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Mandelbrot: Add 'box-select-to-zoom' support.

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This commit is contained in:
Augustin Cavalier 2016-06-18 13:11:28 -04:00
parent c80973eb36
commit fb292a367a
1 changed files with 80 additions and 10 deletions
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78
src/apps/mandelbrot/Mandelbrot.cpp
View File

@ -15,6 +15,8 @@
#include <View.h>
#include <Window.h>
#include <algorithm>
#include "FractalEngine.h"
#undef B_TRANSLATION_CONTEXT
@ -32,17 +34,30 @@ public:
virtual void AttachedToWindow();
virtual void FrameResized(float, float);
virtual void Pulse();
virtual void MouseDown(BPoint where);
virtual void MouseMoved(BPoint where, uint32 mode, const BMessage*);
virtual void MouseUp(BPoint where);
virtual void MessageReceived(BMessage* msg);
virtual void Draw(BRect updateRect);
FractalEngine* fFractalEngine;
void RedrawFractal();
FractalEngine* fFractalEngine;
private:
BRect GetDragFrame();
bool fSizeChanged;
bool fOwnBitmap;
BPoint fSelectStart;
BPoint fSelectEnd;
bool fSelecting;
uint32 fMouseButtons;
BBitmap* fDisplayBitmap;
double fLocationX;
double fLocationY;
double fSize;
@ -55,11 +70,13 @@ FractalView::FractalView()
fFractalEngine(NULL),
fSizeChanged(false),
fOwnBitmap(false),
fSelecting(false),
fDisplayBitmap(NULL),
fLocationX(0),
fLocationY(0),
fSize(0.005)
{
SetHighColor(make_color(255, 255, 255, 255));
}
@ -102,19 +119,68 @@ void FractalView::Pulse()
RedrawFractal();
}
BRect FractalView::GetDragFrame()
{
BRect dragZone = BRect(std::min(fSelectStart.x, fSelectEnd.x),
std::min(fSelectStart.y, fSelectEnd.y),
std::max(fSelectStart.x, fSelectEnd.x),
std::max(fSelectStart.y, fSelectEnd.y)),
frame = Frame();
float width = dragZone.Width(),
height = width * (frame.Height() / frame.Width());
float x1 = fSelectStart.x, y1 = fSelectStart.y, x2, y2;
if (fSelectStart.x < fSelectEnd.x)
x2 = x1 + width;
else
x2 = x1 - width;
if (fSelectStart.y < fSelectEnd.y)
y2 = y1 + height;
else
y2 = y1 - height;
return BRect(x1, y1, x2, y2);
}
void FractalView::MouseDown(BPoint where)
{
uint32 buttons;
GetMouse(&where, &buttons);
fSelecting = true;
fSelectStart = where;
GetMouse(NULL, &fMouseButtons);
}
void FractalView::MouseMoved(BPoint where, uint32 mode, const BMessage*)
{
if (fSelecting) {
fSelectEnd = where;
Invalidate();
}
}
void FractalView::MouseUp(BPoint where)
{
BRect frame = Frame();
fSelecting = false;
if (fabs(fSelectStart.x - where.x) > 4) {
fSelectEnd = where;
BRect dragFrame = GetDragFrame();
BPoint lt = dragFrame.LeftTop();
float centerX = lt.x + dragFrame.Width() / 2,
centerY = lt.y + dragFrame.Height() / 2;
fLocationX = ((centerX - frame.Width() / 2) * fSize + fLocationX);
fLocationY = ((centerY - frame.Height() / 2) * -fSize + fLocationY);
fSize = (dragFrame.Width() * fSize) / frame.Width();
} else {
fLocationX = ((where.x - frame.Width() / 2) * fSize + fLocationX);
fLocationY = ((where.y - frame.Height() / 2) * -fSize + fLocationY);
if (buttons & B_PRIMARY_MOUSE_BUTTON)
if (fMouseButtons & B_PRIMARY_MOUSE_BUTTON)
fSize /= 2;
else
fSize *= 2;
}
RedrawFractal();
}
@ -152,6 +218,10 @@ void FractalView::RedrawFractal()
void FractalView::Draw(BRect updateRect)
{
DrawBitmap(fDisplayBitmap, updateRect, updateRect);
if (fSelecting) {
StrokeRect(GetDragFrame());
}
}