📄 tutorials_tut03.html
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<h1 style="margin-top:0px">Tutorial 03 - Using helper classes</h1>
<p>
<b>I</b>n this tutorial we will learn how to use some of <b>HGE</b> helper classes.
First, we include all the needed headers and declare the global pointer to
the <b>HGE</b> interface that is required by most of the helper classes to work:
</p>
<pre>
#include <hge.h>
#include <hgesprite.h>
#include <hgefont.h>
#include <hgeparticle.h>
HGE *hge=0;
</pre>
<p>
Now we declare the pointers to the <b>HGE</b> objects we will use.
</p>
<pre>
hgeSprite* spr;
hgeSprite* spt;
hgeFont* fnt;
hgeParticleSystem* par;
HTEXTURE tex;
</pre>
<p>
In the <b>FrameFunc</b> (frame function) we update the particle system object:
we adjust it's emission rate based on the current sprite
speed and move it to the current sprite location.
</p>
<pre>
par->info.nEmission=(int)(dx*dx+dy*dy)*10;
par->MoveTo(x,y);
par->Update(dt);
</pre>
<p>
Then we render all our objects, calling their render methods:
</p>
<pre>
hge->Gfx_BeginScene();
hge->Gfx_Clear(0);
par->Render();
spr->Render(x, y);
fnt->printf(5, 5, "dt:%.3f\nFPS:%d", dt, hge->Timer_GetFPS());
hge->Gfx_EndScene();
</pre>
<p>
In the <b>WinMain</b> function after <b>HGE</b> is initiated we
create the <b>HGE</b> objects, that we will use. First, we create
and set up a sprite:
</p>
<pre>
spr=new hgeSprite(tex, 96, 64, 32, 32);
spr->SetColor(0xFFFFA000);
spr->SetHotSpot(16, 16);
</pre>
<p>
Then we load a font. The font is represented with two disk files:
<b>font1.fnt</b> and <b>font1.png</b>.
</p>
<pre>
fnt=new hgeFont("font1.fnt");
</pre>
<p>
We create a particle system and a sprite for it:
</p>
<pre>
spt=new hgeSprite(tex, 32, 32, 32, 32);
spt->SetBlendMode(
BLEND_COLORMUL | BLEND_ALPHAADD | BLEND_NOZWRITE);
spt->SetHotSpot(16, 16);
par=new hgeParticleSystem("trail.psi", spt, 0);
par->Fire();
</pre>
<p>
Now all our objects have been created and we start the game loop:
</p>
<pre>
hge->System_Start();
</pre>
<p>
When the game loop is finished, we delete all created <b>HGE</b> objects:
</p>
<pre>
delete par;
delete fnt;
delete spt;
delete spr;
</pre>
<p>
The rest of shutdown process is identical to the one demonstrated in previous tutorials.
<br><br>
The complete source code with detailed comments for this tutorial you may find in the folder
<b>tutorials\tutorial03</b>. The required media files you'll find in the folder <b>tutorials\precompiled</b>.
</p>
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