func display() { gl.Clear(gl.COLOR_BUFFER_BIT) bitmap_output(40, 35, "This is written in a GLUT bitmap font.", glut.BITMAP_TIMES_ROMAN_24) bitmap_output(30, 210, "More bitmap text is a fixed 9 by 15 font.", glut.BITMAP_9_BY_15) bitmap_output(70, 240, " Helvetica is yet another bitmap font.", glut.BITMAP_HELVETICA_18) gl.MatrixMode(gl.PROJECTION) gl.PushMatrix() gl.LoadIdentity() glu.Perspective(40.0, 1.0, 0.1, 20.0) gl.MatrixMode(gl.MODELVIEW) gl.PushMatrix() // Banthar's glu doesn't have this right now. // glu.LookAt(0.0, 0.0, 4.0, /* eye is at (0,0,30) */ // 0.0, 0.0, 0.0, /* center is at (0,0,0) */ // 0.0, 1.0, 0.) /* up is in postivie Y direction */ gl.PushMatrix() gl.Translatef(0, 0, -4) gl.Rotatef(50, 0, 1, 0) stroke_output(-2.5, 1.1, " This is written in a", glut.STROKE_ROMAN) stroke_output(-2.5, 0, " GLUT stroke font.", glut.STROKE_ROMAN) stroke_output(-2.5, -1.1, "using 3D perspective.", glut.STROKE_ROMAN) gl.PopMatrix() gl.MatrixMode(gl.MODELVIEW) gl.PopMatrix() gl.MatrixMode(gl.PROJECTION) gl.PopMatrix() gl.MatrixMode(gl.MODELVIEW) gl.Flush() }
func display() { gl.Clear(gl.COLOR_BUFFER_BIT) gl.Begin(gl.TRIANGLES) gl.Color3f(0.0, 0.0, 1.0) /* blue */ gl.Vertex2i(0, 0) gl.Color3f(0.0, 1.0, 0.0) /* green */ gl.Vertex2i(200, 200) gl.Color3f(1.0, 0.0, 0.0) /* red */ gl.Vertex2i(20, 200) gl.End() gl.Flush() /* Single buffered, so needs a flush. */ }
func display() { gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) gl.LineWidth(1) gc := draw2dgl.NewGraphicContext(width, height) gc.Translate(380, 400) gc.Scale(1, -1) rotate = (rotate + 1) % 360 gc.Rotate(float64(rotate) * math.Pi / 180) gc.Translate(-380, -400) interpreter := postscript.NewInterpreter(gc) reader := strings.NewReader(postscriptContent) lastTime := time.Now() interpreter.Execute(reader) dt := time.Now().Sub(lastTime) log.Printf("Redraw in : %f ms\n", float64(dt)*1e-6) gl.Flush() /* Single buffered, so needs a flush. */ glut.PostRedisplay() }