openblt

a hobby OS from the late 90s
git clone http://frotz.net/git/openblt.git
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main.cpp (2709B)

      1 #include <blt/os.h>
      2 #include <blt/syscall.h>
      3 #include <blt/qsem.h>
      4 #include <win/Window.h>
      5 #include <win/Canvas.h>
      6 #include <win/Event.h>
      7 #include <stdio.h>
      8 #include <string.h>
      9 #include <stdlib.h>
     10 
     11 const int kCellWidth = 10;
     12 
     13 class DrawingArea : public Canvas {
     14 public:
     15 	DrawingArea();
     16 	virtual void EventReceived(const Event*);
     17 private:
     18 	int fLastX;
     19 	int fLastY;
     20 	bool fButtonDown;
     21 };
     22 
     23 class PaletteArea : public Canvas {
     24 public:
     25 	PaletteArea(DrawingArea *draw);
     26 	virtual void EventReceived(const Event*);
     27 	virtual void Repaint(long left, long top, long right, long bottom);
     28 private:
     29 	DrawingArea *fDrawingArea;
     30 	int fCurrentColor;
     31 };
     32 
     33 DrawingArea::DrawingArea()
     34 	:	fButtonDown(false)
     35 {
     36 }
     37 
     38 void DrawingArea::EventReceived(const Event *event)
     39 {
     40 	switch (event->what) {
     41 	case EVT_MOUSE_DOWN:
     42 		LockMouseFocus();
     43 		fButtonDown = true;
     44 		fLastX = event->x;
     45 		fLastY = event->y;
     46 		break;
     47 		
     48 	case EVT_MOUSE_UP:
     49 		fButtonDown = false;
     50 		break;
     51 		
     52 	case EVT_MOUSE_MOVED:
     53 		if (fButtonDown) {
     54 			printf("DrawLine(%d, %d, %d, %d)\n", fLastX, fLastY, event->x, event->y);
     55 			DrawLine(fLastX, fLastY, event->x, event->y);
     56 			fLastX = event->x;
     57 			fLastY = event->y;
     58 			GetWindow()->Flush();
     59 		}		
     60 
     61 		break;
     62 	
     63 	default:
     64 		Canvas::EventReceived(event);
     65 	
     66 	}
     67 }
     68 
     69 PaletteArea::PaletteArea(DrawingArea *draw)
     70 	:	fDrawingArea(draw)
     71 {
     72 }
     73 
     74 void PaletteArea::EventReceived(const Event *event)
     75 {
     76 	switch (event->what) {
     77 	case EVT_MOUSE_DOWN:
     78 		printf("PaletteArea: EventReceived\n");
     79 		fDrawingArea->SetPenColor(event->x / kCellWidth * 2);
     80 		Invalidate(fCurrentColor * kCellWidth, 0, fCurrentColor * kCellWidth + kCellWidth, 10);
     81 		fCurrentColor = event->x / kCellWidth;
     82 		Invalidate(fCurrentColor * kCellWidth, 0, fCurrentColor * kCellWidth + kCellWidth, 10);
     83 		break;
     84 	
     85 	default:
     86 		Canvas::EventReceived(event);
     87 	}
     88 }
     89 
     90 void PaletteArea::Repaint(long left, long top, long right, long bottom)
     91 {
     92 	int x = (left / kCellWidth) * kCellWidth;
     93 	while (x < right) {
     94 		SetPenColor(x / kCellWidth * 2);
     95 		FillRect(x, top, x + kCellWidth, bottom);
     96 		if (x / kCellWidth == fCurrentColor) {
     97 			SetPenColor(0);
     98 			DrawLine(x, top, x + kCellWidth, top);
     99 			DrawLine(x, bottom, x + kCellWidth, bottom);
    100 			DrawLine(x, top, x, bottom);
    101 			DrawLine(x + kCellWidth, top, x + kCellWidth, bottom);
    102 		}
    103 		
    104 		x += kCellWidth;
    105 	}
    106 }
    107 
    108 int main()
    109 {
    110 	Window *win = new Window(50, 30, 270, 180);
    111 	win->Lock();
    112 	win->Show();
    113 	Canvas *border = new Canvas;
    114 	win->AddChild(border, 0, 0, 250, 150);
    115 	border->SetBackgroundColor(10);
    116 	DrawingArea *draw = new DrawingArea;
    117 	PaletteArea *palette = new PaletteArea(draw);
    118 	border->AddChild(draw, 2, 2, 218, 139);
    119 	border->AddChild(palette, 2, 140, 218, 148);
    120 	draw->SetBackgroundColor(250);
    121 	win->Unlock();
    122 	return 0;
    123 }