RNG. Reference to the opencv own tutiol its code. Development environment: opencv2.4.2+Qt4.8.2+ubuntu12.04+QtCreator2.5 experimental features: (1) The experiment can draw 6 geometry and a text display, each painting are 80 per unfinished a delay of 100ms. 2 Open the software, the default picture shows the straight lines of the painting. Different geometric painting graphics and text in the lower left corner of the software Drawing Type drop-down list, select the six kinds of geometry for drawing straight lines, draw a rectangle, draw elliptical arc, polygon drawing, draw a circle, draw filled polygons. The text display to show " OpenCv Forever!" , Select exhausted in the window w

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