delphi 画布(国外英文资料).docVIP

delphi 画布(国外英文资料) The use of Delphi canvas Canvas The basic properties of canvas Canvas Primary attribute Font font property, Color font color Mode font type Style font style Pen brush property Color brush color How does the Mode brush work? The style of the Style brush The width of the Width brush Brush brush, Color brush color, determine the background color of the figure Style brush style to determine the filling pattern of the brush CopyMode copy mode cmDstInvert reverses target graphics CmMergeCopy performs the and operations of the target graph and the source image CmMergePaint reverses the source image and then performs or operations with the target image CmNotSrcCopy reverses the source image to copy CmNotSrcErase reverses the target image with or operation first CmPatCopy mode of fake source image The ClipRect property cuts the graph so that it is within the bounds of the rectangle The Handle handle property passes the Canvas.Handle to a HDC parameter The PenPos brush position property gives the brushs location The Pixels pixel property provides a two-dimensional array of individual pixels of the Canvas Two, the main methods of Canvas objects and their representative meanings are shown in the table Method meaning grammar Lineto draws the line LineTo (x, y:Integer); MoveTo specifies the location of the brush The Rectangle rectangle draws the rectangle on the canvas Canvas ELliPse round on the canvas Canvas to draw a circle and ellipse The Arc arc draws an arc on the ellipse The Brushcopy brush copy copies a portion of the bitmap to a rectangular area of the canvas and replaces the color of the bitmap with the current color on the canvas The Chord string is used to connect two points on the ellipse CopyRect copies part of the image from the source canvas object to the target canvas Draw draws the image specified by Graphic at the given pixel coordinates (x, y) of the canvas, which can be bitmaps, icons, or meta bitmaps DrawFocuseRect draws a rectangle to ind