2D Drawing in FLTK

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Transformation matrix The complex drawing shapes use a transformmatrix to determine where they are drawn Coordinate system need not be tiedto screen pixels e.g., create object with dimensions 1.0x1.0, andhave it scale to fill the widget Matrix stack: a way to save/restore currenttransform matrix● fl_push_matrix(); // save old matrix● fl_pop_matrix(); // restore old matrixCMPT166: FLTK drawing 20 Feb 200910
Combining transformations fl_scale( float x, y=1 ); fl_translate( float x, y ); fl_rotate( float degrees ); Multiplies another transformationinto the current transform matrix Operations are done in reverse order: fl_rotate( 30. ); fl_translate( 100., 0. ); fl_begin_polygon(); .....● Translate is done first, then rotate!CMPT166: FLTK drawing 20 Feb 200911
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2D Drawing in FLTK

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