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DimaP (2002-03-29 18:14) [0]

Рисуются на Canvas окружность (методом Arc, синего цвета) и прямая пересекающая эту окружность (чёрного цвета), подскажите pls, как автоматически обозначать точки пересечения другим цветом (может инверсия какая есть?)

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Alx2 (2002-03-29 18:18) [1]

Есть.
Поэксперементируй с Canvas.CopyMode, авось поможет.

Specifies how a graphical image is copied onto the canvas.

type TCopyMode = Longint;
property CopyMode: TCopyMode default cmSrcCopy;

Description

Set CopyMode to affect the way graphical images are drawn onto the canvas. The CopyMode is used when copying an image from another canvas using the CopyRect method. CopyMode is also used by TBitmap objects when they draw themselves to a canvas.

Use CopyMode to achieve a variety of affects when rendering an image. Achieve special effects like merged images and making parts of a bitmap transparent by combining multiple images with different CopyModes.

The following table shows the possible values of CopyMode. (These are constants defined in the Windows unit.)

Value Meaning

cmBlackness Fills the destination rectangle on the canvas with black.
cmDstInvert Inverts the image on the canvas and ignores the source.
cmMergeCopy Combines the image on the canvas and the source bitmap by using the Boolean AND operator.
cmMergePaint Combines the inverted source bitmap with the image on the canvas by using the Boolean OR operator.
cmNotSrcCopy Copies the inverted source bitmap to the canvas.
cmNotSrcErase Combines the image on the canvas and the source bitmap by using the Boolean OR operator, and inverts the result.

cmPatCopy Copies the source pattern to the canvas.
cmPatInvert Combines the source pattern with the image on the canvas using the Boolean XOR operator
cmPatPaint Combines the inverted source bitmap with the source pattern by using the Boolean OR operator. Combines the result of this operation with the image on the canvas by using the Boolean OR operator.
cmSrcAnd Combines the image on the canvas and source bitmap by using the Boolean AND operator.
cmSrcCopy Copies the source bitmap to the canvas.

cmSrcErase Inverts the image on the canvas and combines the result with the source bitmap by using the Boolean AND operator.
cmSrcInvert Combines the image on the canvas and the source bitmap by using the Boolean XOR operator.
cmSrcPaint Combines the image on the canvas and the source bitmap by using the Boolean OR operator.
cmWhiteness Fills the destination rectangle on the canvas with white.

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DimaP (2002-03-29 18:35) [2]

Огромное спасибо, попробую!

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