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badderjet

GDI+ refresh image: very basic GDI+ question

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Hi all,I've been programming analogue gauges for the past 2 years now and recently decided it was time to venture into the world of vector gauges.I downloaded Fred Clausens sample source and after some frustrating hours getting his code to work in MSVC6++ (had to add an include and redefine the ULONG_PTR variable) I was finally able to create a working gauge. i tried to make something very simple: an Ellipse that grows bigger and smaller based on Engine1 N1 (I created a local variable containing N1):case PANEL_SERVICE_PRE_DRAW:{ PELEMENT_STATIC_IMAGE pelement = (PELEMENT_STATIC_IMAGE)(pgauge->elements_list[0]->next_element[0]); if (pelement) { HDC hdc = pelement->hdc; PIXPOINT dim = pelement->image_data.final->dim; if (hdc) { Graphics graphics(hdc); Pen pen(Color(255, 0, 0, 255)); graphics.DrawEllipse(&pen, 100, 100, (int) N1_1, (int) N1_1); } SET_OFF_SCREEN (pelement); }}break;....OK, it's very basic but like I said it's a start. Now what happens is that FS2002 (my testbed) draws an ellipse that indeed increases and descreases size with N1 but... it doesn't clean up the previous draw ! I tried adding: Color blackColor(255, 0, 0, 0); graphics.Clear(blackColor);But this paints the whole area black and no ellipse can be seen anymore.This must be very basic stuff so, can anybody help me out here ?Thx for the help,Bj

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Where exactly did you put the redraw? Put it at the very beginning before every other drawing is done and it should clean up everything just fine upon every drawing cycle. :-)Etienne :-wave

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Etienne,Belief it or not but it just dawned on me a few minutes ago that I was indeed clearing at the end of the drawing proces :-eek Man, my brain must have been damaged somewhere along the way...Thx for the help,Bj

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I placed the Clear method in front of the drawing method and still nothing but a black canvas... strange !Bj

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Alright this is what happens: The gauge draws fine with the clear event first but only when I load the panel after first loading a different panel. Also when I resize the FS2002 window the drawing doesn't show until i reload the panel again.Hope this makes sense to someone...Bj

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Well, this sounds weirdo. *:-*Where did you put your initialization stuff? Try putting it into PANEL_CONNECT_TO_WINDOW.If nothing works, either ask or feel free to shoot me an eMail or PM.Good luck though, :-hahg'niteEtienne :-wave

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