3/10/2023 0 Comments Draw triangle free pascal![]() ![]() Procedure PaintAliased ( Canvas : TCanvas x, y : integer const TheText : string ) var w, h, dx, dy : Integer IntfImg : TLazIntfImage Img : TBitmap col : TFPColor FontColor, c : TColor begin w := 0 h := 0 Canvas. The fill color is determined by the color of the canvas's Brush, and the border color is given by the color of the canvas's Pen: You can pass rectangle's edge coordinates to the method either as four separate x/y values, or as a single TRect record. The TCanvas method for painting a rectangle is named very logically: Rectangle(). Never paint in an OnClick handler, because this painting is not persistent and will be erased whenever the operating system requests a repaint. For this purpose we must add code to the OnPaint event of the form. Suppose we want to draw a red rectangle with a 5-pixel-thick blue border in the center of the form, and the the rectangle should be half the size of the form. Let's use TForm as an example to demonstrate how to paint on a canvas. Such controls include TForm, TPanel and TPaintBox. Many controls expose their canvas as a public Canvas property (or via an OnPaint event). ![]() In the widgetset LCL-CustomDrawn the native classes are implemented using the non-native ones.Īll of these classes will be better described in the sections below. The non-native classes are guaranteed to perform exactly the same drawing in all platforms with a pixel level precision and they all perform reasonably fast in all platforms. The speed and also the exact final result of the image drawing can have differences. The main difference between the native classes and the non-native ones is that the native ones do not perform exactly the same in all platforms, because the drawing is done by the underlying platform itself.
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