8 replies to this topic

[demon]

How would you go about rotating a sprite and THEN changing the scale with gml drawing functions?

Heres an example(This is done by scaling the room which is not what I want to do):

Edited by demon, 25 April 2012 - 08:43 PM.

[loverock125]

Doesn't draw_sprite_ext do that?

draw_sprite_ext(sSpr,-1,x,y,1.5,1.5,60,c_white,1);

[Nocturne]

That won't work as what he wants is the sprite to maintain the angle of scaling while the texture has the rotation. You will probably need to use textured primitives for this...

[loverock125]

That won't work as what he wants is the sprite to maintain the angle of scaling while the texture has the rotation. You will probably need to use textured primitives for this...

What about saving the rotated sprite in a surface, use sprite_assign to replace the old one and then use draw_sprite_ext to scale it?

[TheSnidr]

Or you can use transformations:

d3d_transform_set_rotation_z(image_angle)
d3d_transform_add_scaling(image_xscale, image_yscale, 0)
d3d_transform_add_translation(x, y, 0)
draw_sprite_ext(sprite_index, 0, 0, 0, 1, 1, 0, image_blend, image_alpha)
d3d_transform_set_identity()

Not tested, but I believe it should work. You do not have to start 3D mode to use transformation functions. The first one rotates the image, the second one scales it, and the third one moves it to the correct coordinates. The last one is needed to prevent stuff drawn afterwards from being affected by the transformation

[IceMetalPunk]

I'd go with TheSnidr's method, as it's much simpler than working out the math for the verticies of a textured primitive with rotation and scaling. The only change I'd suggest is using push and pop to maintain the transformation state instead of resetting to the identity. For the most part, it won't make a difference, but in the case that you do add other transformations later, it will save you some headaches.

d3d_transform_stack_push();
d3d_transform_set_rotation_z(image_angle);
d3d_transform_add_scaling(image_xscale, image_yscale, 0);
d3d_transform_add_translation(x, y, 0);
draw_sprite_ext(sprite_index, 0, 0, 0, 1, 1, 0, image_blend, image_alpha);
d3d_transform_stack_pop();

-IMP

[demon]

Or you can use transformations:

d3d_transform_set_rotation_z(image_angle)
d3d_transform_add_scaling(image_xscale, image_yscale, 0)
d3d_transform_add_translation(x, y, 0)
draw_sprite_ext(sprite_index, 0, 0, 0, 1, 1, 0, image_blend, image_alpha)
d3d_transform_set_identity()

Not tested, but I believe it should work. You do not have to start 3D mode to use transformation functions. The first one rotates the image, the second one scales it, and the third one moves it to the correct coordinates.

Worked perfectly, thanks a bunch! Thats a neat little trick using D3D functions for 2D.

[loverock125]

Or you can use transformations:

d3d_transform_set_rotation_z(image_angle)
d3d_transform_add_scaling(image_xscale, image_yscale, 0)
d3d_transform_add_translation(x, y, 0)
draw_sprite_ext(sprite_index, 0, 0, 0, 1, 1, 0, image_blend, image_alpha)
d3d_transform_set_identity()

Not tested, but I believe it should work. You do not have to start 3D mode to use transformation functions. The first one rotates the image, the second one scales it, and the third one moves it to the correct coordinates.

Worked perfectly, thanks a bunch! Thats a neat little trick using D3D functions for 2D.

I tried this before posting and it has the same result as draw_sprite_ext. Maybe I couldn't notice any difference on the texture because it was a 64x64 image.

Edited by loverock125, 25 April 2012 - 08:35 PM.

[TheSnidr]

Or you can use transformations:

d3d_transform_set_rotation_z(image_angle)
d3d_transform_add_scaling(image_xscale, image_yscale, 0)
d3d_transform_add_translation(x, y, 0)
draw_sprite_ext(sprite_index, 0, 0, 0, 1, 1, 0, image_blend, image_alpha)
d3d_transform_set_identity()

Not tested, but I believe it should work. You do not have to start 3D mode to use transformation functions. The first one rotates the image, the second one scales it, and the third one moves it to the correct coordinates.

Worked perfectly, thanks a bunch! Thats a neat little trick using D3D functions for 2D.

I tried this before posting and it has the same result as draw_sprite_ext. Maybe I couldn't notice any difference on the texture because it was a 64x64 image.

You probably scaled it first, then rotated it. That would produce the same result as just using draw_sprite_ext