paintbox

paintbox doesnt paint from timer method c++ builder borland

由 ﹥＞﹥吖頭↗ 提交于 2019-12-24 22:01:14
问题 I am using Borland C++Builder 6. I have two methods of the form: void __fastcall FDisplay::PaintBox1Paint(TObject *Sender) void __fastcall FDisplay::TimerLabelsViewTimer(TObject *Sender) In the first method I draw the coordinate system. and in the second method I did: PaintBox1->Canvas->MoveTo(693,201); PaintBox1->Canvas->LineTo(770,187); and the line doesn't appear on the coordinate system. my second question, how can I erase the line and return to the base paint? Should I do this? PaintBox1

How to eliminate the flicker on the right edge of TPaintBox (for example when resizing)

由 只谈情不闲聊 提交于 2019-12-22 04:56:05
问题 Summarization: Say that I have a TForm and two panels. The panels are aligned alTop and alClient. The alClient panel contains a TPaintBox, whose OnPaint involve drawing codes. The default value of DoubleBuffered on the components are false. During the drawing process, flicker is obvious because the form, the panels all paint their background. Because the form is covered by the panels, it is probably fine to intercept its WM_ERASEBKGND message. If not, one could see flickering on the panels,

Delphi PaintBox without Key Events

由 好久不见. 提交于 2019-12-12 04:35:19
问题 I see my version of delphi, doesn't have Key Events(OnKeyDown, OnKeyUp, OnKeyPress) events for TPaintBox. I would like to process something like that. Had somebody a paintbox with these events? 回答1: Like TLama said, you'll need to inherit from TCustomControl. But you'll need some additional code to publish all keyboard events. You could choose the easy way and inherit from TPanel since TPanel already exposes a Canvas and a number of keyboard events. But here's some code to show how to create

How to eliminate the flicker on the right edge of TPaintBox (for example when resizing)

由 亡梦爱人 提交于 2019-12-05 05:29:41
Summarization: Say that I have a TForm and two panels. The panels are aligned alTop and alClient. The alClient panel contains a TPaintBox, whose OnPaint involve drawing codes. The default value of DoubleBuffered on the components are false. During the drawing process, flicker is obvious because the form, the panels all paint their background. Because the form is covered by the panels, it is probably fine to intercept its WM_ERASEBKGND message. If not, one could see flickering on the panels, and flickering on the right edge of the panels when the form is resized, because form paints its
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